JPH0227284B2 - - Google Patents
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- Publication number
- JPH0227284B2 JPH0227284B2 JP58148023A JP14802383A JPH0227284B2 JP H0227284 B2 JPH0227284 B2 JP H0227284B2 JP 58148023 A JP58148023 A JP 58148023A JP 14802383 A JP14802383 A JP 14802383A JP H0227284 B2 JPH0227284 B2 JP H0227284B2
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- Prior art keywords
- magnesia
- aggregate
- single crystal
- seawater
- less
- 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 - Lifetime
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- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Compositions Of Oxide Ceramics (AREA)
Description
本発明は、耐火材料に供する海水マグネシア集
合物に関するものである。
マグネシアは主に製鋼炉、電炉、セメントキル
ン等の耐火材料として使用されており、従来より
耐火物材料に供する海水マグネシア集合物（粉）
はマグネシアクリンカーを機械的に粉砕するか、
マグネシアクリンカー製造時発生する微粒子を分
級、もしくは機械的に粉砕して製造している。
しかしこのような方法で製造されるマグネシア
集合物の化学組成及び粒界鉱物組成は該集合物原
料であるマグネシアクリンカーとなんら変ること
なく、海水マグネシア特有のボロンやカルシウム
シリケートが粒界もしくは表面に存在するマグネ
シア集合物であり、より高純度な耐火物材料への
要求に応ぜられるものではない。またボロン含有
量が極めて少なく且つカルシウムシリケート相の
ない海水マグネシアは精製した海水もしくはカン
水と苛性ソーダを反応せしめてつくつた水酸化マ
グネシウムや塩化マグネシウムを熱分解してつく
つた軽焼マグネシアを焼成することにより製造で
きる。このようにしてつくつたマグネシアクリン
カーを粉砕すればボロン、カルシウムシリケート
相のないマグネシア集合物（粉）がつくられる
が、この方法でつくつたマグネシア集合物は表面
に劈開が多く且つ水との反応性が大きいという欠
点を持つ。
本発明は海水マグネシア特有のボロン及びカル
シウムシリケート相が存在しない、もしくは非常
に少なく且つ特定の形状をした海水マグネシア集
合物を見出したものであり、本発明の海水マグネ
シア集合物を耐火物材料に使用すれば耐火物中の
ボロン、カルシウムシリケートが減少できるのは
勿論、耐火物製造時添加する水との反応（マグネ
シアの水和反応）が極力押えられる等の利点があ
る。
即ち本発明は、化学組成がMgO＝98wt％以
上、CaO＝1.0wt％以下、B2O3＝0.02wt％以下で
あり、表面にカルシウムシリケート相が存在しな
い単結晶海水マグネシア粒が重量比100〜20％と
単結晶が最大50個以下結合し合つた多結晶海水マ
グネシア粒が重量比０〜80％混合した耐水和性に
優れた海水マグネシア集合物である。
本発明におけるマグネシア集合物は高純度であ
り、純度を維持する点からCaOは1.0wt％以下で
なければならない。
本発明にかかるマグネシア集合物を構成するひ
とつひとつの粒子はすべて単結晶であることが望
ましいが、単結晶が結合し合つた多結晶粒子であ
つても多結晶粒子を構成する単結晶の数が最大50
個以下の多結晶粒子であれば良い。単結晶が50個
以上結合し合つた粒子ではボロン、カルシウムシ
リケート相の除去が困難になり、本発明の化学組
成、鉱物組成と異なつたマグネシア集合物とな
る。マグネシア集合物中に占める単結晶粒子の重
量比率は100〜20％である。単結晶粒子の重量比
率が20％未満ではMgO＝98wt％以上、CaO＝
1.0wt％以下、B2O3＝0.02wt％以下の化学組成を
維持することが困難であり、又維持ができても水
との反応性が大きなマグネシア集合物になる。
本発明におけるマグネシア集合物の化学組成測
定はMgOwt％については、重量パーセント（wt
％）表示したCaO、SiO2、Fe2O3、Al2O3、
B2O3、（ZrO2）、イグニシヨンロス（強熱減量）
の総和を100から引いた値とした。これは当業界
周知の方法である。CaOwt％の測定はNN指示薬
［１−（２−オキシ−４−スルホ−１−ナフチルア
ゾ）−２−オキシ−３−ナフトエ酸］による
EDTA［エチレンジアミン４酢酸２ナトリウム
塩］滴定法で行なつた。又B2O3の含有率測定は
Ｄ−マンニトール添加PHメーター指示アルカリ滴
定法で行なつた。カルシウムシリケート相の存在
確認はＸ線マイクロアナライザーによるCa、Si
元素の定性的存在位置測定とＸ線回折法による鉱
物測定により行なつた。
本発明のマグネシア集合物のひとつひとつの粒
子形状は走査電子顕微鏡（SEM）による観察と
エポキシ樹脂に埋め込み研磨した該マグネシア集
合物の反射顕微鏡による観察で実施した。本発明
のマグネシア集合物の図を第１図乃至第４図に示
す。第１図は後述する実施例１のマグネシア集合
物の走査電子顕微鏡写真、第２図は同研磨品の反
射顕微鏡写真、第３図は実施例２のマグネシア集
合物の走査電子顕微鏡写真、第４図は同研磨品の
反射顕微鏡写真である。反射顕微鏡観察で１つの
粒子内に１つの結晶が観察される粒子は単結晶粒
子、１つの粒子内にｎ個（ｎ≧２）の単結晶が観
察される粒子はn1.5［（√）3］個の単結晶が結合
し合つた粒子とした。またマグネシア集合物中の
単結晶粒子の重量比率は任意の反射顕微鏡視野内
における単結晶粒子及び単結晶が結合し合つた粒
子ひとつひとつの最大粒径と最少粒径の中間値の
３乗の総和と単結晶粒子だけの最大粒径と最小粒
径の中間値の３乗の総和との比をもつて表示し
た。
本発明における化学組成、カルシウムシリケー
ト相の存在確認、マグネシア粒子の形状、単結晶
比率等の測定は上記方法をもつて実施したが、よ
り簡単且つ正確な測定方法があるならばその測定
方法を否定するものではない。
本発明のマグネシア集合物は、海水マグネシア
クリンカー製造時発生する直径0.3mm以下の粉を
酸性水溶液でごく短時間洗滌することにより得ら
れる。水との反応性が高いマグネシアを水もしく
は酸性水溶液で洗滌するという操作は当業界では
考えにくい操作であり且つ洗滌によりボロン、カ
ルシウムシリケート相が除去できた上に水との反
応性が比較的小さなマグネシア集合物がつくれる
ことは予想だにできなかつた事である。
本発明のマグネシア集合体は、MgOが98wt％
以上且つボロン含有量が少なくカルシウムシリケ
ート相が存在しない高純度マグネシア集合物であ
り且つ劈開面を有さず水との反応性が小さいとい
う特徴を持ち、耐火煉瓦、吹き付材等耐火物製造
原料に適しているのは勿論、従来海水マグネシア
には不適な用途とされていたシーズヒーターその
他フアインセラミツク分野への応用が考えられ
る。
以下、実施例並びに比較例について述べる。
実施例 １
ロータリーキルンで1900℃の温度で焼成した直
径0.3mm以下の海水マグネシアクリンカー粉250ｇ
を0.125N−HCl1に入れ５分間撹拌した後上澄
液を捨て、これに水１を加え撹拌した後ブフナ
ーロートで吸引濾過、ロート上で再度水洗した後
120℃熱風中で乾燥した。このマグネシア集合物
を化学分析した。
洗滌処理前のクリンカー粉と処理後の集合物の
化学組成を表１に示す。
The present invention relates to a seawater magnesia aggregate for use in refractory materials. Magnesia is mainly used as a refractory material in steelmaking furnaces, electric furnaces, cement kilns, etc., and has traditionally been used as a seawater magnesia aggregate (powder) for refractory materials.
mechanically crush the magnesia clinker, or
It is manufactured by classifying or mechanically crushing the fine particles generated during magnesia clinker manufacturing. However, the chemical composition and grain boundary mineral composition of the magnesia aggregate produced by this method are no different from the magnesia clinker that is the raw material for the aggregate, and boron and calcium silicate, which are unique to seawater magnesia, are present at grain boundaries or on the surface. It is a magnesia aggregate with high purity, and cannot meet the demand for higher purity refractory materials. In addition, seawater magnesia with extremely low boron content and no calcium silicate phase can be obtained by firing light calcined magnesia made by thermally decomposing magnesium hydroxide or magnesium chloride, which is made by reacting purified seawater or can water with caustic soda. It can be manufactured by If the magnesia clinker produced in this way is pulverized, a magnesia aggregate (powder) without boron and calcium silicate phases can be produced, but the magnesia aggregate produced by this method has many cleavages on the surface and is highly reactive with water. It has the disadvantage of being large. The present invention has discovered a seawater magnesia aggregate in which the boron and calcium silicate phases peculiar to seawater magnesia do not exist or are very small and have a specific shape, and the seawater magnesia aggregate of the present invention is used for refractory materials. This not only reduces the amount of boron and calcium silicate in the refractory, but also has the advantage of suppressing as much as possible the reaction with water added during the manufacture of the refractory (hydration reaction of magnesia). That is, in the present invention, single crystal seawater magnesia grains having a chemical composition of MgO = 98 wt% or more, CaO = 1.0 wt% or less, B 2 O 3 = 0.02 wt% or less, and no calcium silicate phase on the surface, have a weight ratio of 100%. It is a seawater magnesia aggregate with excellent hydration resistance, which has a weight ratio of 0 to 80% polycrystalline seawater magnesia grains with a maximum of 50 or less bonded single crystals. The magnesia aggregate in the present invention has high purity, and in order to maintain purity, CaO must be 1.0 wt% or less. It is desirable that each particle constituting the magnesia aggregate according to the present invention is a single crystal, but even if the single crystal is a polycrystalline particle in which single crystals are bonded together, the maximum number of single crystals constituting the polycrystalline particle is 50
It is sufficient if the number of polycrystalline particles is less than or equal to 1. In particles in which 50 or more single crystals are bonded together, it becomes difficult to remove the boron and calcium silicate phases, resulting in a magnesia aggregate having a chemical composition and mineral composition different from those of the present invention. The weight ratio of single crystal particles in the magnesia aggregate is 100 to 20%. If the weight ratio of single crystal particles is less than 20%, MgO = 98wt% or more, CaO =
It is difficult to maintain a chemical composition of 1.0 wt% or less and B 2 O 3 = 0.02 wt% or less, and even if it is possible to maintain it, magnesia aggregates become highly reactive with water. The chemical composition measurement of the magnesia aggregate in the present invention is based on the weight percent (wt
%) Displayed CaO, SiO 2 , Fe 2 O 3 , Al 2 O 3 ,
B 2 O 3 , (ZrO 2 ), ignition loss
The total sum was subtracted from 100. This is a method well known in the art. CaOwt% was measured using the NN indicator [1-(2-oxy-4-sulfo-1-naphthylazo)-2-oxy-3-naphthoic acid].
It was carried out by EDTA [ethylenediaminetetraacetic acid disodium salt] titration method. The B 2 O 3 content was measured by alkaline titration using a PH meter with the addition of D-mannitol. The presence of calcium silicate phase can be confirmed by measuring Ca and Si using an X-ray microanalyzer.
This was done by measuring the qualitative location of elements and mineralogy using X-ray diffraction. The shape of each particle of the magnesia aggregate of the present invention was observed using a scanning electron microscope (SEM), and the magnesia aggregate embedded in an epoxy resin and polished was observed using a reflection microscope. Diagrams of the magnesia aggregate of the present invention are shown in FIGS. 1 to 4. Fig. 1 is a scanning electron micrograph of the magnesia aggregate of Example 1, which will be described later; Fig. 2 is a reflection micrograph of the same polished product; Fig. 3 is a scanning electron micrograph of the magnesia aggregate of Example 2; The figure is a reflection micrograph of the same polished product. A particle in which one crystal is observed within one particle by reflection microscopy is a single crystal particle, and a particle in which n (n≧2) single crystals are observed within one particle is n 1.5 [(√) 3 ] single crystals bonded together. In addition, the weight ratio of single crystal particles in a magnesia aggregate is the sum of the cube of the median value of the maximum grain size and the minimum grain size of each single crystal grain and each particle in which single crystals are combined in an arbitrary reflection microscope field of view. It is expressed as the ratio between the maximum grain size of only single crystal grains and the sum of the cube of the median value of the minimum grain size. In the present invention, the chemical composition, confirmation of the presence of a calcium silicate phase, measurement of the shape of magnesia particles, single crystal ratio, etc. were carried out using the above methods, but if there is a simpler and more accurate measurement method, that measurement method is rejected. It's not something you do. The magnesia aggregate of the present invention is obtained by washing powder with a diameter of 0.3 mm or less generated during the production of seawater magnesia clinker with an acidic aqueous solution for a very short time. Washing magnesia, which has a high reactivity with water, with water or an acidic aqueous solution is an operation that is difficult to imagine in the industry, and in addition to being able to remove the boron and calcium silicate phases through washing, magnesia has a relatively low reactivity with water. The creation of magnesia aggregates was something we could not have predicted. The magnesia aggregate of the present invention contains 98wt% MgO.
It is a high-purity magnesia aggregate with a low boron content and no calcium silicate phase, and has the characteristics of having no cleavage plane and low reactivity with water, and is a raw material for manufacturing refractories such as firebricks and sprayed materials. It is of course suitable for use in seawater magnesia, but it can also be applied to sheathed heaters and other fine ceramic fields, which were conventionally considered unsuitable for seawater magnesia. Examples and comparative examples will be described below. Example 1 250g of seawater magnesia clinker powder with a diameter of 0.3mm or less baked at a temperature of 1900℃ in a rotary kiln
was added to 0.125N-HCl1, stirred for 5 minutes, the supernatant liquid was discarded, water was added to this, stirred, suction filtered with a Buchner funnel, and washed again with water on the funnel.
Dry in hot air at 120°C. This magnesia aggregate was chemically analyzed. Table 1 shows the chemical composition of the clinker powder before washing and the aggregate after washing.
【表】
実施例 ２
ロータリーキルンで2000℃の温度で焼成した直
径0.3mm以下の海水マグネシアクリンカー粉250ｇ
を0.20N−HCl1に入れ５分間撹拌した後上澄
液を捨て、これに水１を加え撹拌した後ブフナ
ーロートで吸引濾過、ロート上で再度水洗した
後、120℃熱風中で乾燥した。このマグネシア集
合物を化学分析した。洗滌処理前のクリンカー粉
と処理後の集合物の化学組成を表２に示す。[Table] Example 2 250g of seawater magnesia clinker powder with a diameter of 0.3mm or less baked at a temperature of 2000℃ in a rotary kiln
was added to 0.20N HCl1, stirred for 5 minutes, the supernatant liquid was discarded, water was added to this, stirred, filtered under suction using a Buchner funnel, washed again with water on the funnel, and dried in hot air at 120°C. This magnesia aggregate was chemically analyzed. Table 2 shows the chemical composition of the clinker powder before washing and the aggregate after washing.
【表】
試験例 １
実施例１の洗滌前粉、洗滌後マグネシアをエポ
キシ樹脂に埋め込みダイヤモンドペーストで研
磨、アセトン洗滌した試料を島津製作所製Ｘ線マ
イクロアナライザーで試料電流0.005μAの条件で
Ca、Si元素の粒子内存在位置を測定した。洗滌
前粉ではCaは大部分が表面及び粒界に存在し、
一部が単結晶粒内に存在することが確認できた。
又表面Siは粒界に存在しており単結晶粒内には存
在しないことが確認できた。これに対して洗浄処
理したマグネシア集合物ではCaは表面に検出で
きず単結晶粒内と粒界に検出できた、Siは表面、
粒内に検出できず、粒界に検出できた。
試験例 ２
実施例２の洗滌前粉、洗滌後マグネシアをエポ
キシ樹脂に埋め込みダイヤモンドペーストで研磨
した試料をＸ線マイクロアナライザーでCa、Si
元素の粒子内存在位置を測定した。洗滌前粉では
Caは大部分が表面及び粒界に存在し、一部が単
結晶粒子内に存在することができた。又Siは表面
粒界に存在しており単結晶粒内には存在してない
ことが確認できた。これに対して洗滌処理したマ
グネシア集合物ではCaは表面粒界、単結晶粒内
共存在しているものの表面に存在しているCaは
洗滌前よりはるかに少なくなつていた。Siは粒界
に検出できたものの、表面粒界内に検出できなか
つた。
試験例 ３
実施例１、２の洗滌前粉、洗滌後マグネシアを
乳鉢ですりつぶし理学電機製Ｘ線回折装置で管電
圧、流40KV、20mA、感度400cpsの条件で測定
した。検出された鉱物を表３に〇印で示す。[Table] Test Example 1 The pre-washed powder and washed magnesia of Example 1 were embedded in epoxy resin, polished with diamond paste, and washed with acetone, using a Shimadzu X-ray microanalyzer at a sample current of 0.005 μA.
The positions of Ca and Si elements in the particles were measured. In the powder before washing, most of Ca exists on the surface and grain boundaries.
It was confirmed that a part of it existed within single crystal grains.
It was also confirmed that surface Si exists at grain boundaries and not within single crystal grains. On the other hand, in the washed magnesia aggregate, Ca could not be detected on the surface, but could be detected inside the single crystal grains and at the grain boundaries.Si was detected on the surface,
It could not be detected inside the grains, but it could be detected at grain boundaries. Test Example 2 Samples prepared by embedding the powder before washing and magnesia after washing in Example 2 in epoxy resin and polishing with diamond paste were analyzed using an X-ray microanalyzer to detect Ca and Si.
The positions of elements within the particles were measured. In pre-washed powder
Ca was mostly present on the surface and grain boundaries, and some could be present within the single crystal grains. It was also confirmed that Si exists at the surface grain boundaries and not within the single crystal grains. On the other hand, in the washed magnesia aggregate, although Ca coexisted at the surface grain boundaries and within the single crystal grains, the amount of Ca present on the surface was much less than before washing. Although Si could be detected at grain boundaries, it could not be detected within surface grain boundaries. Test Example 3 The pre-washed powder and washed magnesia of Examples 1 and 2 were ground in a mortar and measured using an X-ray diffractometer manufactured by Rigaku Denki under conditions of tube voltage, current of 40 KV, 20 mA, and sensitivity of 400 cps. The detected minerals are shown in Table 3 with a circle.
【表】
試験例 ４
実施例１、２のマグネシア集合物をエポキシ樹
脂に埋め込みダイヤモンドペーストで研磨した試
料をオリンパス製反射顕微鏡で200倍の写真撮影
をした。写真の中で１つの粒子内に海水マグネシ
ア特有の丸い単結晶が１個ある粒子を単結晶粒
子、単結晶が２個以上ある粒子を単結晶が結合し
た粒子と見なし、各粒子ひとつづつの最大径と最
小径を測定し中間値をその粒子の直径と見なし、
各粒共同一密度の真円であると仮定して単結晶粒
と単結晶が結合しあつた粒の重量比率を算出し
た。
測定結果を表４に示す。[Table] Test Example 4 A sample obtained by embedding the magnesia aggregates of Examples 1 and 2 in epoxy resin and polishing with diamond paste was photographed at 200 times magnification using an Olympus reflection microscope. In the photo, particles with one round single crystal, which is unique to seawater magnesia, are considered single-crystal particles, and particles with two or more single crystals are considered to be particles with combined single crystals. Measure the diameter and minimum diameter and consider the intermediate value as the diameter of the particle,
Assuming that each grain is a perfect circle with uniform density, the weight ratio of single crystal grains and grains in which single crystals are combined was calculated. The measurement results are shown in Table 4.
【表】
試験例 ５
実施例１、２で洗浄したマグネシア集合物をビ
ーカーに入れオートクレーブ中水蒸気圧２Kg−Ｇ
（134℃）２時間水蒸気に接触させ該マグネシア集
合物の水和の程度を重量増加率で測定した。
その結果、実施例１のマグネシア集合物は重量
増加率4.25wt％、実施例２のマグネシア集合物は
重量増加率0.79wt％だつた。
比較例 １
MgO＝99.10wt％、CaO＝0.57wt％、B2O3＝
0.003wt％、SiO2＝0.11wt％なる化学組成でＸ線
回折でカルシウムシリケート相が検出できなかつ
たマグネシアクリンカーを本発明のマグネシア集
合物とほぼ同様の粒度に粉砕し、実施例７に従つ
て水和の程度を重量増加率で測定した。その結果
重量増加率は17.52wt％だつた。[Table] Test Example 5 Place the magnesia aggregates washed in Examples 1 and 2 into a beaker and heat the water vapor pressure in an autoclave to 2 kg-G.
The magnesia aggregate was brought into contact with water vapor for 2 hours at 134°C, and the degree of hydration of the magnesia aggregate was measured in terms of weight increase rate. As a result, the weight increase rate of the magnesia aggregate of Example 1 was 4.25 wt%, and the weight increase rate of the magnesia aggregate of Example 2 was 0.79 wt%. Comparative example 1 MgO=99.10wt%, CaO=0.57wt%, B 2 O 3 =
A magnesia clinker with a chemical composition of 0.003wt% and SiO 2 =0.11wt% and no calcium silicate phase detected by X-ray diffraction was ground to approximately the same particle size as the magnesia aggregate of the present invention, and was crushed according to Example 7. The degree of hydration was measured by weight gain. As a result, the weight increase rate was 17.52wt%.
第１図は、実施例１のマグネシア集合物の走査
電子顕微鏡写真、第２図は同研磨品の反射顕微鏡
写真、第３図は実施例２のマグネシア集合物の走
査電子顕微鏡写真、第４図は同研磨品の反射顕微
鏡写真とそれぞれ示す。
Fig. 1 is a scanning electron micrograph of the magnesia aggregate of Example 1, Fig. 2 is a reflection micrograph of the polished product, Fig. 3 is a scanning electron micrograph of the magnesia aggregate of Example 2, and Fig. 4 are a reflection microscope photograph of the same polished product.
Claims (1)
％以下、B2O3＝0.02wt％以下であり、表面にカ
ルシウムシリケート相が存在しない単結晶海水マ
グネシア粒が重量比100〜20％と、単結晶が最大
50個以下結合し合つた多結晶海水マグネシア粒が
重量比０〜80％混合した耐水和性に優れた海水マ
グネシア集合物。1 Chemical composition: MgO = 98wt% or more, CaO = 1.0wt
% or less, B 2 O 3 = 0.02wt% or less, and single crystal seawater magnesia grains with no calcium silicate phase on the surface have a weight ratio of 100 to 20%, and the single crystal is the largest.
A seawater magnesia aggregate with excellent hydration resistance, containing 0 to 80% by weight of polycrystalline seawater magnesia grains with 50 or less pieces bonded together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58148023A JPS6042272A (en) | 1983-08-15 | 1983-08-15 | Magnesia blend |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58148023A JPS6042272A (en) | 1983-08-15 | 1983-08-15 | Magnesia blend |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6042272A JPS6042272A (en) | 1985-03-06 |
| JPH0227284B2 true JPH0227284B2 (en) | 1990-06-15 |
Family
ID=15443375
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58148023A Granted JPS6042272A (en) | 1983-08-15 | 1983-08-15 | Magnesia blend |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6042272A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61214389A (en) * | 1985-03-19 | 1986-09-24 | タテホ化学工業株式会社 | Electric insulation filling material for sheathed heater |
| JPH01313359A (en) * | 1988-06-13 | 1989-12-18 | Kobe Steel Ltd | Magnesia-carbon brick |
| TW200613235A (en) * | 2004-06-04 | 2006-05-01 | Tateho Kagaku Kogyo Kk | Monocrystal oxide magnesium sintered body and fabricating method thereof and plasma display panel |
| JP4955916B2 (en) * | 2004-06-17 | 2012-06-20 | タテホ化学工業株式会社 | Single crystal magnesium oxide sintered body, method for producing the same, and protective film for plasma display panel |
| JP6507214B1 (en) | 2017-12-01 | 2019-04-24 | 宇部マテリアルズ株式会社 | MAGNESIUM OXIDE POWDER, METHOD FOR PRODUCING THE SAME, THERMAL CONDUCTIVE RESIN COMPOSITION, THERMAL CONDUCTIVE GREASE, AND THERMAL CONDUCTIVE PAINT |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS494160A (en) * | 1972-05-04 | 1974-01-14 |
-
1983
- 1983-08-15 JP JP58148023A patent/JPS6042272A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6042272A (en) | 1985-03-06 |
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