JPS6360000B2 - - Google Patents
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- Publication number
- JPS6360000B2 JPS6360000B2 JP12332084A JP12332084A JPS6360000B2 JP S6360000 B2 JPS6360000 B2 JP S6360000B2 JP 12332084 A JP12332084 A JP 12332084A JP 12332084 A JP12332084 A JP 12332084A JP S6360000 B2 JPS6360000 B2 JP S6360000B2
- Authority
- JP
- Japan
- Prior art keywords
- sintered body
- sio
- oxide
- sintered
- coated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- 239000000203 mixture Substances 0.000 claims description 24
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 19
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 18
- 229910018068 Li 2 O Inorganic materials 0.000 claims description 17
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000011521 glass Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000001590 oxidative effect Effects 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 description 19
- 238000007254 oxidation reaction Methods 0.000 description 19
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 229910000174 eucryptite Inorganic materials 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 229910013553 LiNO Inorganic materials 0.000 description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 description 3
- 229910052581 Si3N4 Inorganic materials 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 description 2
- IIPYXGDZVMZOAP-UHFFFAOYSA-N lithium nitrate Chemical compound [Li+].[O-][N+]([O-])=O IIPYXGDZVMZOAP-UHFFFAOYSA-N 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Inorganic materials [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 2
- 239000002195 soluble material Substances 0.000 description 2
- 239000012756 surface treatment agent Substances 0.000 description 2
- -1 A-S-L system Chemical compound 0.000 description 1
- 229910018626 Al(OH) Inorganic materials 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000008119 colloidal silica Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000002198 insoluble material Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
Description
〔発明の利用分野〕
本発明は表面被覆非酸化物系焼結体及びその製
造方法に係り、特に耐酸化性を向上した表面被覆
非酸化物系焼結体及びその製造方法に関する。
〔発明の背景〕
近年、非酸化物系フアインセラミツクス材料で
ある窒化珪素（Si3N4）、炭化珪素（SiC）、サイ
アロン（Sialon）等が注目を集めているが、これ
らを高温構造材料として使用する場合、その酸化
腐食が重要な問題点となつてきている。この問題
を解決するために、米国特許第3811929号により
ボロン添加表面処理“Silicon nitride ceramics”
が提案され、また公開特許公報昭和58年第95679
号によりFe、Cr、Co、Ni、Cuの酸化物とSiO2
系よりなる被覆をした“表面被覆反応焼結窒化珪
素とその製造法”が提案されているが、いずれも
気孔の多い反応焼結Si3N4に対する耐酸化性の改
良に関するものであり、その他の非酸化物系焼結
体に対する耐酸化性の向上については何ら検討さ
れていなかつた。
〔発明の目的〕
本発明は上記実状に鑑みてなされたものであ
り、その目的とするところは、各種の非酸化物系
焼結体の耐酸化性を向上させる表面被覆非酸化物
系焼結体及びその製造方法を提供することにあ
る。
〔発明の構成及び作用〕
本発明は、
非酸化物系焼結体の表面の少くとも一部を
Al2O3−SiO2−Li2O系よりなる組成物で被覆した
ことを特徴とする表面被覆非酸化物系焼結体、
及び
非酸化物系焼結体表面にAl2O3−SiO2−Li2O系
よりなる組成物をコーテイングした後酸化性雰囲
気下1000℃以上で加熱処理することにより該焼結
体表面にガラス相を形成することを特徴とする表
面被覆非酸化物系焼結体の製造方法、
を要旨とするものである。
即ち非酸化物系焼結体のうち反応焼結Si3N4は
一般に添加物を用いずに反応焼結されるため、高
温におけるクリープ特性に優れているものの焼結
体内部に15〜25％の連続気孔が存在し酸化が焼結
体の表面と内部とから同時に進行する。一方常圧
焼結Si3N4、ホツトプレスSi3N4等の緻密なSi3N4
焼結体は連続気孔が殆どないものの、添加物を使
用して成形されるため添加物の種類によつては表
面を通しての酸素の拡散と第２層の低融点化によ
り1400℃以上での酸化が著しい。また、焼結体表
面の1300℃近傍の酸化処理により上記表面に
SiO2層を設ける方法もとられているが、この時
生じるSiO2はクリストバライトであり220℃でα
−β変態に伴う急激な体積変化でクラツクを生じ
るので実質的に耐酸化性を向上することはできな
い。また、酸化生成物と焼結体本体との熱膨張率
の違いによつてもクラツクが発生し、これにより
酸化が進行する。
これに対し、本発明は非酸化物系焼結体表面を
焼結体本体よりも熱膨張率の小さいAl2O3−SiO2
−Li2O系組成物で表面コーテイングするもので
ある。Al2O3−SiO2−Li2O系組成物はユークリプ
タイト（Li2O・Al2O3・2SiO2）近傍の組成を有
するため熱膨張率が非常に小さく、しかも1400℃
近傍の融点を有しかつガラス化し易い上に、温度
変化に伴う体積変化も極めて小さいため1600℃以
下の熱サイクルにおいてクラツクを発生させるこ
とのない安定なガラス層を形成する材料である。
本発明において、表面被覆非酸化物系焼結体の
製造方法としては、Al2O3−SiO2−Li2O系組成物
の溶液を作成し、この溶液中で非酸化物系焼結体
を大気中又は真空中で浸漬するか又はこの溶液を
塗布し、乾燥後1000℃以上、好ましくは1000℃以
上1500℃以下、で熱処理するか、あるいは使用条
件下で熱処理することにより、該焼結体表面にガ
ラス層の被覆層を形成させる方法等が用いられ
る。このような本発明の製造方法で特徴的なこと
はコーテイング層が低熱膨張性材料であるため体
積変化が少なく、また複雑異形形状の焼結体の表
面被覆も可能であることである。
Al2O3−SiO2−Li2O系の原料としては、Al2O3
源はAl（NO3）3，AlCl3，Al2O3、Al（OH）3（アル
ミナゾル、アルミナゲル等）などが、SiO2源は
SiO2と水酸基とを有するシリカゲルあるいはシ
リカゾル、Li2O源はAl2O3と同様LiNO3、LiCl、
Li2O等の使用が可能である。これらの原料粒度
は水溶性材料である場合には特に問わないが、水
不溶性材料である場合には粒径100μｍ以下、好
ましくは10μｍ以下が望ましい。
上記原料のうち最も好ましいAl2O3−SiO2−
Li2O系組成物原料として、Al（NO3）3（又はアル
ミナゾル）−SiO2ゾル−LiNO3の如き水溶性材料
ないしはゾル状混合物が挙げられるが、Al2O3−
SiO2−Li2O系の水不溶性泥奨物スラリーでも十
分使用可能である。
〔発明の実施例〕
以下に本発明を実施例により更に詳細に説明す
るが、本発明はその要旨を超えない限り、以下の
実施例に限定されるものではない。
なお下記実施例において
Al2O3→Ａ
SiO2→Ｓ
Li2O→Ｌ
とそれぞれ略記する。
実施例 １
アルミナゾル、コロイダルシリカ、硝酸リチウ
ムを用いてＡ−Ｓ−Ｌ系、Ａ−Ｓ系、Ｓ−Ｌ系、
Ａ−Ｌ系組成物の各種溶液を作成した。Ａ−Ｓ−
Ｌ系組成物としては18A−Ｓ−Ｌ、Ａ−18S−Ｌ、
Ａ−Ｓ−18L、Ａ−2S−Ｌの４組成、Ａ−Ｓ系の
組成物としてはＡ−Ｓ、Ｓ−Ｌ系の組成物として
はＳ−Ｌ、Ａ−Ｌ系の組成物としてはＡ−Ｌの組
成の溶液ないしはゾル状の液体（以下「溶液」と
いう。）をそれぞれ作成した。
この溶液を蒸発乾固させ、得られる粉末を電気
炉にて1000℃、1250℃、1500℃で各々30分保持し
た後、放冷Ｘ線回折による相の同定を行なつた。
その結果、第１表の如くＡ−Ｓ−Ｌ系の３元素系
のものはすべてガラス、ユークリツプタイト又は
Ａ−Ｓ−Ｌ系の低熱膨張性鉱物相を生じ、表面処
理剤として適しており、一方Ａ−Ｓ系、Ｓ−Ｌ
系、Ａ−Ｌ系の２元素系のものは生成相から判断
して表面処理剤として不的確であることが判明し
た。
[Field of Application of the Invention] The present invention relates to a surface-coated non-oxide sintered body and a method for manufacturing the same, and more particularly to a surface-coated non-oxide sintered body with improved oxidation resistance and a method for manufacturing the same. [Background of the Invention] In recent years, non-oxide fine ceramic materials such as silicon nitride (Si 3 N 4 ), silicon carbide (SiC), and Sialon have attracted attention. oxidation corrosion has become an important problem when used as To solve this problem, boron-doped surface treatment “Silicon nitride ceramics” was proposed in US Pat. No. 3,811,929
was proposed and also published in the published patent publication No. 95679 of 1982.
Oxides of Fe, Cr, Co, Ni, Cu and SiO 2
``Surface-coated reaction sintered silicon nitride and its manufacturing method'' have been proposed, but these are all related to improving the oxidation resistance of reaction sintered Si 3 N 4 , which has many pores. No study has been made on improving the oxidation resistance of non-oxide-based sintered bodies. [Object of the Invention] The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide a surface-coated non-oxide sintered body that improves the oxidation resistance of various non-oxide-based sintered bodies. The object of the present invention is to provide a body and a method for producing the same. [Structure and operation of the invention] The present invention provides at least a portion of the surface of a non-oxide sintered body.
A surface-coated non-oxide sintered body characterized by being coated with a composition consisting of Al 2 O 3 −SiO 2 −Li 2 O, and a surface coated non-oxide sintered body with Al 2 O 3 −SiO on the surface of the non-oxide sintered body. A surface-coated non-oxide sintered body characterized in that a glass phase is formed on the surface of the sintered body by coating the sintered body with a composition consisting of 2 -Li 2 O and then heating it at 1000°C or higher in an oxidizing atmosphere. The gist is a method for producing a solid. In other words, among non-oxide-based sintered bodies, reaction-sintered Si 3 N 4 is generally reaction-sintered without using additives, so although it has excellent creep properties at high temperatures, it contains 15 to 25% of Si 3 N 4 inside the sintered body. Continuous pores exist, and oxidation proceeds simultaneously from the surface and inside of the sintered body. On the other hand, dense Si 3 N 4 such as pressureless sintered Si 3 N 4 and hot pressed Si 3 N 4
Although the sintered body has almost no continuous pores, it is molded using additives, so depending on the type of additive, it may be oxidized at temperatures above 1400℃ due to oxygen diffusion through the surface and the lower melting point of the second layer. is remarkable. In addition, by oxidizing the surface of the sintered body at around 1300℃, the above surface becomes
A method of providing two layers of SiO has also been taken, but the SiO 2 produced at this time is cristobalite, and α at 220℃
- Since cracks occur due to rapid volume changes accompanying β-transformation, oxidation resistance cannot be substantially improved. Cracks also occur due to the difference in thermal expansion coefficient between the oxidation product and the sintered body, and this causes the oxidation to proceed. In contrast, in the present invention, the surface of the non-oxide sintered body is made of Al 2 O 3 −SiO 2 which has a smaller coefficient of thermal expansion than the sintered body.
-The surface is coated with a Li 2 O-based composition. Since the Al 2 O 3 −SiO 2 −Li 2 O-based composition has a composition close to eucryptite (Li 2 O・Al 2 O 3・2SiO 2 ), its coefficient of thermal expansion is extremely small, and it can be heated at 1400°C.
It is a material that forms a stable glass layer that does not cause cracks during thermal cycles of 1600°C or less because it has a melting point in the vicinity and is easily vitrified, and its volume change due to temperature changes is extremely small. In the present invention, as a method for manufacturing a surface-coated non-oxide sintered body, a solution of an Al 2 O 3 -SiO 2 -Li 2 O-based composition is prepared, and the non-oxide sintered body is prepared in this solution. The sintered material can be sintered by immersing it in air or vacuum, or by applying this solution, and after drying, heat-treating it at 1000°C or higher, preferably 1000°C or higher and 1500°C or lower, or by heat-treating it under the conditions of use. A method such as forming a glass layer coating on the body surface is used. The manufacturing method of the present invention is characterized in that since the coating layer is made of a material with low thermal expansion, there is little change in volume, and it is also possible to coat the surface of a sintered body having a complex irregular shape. Al 2 O 3 −SiO 2 −Li 2 O-based raw materials include Al 2 O 3
Sources include Al(NO 3 ) 3 , AlCl 3 , Al 2 O 3 , Al(OH) 3 (alumina sol, alumina gel, etc.), but SiO 2 sources include
Silica gel or silica sol containing SiO 2 and hydroxyl groups, Li 2 O source is LiNO 3 , LiCl, as well as Al 2 O 3
It is possible to use Li 2 O, etc. The particle size of these raw materials is not particularly limited in the case of water-soluble materials, but in the case of water-insoluble materials, the particle size is desirably 100 μm or less, preferably 10 μm or less. The most preferred Al 2 O 3 −SiO 2 − among the above raw materials
Examples of raw materials for Li 2 O-based compositions include water-soluble materials or sol-like mixtures such as Al(NO 3 ) 3 (or alumina sol) - SiO 2 sol - LiNO 3 , but Al 2 O 3 -
A water-insoluble slurry based on SiO 2 −Li 2 O can also be used satisfactorily. [Examples of the Invention] The present invention will be explained in more detail by Examples below, but the present invention is not limited to the following Examples unless the gist of the invention is exceeded. In the following examples, each is abbreviated as Al 2 O 3 →A SiO 2 →S Li 2 O →L. Example 1 Using alumina sol, colloidal silica, and lithium nitrate, A-S-L system, A-S system, S-L system,
Various solutions of A-L compositions were prepared. A-S-
L-based compositions include 18A-S-L, A-18S-L,
4 compositions: A-S-18L and A-2S-L, A-S as an A-S composition, S-L as an S-L composition, and S-L as an A-L composition. Solutions or sol liquids (hereinafter referred to as "solutions") having the compositions A-L were prepared. This solution was evaporated to dryness, and the resulting powder was held in an electric furnace at 1000°C, 1250°C, and 1500°C for 30 minutes each, and then the phase was identified by cooling X-ray diffraction.
As a result, as shown in Table 1, all A-S-L three-element systems produce glass, eucryptite, or A-S-L mineral phases with low thermal expansion, making them suitable as surface treatment agents. , while A-S system, S-L
It has been found that two-element systems such as A and A-L are inappropriate as surface treatment agents, judging from the phases formed.
【表】
実施例 ２
実施例１で作成したＡ−Ｓ−Ｌ系のユークリプ
タイト（Ａ−2S−Ｌ）組成の溶液にバインダー
としてポリビニルアルコール（PVA）１％を添
加した溶液を作成した。この溶液にφ10×50
（mm）の反応焼結Si3N4を浸漬し、得られる表面
被覆焼結体に温度1000℃、1500℃、時間０〜100
時間で酸化テストを行なつた。同様にして表面を
被覆していない反応焼結Si3N4の酸化テストを行
なつた。その結果第１図（1000℃の場合）及び第
２図（1500℃の場合）に示すように、本発明によ
り表面コーテイングした焼結体（第１図及び第２
図の曲線１）の耐酸化性は表面コーテイングして
いない焼結体（同曲線２）に比較して著しく向上
していることが認められた。
実施例 ３
実施例２で作成したＡ−Ｓ−Ｌ系溶液（PVA
添加）にφ10×50（mm）の常圧焼結Si3N4を浸
漬した後、得られる表面被覆焼結体を温度1200℃
及び1400℃で100時間、酸化テストに供した。そ
の結果、1200℃でのテストでは常圧焼結Si3N4が
緻密質であるため表面被覆による差が認められな
かつたが、1400℃でのテストでは第２表の如く、
本発明により表面被覆処理を行なつたものは、処
理を行なわなかつたものに比較して明らかに耐酸
化性に差が認められた。[Table] Example 2 A solution was prepared by adding 1% polyvinyl alcohol (PVA) as a binder to the solution having the A-S-L type eucryptite (A-2S-L) composition prepared in Example 1. φ10×50 in this solution
(mm) of reactive sintered Si 3 N 4 was immersed into the resulting surface-coated sintered body at a temperature of 1000℃ and 1500℃ for a time of 0 to 100℃.
An oxidation test was carried out in time. Similarly, oxidation tests were conducted on reactively sintered Si 3 N 4 with no surface coating. As a result, as shown in Fig. 1 (in the case of 1000°C) and Fig. 2 (in the case of 1500°C), the sintered body with the surface coating according to the present invention (Fig.
It was observed that the oxidation resistance of curve 1) in the figure was significantly improved compared to the sintered body without surface coating (curve 2). Example 3 A-S-L solution prepared in Example 2 (PVA
After immersing a φ10×50 (mm) pressureless sintered Si 3 N 4 in
and subjected to an oxidation test at 1400°C for 100 hours. As a result, in the test at 1200℃, no difference due to surface coating was observed because pressureless sintered Si 3 N 4 was dense, but in the test at 1400℃, as shown in Table 2,
A clear difference in oxidation resistance was observed between those subjected to the surface coating treatment according to the present invention and those not subjected to the treatment.
【表】
実施例 ４
ユークリプタイト（Ａ−2S−Ｌ）組成物のＡ
源としてアルミナゾル（化合物）、Ｓ源として
SiO2粉末（粒径10μm以下、純度99％）、Ｌ源と
してLiNO3を用い、Ａ−Ｓ−Ｌ系組成物のスラ
リー（組成Ａ−2S−Ｌ）を作成した。
このスラリーにφ10×50の反応焼結Si3N4を
浸漬し、常温乾燥後1500℃、２時間で熱処理した
後、1500℃、100時間の大気中酸化テストを行な
つた。その結果、第３表に示すように溶液状組成
物と同様スラリーでも、表面コーテイングした焼
結体の耐酸化性の著しい向上が認められた。[Table] Example 4 Eucryptite (A-2S-L) composition A
Alumina sol (compound) as a source, S source
A slurry of an A-S-L composition (composition A-2S-L) was prepared using SiO 2 powder (particle size 10 μm or less, purity 99%) and LiNO 3 as an L source. Reactive sintered Si 3 N 4 of φ10×50 was immersed in this slurry, dried at room temperature, heat treated at 1500°C for 2 hours, and then subjected to an oxidation test in the air at 1500°C for 100 hours. As a result, as shown in Table 3, the oxidation resistance of the surface-coated sintered body was significantly improved with the slurry as well as with the solution composition.
以上詳述した通り、本発明によりAl2O3−SiO2
−Li2O系組成物を非酸化物系焼結体に被覆処理
した焼結体は、表面に緻密で低熱膨張性のガラス
層が形成されるため、表面からの酸素の拡散も少
なく極めて耐酸化性に優れる。しかも多孔質な反
応焼結体のみでなく添加物を使用した緻密質
Si3N4についても1400℃以上の高温において優れ
た耐酸化性を付与することができる。
As detailed above, according to the present invention, Al 2 O 3 −SiO 2
-Sintered bodies made by coating non-oxide sintered bodies with Li 2 O-based compositions form a dense, low-thermal-expansion glass layer on their surfaces, so they have minimal oxygen diffusion from the surface and are extremely acid-resistant. Excellent chemical properties. Moreover, it is not only a porous reaction sintered body, but also a dense one using additives.
Si 3 N 4 can also be provided with excellent oxidation resistance at high temperatures of 1400°C or higher.
第１図及び第２図はそれぞれ1000℃加熱及び
1500℃加熱による酸化テスト結果を示すグラフで
あり、横軸は加熱処理時間、縦軸は単位面積当り
の酸化増量を示す。
１……表面被覆処理品、２……未処理品。
Figures 1 and 2 show heating at 1000℃ and
This is a graph showing the results of an oxidation test by heating at 1500°C, where the horizontal axis shows the heat treatment time and the vertical axis shows the oxidation weight increase per unit area. 1...Surface coating treated product, 2...Untreated product.
Claims (1)
Al2O3−SiO2−Li2O系よりなる組成物で被覆した
ことを特徴とする表面被覆非酸化物系焼結体。 ２ Al2O3−SiO2−Li2O系組成物は熱処理により
非酸化物系焼結体の表面に融着されたAl2O3−
SiO2−Li2O系のガラス相であることを特徴とす
る特許請求の範囲第１項に記載の表面被覆非酸化
物系焼結体。 ３ 非酸化物系焼結体表面にAl2O3−SiO2−Li2O
系よりなる組成物をコーテイングした後酸化性雰
囲気下1000℃以上で加熱処理することにより該焼
結体表面にガラス相を形成することを特徴とする
表面被覆非酸化物系焼結体の製造方法。[Claims] 1. At least a part of the surface of the non-oxide sintered body
A surface-coated non-oxide sintered body characterized by being coated with a composition consisting of Al 2 O 3 −SiO 2 −Li 2 O system. 2 Al 2 O 3 −SiO 2 −Li 2 O-based composition is an Al 2 O 3 − fused to the surface of a non-oxide sintered body by heat treatment.
The surface-coated non-oxide-based sintered body according to claim 1, which has a SiO 2 -Li 2 O-based glass phase. 3 Al 2 O 3 −SiO 2 −Li 2 O on the surface of the non-oxide sintered body
A method for producing a surface-coated non-oxide sintered body, which comprises coating the sintered body with a composition consisting of the above-mentioned sintered body, and then heat-treating the body at 1000°C or higher in an oxidizing atmosphere to form a glass phase on the surface of the sintered body. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12332084A JPS616191A (en) | 1984-06-15 | 1984-06-15 | Surface coated non-oxide sintered body and manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12332084A JPS616191A (en) | 1984-06-15 | 1984-06-15 | Surface coated non-oxide sintered body and manufacture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS616191A JPS616191A (en) | 1986-01-11 |
| JPS6360000B2 true JPS6360000B2 (en) | 1988-11-22 |
Family
ID=14857634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12332084A Granted JPS616191A (en) | 1984-06-15 | 1984-06-15 | Surface coated non-oxide sintered body and manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS616191A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0665790B2 (en) * | 1986-09-19 | 1994-08-24 | 金井 宏之 | Steel code |
| CN105038336B (en) * | 2015-07-10 | 2017-06-30 | 佛山东鹏洁具股份有限公司 | A kind of inorganic nano paint and its preparation and application for being coated on substrate surface |
-
1984
- 1984-06-15 JP JP12332084A patent/JPS616191A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS616191A (en) | 1986-01-11 |
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