JPH0635914B2 - Graphite crucible - Google Patents
Graphite crucibleInfo
- Publication number
- JPH0635914B2 JPH0635914B2 JP61055684A JP5568486A JPH0635914B2 JP H0635914 B2 JPH0635914 B2 JP H0635914B2 JP 61055684 A JP61055684 A JP 61055684A JP 5568486 A JP5568486 A JP 5568486A JP H0635914 B2 JPH0635914 B2 JP H0635914B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- parts
- graphite crucible
- silicon carbide
- aluminum
- 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 - Fee Related
Links
Landscapes
- Ceramic Products (AREA)
- Crucibles And Fluidized-Bed Furnaces (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明はアルミニウム、銅などの非鉄金属溶湯およびフ
ラックスに対して耐用性の高い黒鉛坩堝に関するもので
ある。Description: TECHNICAL FIELD The present invention relates to a graphite crucible having high durability against molten metal and flux of non-ferrous metals such as aluminum and copper.
（従来の技術） 従来、黒鉛坩堝は黒鉛、粘土からなるクレイボンド質
と、黒鉛、炭化珪素、珪素または珪素合金および低融無
機酸化物などの酸化防止剤に結合剤としてピッチ、ター
ル、フェノール樹脂などを配合したカーボンボンド質が
ある。(Prior Art) Conventionally, a graphite crucible has a clay bond material composed of graphite and clay and an antioxidant such as graphite, silicon carbide, silicon or silicon alloy and low melting inorganic oxide as a binder, pitch, tar and phenol resin. There is a carbon bond quality that mixes such as.
黒鉛坩堝はこれらの原料を混練し、成形し、還元性雰囲
気で焼成し、表面を酸化防止剤で被覆して製造したもの
であり、カーボンボンド質の方がクレイボンド質よりも
耐熱衝撃性および耐食性に優れている。しかしカーボン
ボンド質においてもアルミニウム合金などの溶解時に使
用するフラックスに対しては更に耐食性に優れることが
望まれている。アルミニウム合金等の溶解の際に使用す
る化学薬品は一般にフラックスと呼び、溶剤、融剤とも
いって融点が低い。フラックスは合金の脱ガス、酸化物
の除去、被覆による酸化防止、清浄、かす除去などを目
的として使用され、アルカリ金属やアルカリ土類金属の
ふっ素化合物、塩素化合物、炭酸塩、硝酸塩等を主成分
としているもので、融点の低い物質からなる（例えばふ
っ素化合物と塩素化合物を混合したものは520〜 780
℃）。そのため坩堝の素地内に浸透して、素地を変質し
侵食していく。A graphite crucible is produced by kneading these raw materials, molding, firing in a reducing atmosphere, and coating the surface with an antioxidant, and the carbon bond type has better thermal shock resistance and clay bond type than the clay bond type. It has excellent corrosion resistance. However, it is desired that the carbon bond quality is further excellent in corrosion resistance against the flux used for melting the aluminum alloy. The chemical used for melting aluminum alloys and the like is generally called flux, and has a low melting point also as a solvent and a flux. Flux is used for the purpose of degassing alloys, removing oxides, preventing oxidation by coating, cleaning, and removing dross, and mainly contains fluorine compounds of alkali metals and alkaline earth metals, chlorine compounds, carbonates, nitrates, etc. It consists of a substance with a low melting point (for example, a mixture of a fluorine compound and a chlorine compound is 520 to 780
C). Therefore, it permeates the inside of the crucible and changes the base to erode.
本発明は以上述べた従来の黒鉛坩堝を改善したものであ
る。The present invention is an improvement over the conventional graphite crucible described above.
（本発明の構成） 本発明は酸窒化アルミニウム３〜60重量部、炭素20〜70
重量部および炭化珪素３〜50重量部に残部が他の耐火性
物質からなることを特徴とする黒鉛坩堝である。(Structure of the present invention) The present invention comprises 3 to 60 parts by weight of aluminum oxynitride and 20 to 70 carbon.
A graphite crucible, characterized in that 3 parts by weight of silicon carbide and 3 to 50 parts by weight of silicon carbide and the remainder made of another refractory material.
次に本発明を構成する原料とその使用割合について説明
する。Next, the raw materials constituting the present invention and the ratio of use thereof will be described.
酸窒化アルミニウムは窒化アルミニウムとアルミナと固
溶体（ｍＡｌ2Ｏ3・ｎＡｌＮ）である。合成条件によっ
て酸窒化アルミニウム中に金属アルミニウム、アルミ
ナ、窒化アルミニウムが随伴することがある。酸窒化ア
ルミニウムは良好な耐火性、耐熱性の他に金属溶湯に対
して優れた耐食性を有するので、殊に還元性雰囲気中で
安定して使用できるのである。使用中に酸化したときは
Ａｌ2Ｏ3になる。Ａｌ2Ｏ3は炭化珪素が酸化したときに
生成するＳｉＯ2よりもフラックスに対する耐食性は優
れている。本発明は酸窒化アルミニウムを使用した黒鉛
坩堝は酸窒化アルミニウムの酸化前においても酸化後に
おいても耐フラックス性において従来の黒鉛坩堝を改善
したものが得られるという知見にもとづいてなされたも
のである。酸窒化アルミニウムの使用量は３〜60重量部
である。３重量部以下では、この原料を添加した効果が
あらわれず、また60重量部以上では他の構成原料の使用
料が不足するため、とくに耐熱衝撃性、耐酸化性、熱伝
導性等において満足なものが得られない。Aluminum oxynitride is aluminum nitride, alumina, and a solid solution (mAl 2 O 3 .nAlN). Depending on the synthesis conditions, aluminum oxynitride may be accompanied by metallic aluminum, alumina, and aluminum nitride. Since aluminum oxynitride has excellent fire resistance and heat resistance as well as excellent corrosion resistance against molten metal, it can be stably used especially in a reducing atmosphere. When oxidized during use, it becomes Al 2 O 3 . Al 2 O 3 has better corrosion resistance to flux than SiO 2 produced when silicon carbide is oxidized. The present invention was made based on the finding that a graphite crucible using aluminum oxynitride can improve the flux resistance of the conventional graphite crucible before and after the oxidation of aluminum oxynitride. The amount of aluminum oxynitride used is 3 to 60 parts by weight. If it is less than 3 parts by weight, the effect of adding this raw material does not appear, and if it exceeds 60 parts by weight, the usage fee of other constituent raw materials is insufficient. I can't get anything.
炭素は黒鉛坩堝に一般的に使用されている黒鉛を主原料
とし、結合剤の炭化によって生成される炭素も含まれ
る。炭素は20〜70重量部使用する。20重量部以下である
と、耐熱衝撃性、熱伝導性等が不足し、70重量部以上で
あると耐酸化性が不足する。Carbon mainly uses graphite generally used in a graphite crucible as a main raw material, and also includes carbon produced by carbonization of a binder. Use 20 to 70 parts by weight of carbon. When it is 20 parts by weight or less, thermal shock resistance and thermal conductivity are insufficient, and when it is 70 parts by weight or more, oxidation resistance is insufficient.
炭化珪素は、耐熱性、耐食性、耐熱衝撃性、耐酸化性お
よび強度の付与剤として使用する。炭化珪素の骨材は黒
鉛坩堝の骨格としての構造体の強度を保持する。炭化珪
素の微粉は急速な酸化によりシリカの保護膜を生成する
ので耐酸化性を付与させる。炭化珪素は３〜50重量部使
用する。３重量部以下であると上記諸性質が不足し、50
重量部以上であると耐熱衝撃性が不足する。Silicon carbide is used as a heat resistance, corrosion resistance, heat shock resistance, oxidation resistance and strength imparting agent. The silicon carbide aggregate retains the strength of the structure as the skeleton of the graphite crucible. The fine powder of silicon carbide gives a resistance to oxidation because it forms a protective film of silica by rapid oxidation. 3 to 50 parts by weight of silicon carbide is used. If the amount is less than 3 parts by weight, the above properties will be insufficient, and 50
If it is more than parts by weight, thermal shock resistance is insufficient.
以上の原料のほか、珪素または珪素合金、アルミニウム
粉末などの強度付与剤および酸化防止剤、炭化硼素や低
融無機酸化物などの酸化防止剤等を添加する。In addition to the above raw materials, a strength imparting agent such as silicon or silicon alloy, aluminum powder and an antioxidant, an antioxidant such as boron carbide and a low melting inorganic oxide, and the like are added.
次に本発明の実施例について説明する。Next, examples of the present invention will be described.
実施例１ 酸窒化アルミニウム19重量部、炭素29重量部、炭化珪素
32重量部、その他20重量部からなる組成の黒鉛坩堝（ 3
00番）を銅合金（ＢＣ−６）の溶解に使用した。従来品
が70回耐用に対して本発明品は84回耐用した。とくにフ
ラックス接触面の耐食性向上が耐用向上に寄与した。Example 1 19 parts by weight of aluminum oxynitride, 29 parts by weight of carbon, silicon carbide
A graphite crucible with a composition of 32 parts by weight and other 20 parts by weight (3
No. 00) was used for melting the copper alloy (BC-6). The product of the present invention has a durability of 84 times, while the conventional product has a durability of 70 times. Especially, the improvement of corrosion resistance of the flux contact surface contributed to the improvement of durability.
実施例２ 酸窒化アルミニウム41.5重量部、炭素35重量部、炭化珪
素 5.5重量部、その他18重量部からなる組成の黒鉛坩堝
（1000番）をアルミニウム合金（ＡＣ４Ｃ）の溶解に使
用した。従来品が 370時間耐用に対し本発明品は1180時
間耐用し著しく向上した。Example 2 A graphite crucible (No. 1000) having a composition of 41.5 parts by weight of aluminum oxynitride, 35 parts by weight of carbon, 5.5 parts by weight of silicon carbide and 18 parts by weight of others was used for melting an aluminum alloy (AC4C). The product of the present invention has a durability of 1180 hours, while the conventional product has a durability of 370 hours.
実施例３ 酸窒化アルミニウム25.5重量部、炭素30.1重量部、炭化
珪素25重量部、その他19.4重量部からなる組成の黒鉛坩
堝（1000番）をアルミニウム合金（ＡＣ４Ｂ）の溶解に
使用した。従来品が31.5日耐用であったのに対し本発明
品は70.3日耐用し著しく向上した。Example 3 A graphite crucible (No. 1000) having a composition of 25.5 parts by weight of aluminum oxynitride, 30.1 parts by weight of carbon, 25 parts by weight of silicon carbide and 19.4 parts by weight of others was used for melting an aluminum alloy (AC4B). The conventional product had a durability of 31.5 days, while the product of the present invention has a durability of 70.3 days, which is a marked improvement.
以上示した通り、本発明品は従来の黒鉛坩堝の欠点を改
善し耐用が著しく向上するので産業上有用な発明であ
る。As described above, the product of the present invention is an industrially useful invention because it improves the defects of the conventional graphite crucible and significantly improves the service life.
Claims (1)
〜70重量部および炭化珪素３〜50重量部に残部が他の耐
火性物質からなることを特徴とする黒鉛坩堝。1. Aluminum oxynitride 3 to 60 parts by weight, carbon 20
A graphite crucible characterized by comprising 70 to 70 parts by weight and 3 to 50 parts by weight of silicon carbide with the balance being other refractory material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61055684A JPH0635914B2 (en) | 1986-03-13 | 1986-03-13 | Graphite crucible |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61055684A JPH0635914B2 (en) | 1986-03-13 | 1986-03-13 | Graphite crucible |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62213683A JPS62213683A (en) | 1987-09-19 |
| JPH0635914B2 true JPH0635914B2 (en) | 1994-05-11 |
Family
ID=13005726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61055684A Expired - Fee Related JPH0635914B2 (en) | 1986-03-13 | 1986-03-13 | Graphite crucible |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0635914B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6223287B2 (en) * | 2014-06-17 | 2017-11-01 | 明智セラミックス株式会社 | Graphite crucible and manufacturing method thereof |
-
1986
- 1986-03-13 JP JP61055684A patent/JPH0635914B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62213683A (en) | 1987-09-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |