JPH0328157A - High corrosion-resistant carbon-containing refractory material using cr2o3 solid solution-type aggregate - Google Patents
High corrosion-resistant carbon-containing refractory material using cr2o3 solid solution-type aggregateInfo
- Publication number
- JPH0328157A JPH0328157A JP1161668A JP16166889A JPH0328157A JP H0328157 A JPH0328157 A JP H0328157A JP 1161668 A JP1161668 A JP 1161668A JP 16166889 A JP16166889 A JP 16166889A JP H0328157 A JPH0328157 A JP H0328157A
- Authority
- JP
- Japan
- Prior art keywords
- mgo
- solid solution
- clinker
- carbon
- weight
- 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.)
- Pending
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 33
- 239000011819 refractory material Substances 0.000 title claims abstract description 16
- 230000007797 corrosion Effects 0.000 title claims abstract description 13
- 238000005260 corrosion Methods 0.000 title claims abstract description 13
- 239000007787 solid Substances 0.000 title description 2
- 239000006104 solid solution Substances 0.000 claims abstract description 20
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 6
- 239000010439 graphite Substances 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims description 21
- -1 graphite Chemical compound 0.000 claims 3
- 239000002893 slag Substances 0.000 abstract description 10
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 abstract description 9
- 238000002156 mixing Methods 0.000 abstract description 2
- 230000001590 oxidative effect Effects 0.000 abstract description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 4
- 229910052593 corundum Inorganic materials 0.000 abstract 4
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 4
- 230000000694 effects Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 238000003723 Smelting Methods 0.000 description 6
- 230000006866 deterioration Effects 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 238000007670 refining Methods 0.000 description 4
- 229910000805 Pig iron Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 102000006463 Talin Human genes 0.000 description 2
- 108010083809 Talin Proteins 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 230000003078 antioxidant effect Effects 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 241000238557 Decapoda Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229940078924 clean force Drugs 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、二次燃焼比率の高い転炉，混銑車，ステンレ
ス鋼溶製炉．溶融還元炉等の高温精錬炉の内張りに好適
に使用される炭素含有耐火物に関する。[Detailed Description of the Invention] [Industrial Field of Application] The present invention is applicable to converters with high secondary combustion ratios, pig iron mixers, and stainless steel smelting furnaces. The present invention relates to a carbon-containing refractory that is suitably used for lining high-temperature refining furnaces such as smelting reduction furnaces.
ＭｇＯあるいは＾１２０３を主或分とした炭素含有耐火
物は、優れた耐スポール性，耐スラグ侵食性を有してお
り、転炉，混跣車等の内張り材として家く使用されてい
る。Carbon-containing refractories mainly composed of MgO or ^1203 have excellent spall resistance and slag erosion resistance, and are commonly used as lining materials for converters, mixed cars, etc.
ところが、鉄鋼精錬に際しての混銑車における気酸処理
比率の上昇、転炉においてはＭ錬温度の上昇、二次燃焼
比率の上昇、さらには高二次燃焼比率を前提とした溶融
還元炉の出現によって、かかる炭素含有耐火物の使用条
件を著しく苛酷なものとしている。However, due to the increase in the gas-acid treatment ratio in the pig iron mixer during steel refining, the increase in the M refining temperature and the increase in the secondary combustion ratio in the converter, and the appearance of smelting reduction furnaces that assume a high secondary combustion ratio, The conditions under which such carbon-containing refractories are used are extremely severe.
このような条件下においては、炭素含有耐火物は高温で
スラグアタックを受けるために、耐火物中のＡｌ２０ｚ
クリンカー，ＭｇＯクリンヵーがスラグ中に速やかに溶
出して稼動表面に黒鉛等の炭素が常に露出した状態で使
用されることになり、このため、含有炭素の酸化が加速
し、耐火物の損傷速度は著しく増大する。Under such conditions, carbon-containing refractories undergo slag attack at high temperatures, so Al20z in the refractories
Clinker and MgO clinker are quickly eluted into the slag, and carbon such as graphite is constantly exposed on the operating surface. This accelerates the oxidation of the carbon contained and reduces the rate of damage to refractories. increases significantly.
この対策として、耐火物中に金属， ＳＩＣ． ８４Ｃ
，ガラス等の酸化防止剤を添加して黒鉛を酸化から保謹
する方法が採られている。As a countermeasure to this, metal, SIC. 84C
, a method has been adopted to protect graphite from oxidation by adding an antioxidant such as glass.
しかし、上記精錬炉においては炉内温度はｌ７００℃以
上に達し、この高温下においては、単に金属等の酸化防
止剤の増量等では脱炭反応層のスラグアタックによる溶
流と酸化は抑止し得ない。However, in the above-mentioned smelting furnace, the temperature inside the furnace reaches 1700℃ or more, and at this high temperature, simply increasing the amount of antioxidant such as metal cannot suppress the melt flow and oxidation due to slag attack in the decarburization reaction layer. do not have.
高温スラグに対する耐食性を高めるために、高純度電融
ＭｇＯ， Ａ１ｙＯｓクリンカーを使用して骨材を強
化すること、また、例えば特公昭５７−２３７６６号公
報に開示されているように、高温スラグアタックに対し
て安定な保護層を形戒することが提案されているが、未
だ充分な効果は得られていｆヨい。In order to increase the corrosion resistance against high-temperature slag, it is recommended to strengthen the aggregate using high-purity electrofused MgO, AlyOs clinker, and also to strengthen the aggregate against high-temperature slag attack, as disclosed in Japanese Patent Publication No. 57-23766, for example. Although it has been proposed to provide a stable protective layer for this purpose, sufficient effects have not yet been achieved.
本発明の目的は、このような高温度，酸化雰囲気条件下
においても、高温スラグアタックに対して安定であって
浸れた耐食性を有する炭素含有耐火物を得ることにある
。An object of the present invention is to obtain a carbon-containing refractory that is stable against high-temperature slag attack and has excellent corrosion resistance even under such high temperature and oxidizing atmosphere conditions.
本発明の高耐食性炭素含有耐火物は、Ｃｒ２０＊を０．
５重量％以上含有したＭｇＯまたはＡＪ，○，系炭素含
有耐火物において、ＣｒａｂｓをＭｇＯまたはＡｊ！２
０ｓタリンカー中に固溶させて配合せしめてなるもので
ある。The highly corrosion-resistant carbon-containing refractory of the present invention has a Cr20* of 0.
In MgO or AJ, ○, type carbon-containing refractories containing 5% by weight or more, Crabs is replaced with MgO or Aj! 2
It is formed by solid dissolving and blending it in 0s tarincar.
！ｇ○−Ｃ系の場合、Ｃｒ２０＋を０．５〜５重量％合
有するＣｒ２０＊固溶ＭｇＯクリンカーが、耐火物の粒
度構戊の中の０，２ｎ＋ｍ以上の粒度域の２０〜８５重
量％を占める。! In the case of g○-C system, Cr20* solid solution MgO clinker containing 0.5 to 5% by weight of Cr20+ accounts for 20 to 85% by weight of the particle size range of 0.2n+m or more in the particle size structure of the refractory. occupy
また、ｉ２０．−Ｃ系の場合は、ＣｒｚＣＬを０．５〜
１０重量％含有するＣｒ２０．固溶＾ｌ２０３クリンカ
ーが耐火物の粒度構戊の中の０．２ｍ以上の粒度域の２
０〜８５重量％を占める。Also, i20. -For C series, CrzCL is 0.5~
Cr20 containing 10% by weight. Solid solution ^l203 Clinker is in the particle size range of 0.2 m or more in the particle size structure of refractories.
It accounts for 0 to 85% by weight.
さらに、ｕｇ○−Ａｆ２ＯｓＣ系の場合は、ＣｒａＯ−
を０．５〜５重損％固溶したＭｇＯクリン力一とＣｒ２
０＊を０．５〜１０重量％固溶したＡｌｌ２０ｓタリン
カーとの合計が０．２ｍｍ以上の粒度域の２０〜８５重
量％を占める。Furthermore, in the case of ug○-Af2OsC system, CraO-
MgO and Cr2 with 0.5 to 5% heavy loss solid solution
The total amount including the All20s talin car in which 0.5 to 10% by weight of 0* is dissolved in solid solution accounts for 20 to 85% by weight of the particle size range of 0.2 mm or more.
ｌＪｇ○あるいは八ｊ２．ｏ３クリン力一へのＣｒ２０
＊の添加は、シリケートによる侵食性に対する抵抗性を
高める効果を有するものであるが、炭素含有耐大物にお
いては添加配合されたＣｒ２０ｓは、炭素によって還元
されて耐火物の組織劣化をもたらす。lJg○ or 8j2. Cr20 to o3 clean force one
The addition of * has the effect of increasing the resistance to erosion by silicates, but in carbon-containing large refractories, the added Cr20s is reduced by carbon and causes structural deterioration of the refractories.
しかしながら、炭素含有耐火物へＣｒ２Ｃ）＋を添加す
る際、配合されるＭｇＯまたは＾１２０３クリンカー中
に固溶させた状態でＣｒ２ｂｓを存在せしめておけば、
炭素による還元に起因する組織劣化は著しく軽減される
。However, when adding Cr2C)+ to carbon-containing refractories, if Cr2bs is present as a solid solution in MgO or ^1203 clinker,
Tissue deterioration due to carbon reduction is significantly reduced.
ＭｇＯクリン力一を使用する場合、Ｃｒ２０ａの！，Ｉ
ｇｏ中への固溶含有量が０．５重量％未満では耐食性の
向上効果が小さく、また、含有量が５重量％を超えると
、ＭｇＯクリンカー中への固溶限界を超えるので、粒界
にピクロクロマイトが析出し、れんが中の炭素と反応し
、これが組織劣化の原因となる。When using MgO Crine Power, Cr20a! ,I
If the solid solution content in MgO is less than 0.5% by weight, the effect of improving corrosion resistance will be small, and if the content exceeds 5% by weight, the solid solution limit in MgO clinker will be exceeded. Picrochromite precipitates and reacts with the carbon in the brick, causing structural deterioration.
また、使用される固溶クリンカーの粒度はその粒径が０
．２ｍｍ以上のものが２０重量％〜８５重量％を占める
一粒度構或のものである必要がある。In addition, the particle size of the solid solution clinker used is 0.
．． It is necessary to have a single particle size structure in which particles of 2 mm or more account for 20% to 85% by weight.
これは、クリンカー中のＣｒ２０ｓの含有量が５重量％
未渦の場合でも、使用するクリンカ一が微粉状態では炭
素との接触面積が増大して組織劣化を起こし易いためで
ある。しかし、耐火物の構或としてその存在の上限は８
５重量％である。これは、耐火物の粒度構或として、０
．２ｍＩｍ未満の微粉部が必要とされるＣｒｚＯｉを含
有したタリンカーの使用粒度域は上記の如＜０．２ｍｍ
以上であるが、耐火物を構或するためには０．２帥未満
の微粉部が必要とされるためである。This means that the content of Cr20s in the clinker is 5% by weight.
This is because even in the case of non-vortex, if the clinker used is in a fine powder state, the contact area with carbon increases and tissue deterioration is likely to occur. However, the upper limit of its existence as a refractory structure is 8
It is 5% by weight. This is 0 as the particle size structure of the refractory.
．． The particle size range for CrzOi-containing Talincar, which requires a fine powder part of less than 2 mIm, is <0.2 mm as described above.
As mentioned above, this is because a fine powder portion of less than 0.2 tons is required to construct a refractory.
八ＬＯ＊−ｃ系耐大物においては、＾Ｒｉ○，クリンカ
ー中のＣｒｚ○クは、０．５〜ｌＯ重量％に規制される
。＾１２０ｓ−Ｃｒ２０３系では連続固溶体を形戊し、
ＭｇＯより多量のＣｒ２０ｉが固溶されるが、１０重量
％を超えると、れんが中の炭素との反応により、組織劣
化を生じ、０．５重量％未満では効果が認められない。In 8LO*-c type heavy-duty materials, ^Ri○ and Crz○ in the clinker are regulated to 0.5 to 10% by weight. ^120s-Cr203 system forms a continuous solid solution,
A larger amount of Cr20i than MgO is dissolved in solid solution, but if it exceeds 10% by weight, structure deterioration occurs due to reaction with carbon in the brick, and if it is less than 0.5% by weight, no effect is observed.
使用粒度域は０．２１Ｉｌｆｆｉ以上、使用量は２０〜
８５重量％であるが、その理由はＭｇＯ−Ｃ系耐大物の
場合と同様である。The particle size range used is 0.21Ilffi or more, and the amount used is 20~
The amount is 85% by weight, and the reason is the same as in the case of MgO-C type large-sized materials.
本発明の耐火物は、上記構底物にカーボン系樹脂バイン
ダーを添加し、常温で混練或型後２００℃前後で加熱し
て得ることができる。The refractory of the present invention can be obtained by adding a carbon-based resin binder to the above structure, kneading or molding at room temperature, and then heating at around 200°C.
第１表と第２表は本発明の実施例における組成とその特
性を示す。Tables 1 and 2 show the compositions and properties of examples of the present invention.
第１表は使用したタリンカーの組戊を示すもので、Ａ−
Ｄは本発明の範囲内にあるＭｇＯタリン力一を示し、Ｅ
は比較例を示す。また、Ｆ−Ｊは本発明の範囲内にある
Ａｌ２０ｓクリンカーを示し、Ｋはその比較例を示す。Table 1 shows the configuration of the tallincar used.A-
D indicates MgO talin, which is within the scope of the present invention, and E
indicates a comparative example. Furthermore, F-J indicates an Al20s clinker within the scope of the present invention, and K indicates a comparative example thereof.
さらに、第２表は本発明の実施例を比較例と共に示すも
ので、使用したクリンカ一の粒度構戊と他の配合物の組
或を示す。Further, Table 2 shows examples of the present invention together with comparative examples, and shows the particle size structure of the clinker used and the composition of other formulations.
第２表から、本発明の場合には、高温下でも耐食性が向
上しており、更に幅広い塩基度範囲で使用することがで
き、スラグ組戊変動にも十分対応可能であることが判る
。From Table 2, it can be seen that in the case of the present invention, corrosion resistance is improved even under high temperatures, it can be used in a wider range of basicity, and it can sufficiently cope with fluctuations in slag composition.
本発明の炭素含有耐火物によって以下の効果を奏するこ
とができる。The carbon-containing refractory of the present invention can provide the following effects.
（１）高温炉の炉壁材として使用してもＣｒ２ｂ３が炭
素と反応することがなく、組織の劣化を生じない。(1) Even when used as a furnace wall material of a high-temperature furnace, Cr2b3 does not react with carbon and does not cause deterioration of the structure.
（２）高温活性スラグアタックに対して安定な保護層を
形威し、高純度電融Ｍｇ Ｏ 、＾１２０，クリンカー
を使用した耐火物よりも良好な耐食性を示す。(2) Forms a stable protective layer against high-temperature activated slag attack and exhibits better corrosion resistance than refractories using high-purity fused MgO,^120, clinker.
（３）更に、幅広い塩基度範囲で使用することができ、
スラグ組或変動にも対応できる。(3) Furthermore, it can be used in a wide basicity range,
It can also accommodate variations in slug composition.
（４）シたがって、１７００℃以上の高温精錬炉材．高
二次燃焼炉材として有望な材質であり、二次燃焼比率の
高い転炉，混銑車，ＳＵＳ溶製炉、溶融還元炉等に好適
に使用することができる。(4) Therefore, high-temperature refining furnace materials of 1700°C or higher. It is a promising material as a high secondary combustion furnace material, and can be suitably used in converters with high secondary combustion ratios, pig iron mixers, SUS smelting furnaces, smelting reduction furnaces, etc.
Claims (5)
＿３系炭素含有耐火物において、同Ｃｒ＿２Ｏ＿３をＭ
ｇＯまたはＡｌ＿２Ｏ＿３クリンカー中に固溶させて配
合せしめてなる高耐食性炭素含有耐火物。1. MgO or Al_2O containing Cr_2O_3
In _3-based carbon-containing refractories, the same Cr_2O_3 is M
A highly corrosion-resistant carbon-containing refractory compounded as a solid solution in gO or Al_2O_3 clinker.
３固溶クリンカーの粒度が、０．２ｍｍ以上の粒度域が
２０〜８５重量％を占める粒度構成を有する高耐食性炭
素含有耐火物。2. In the description of claim 1, the blended Cr_2O_
3. A highly corrosion-resistant carbon-containing refractory having a particle size structure in which the particle size of the solid solution clinker is 20 to 85% by weight in the particle size range of 0.2 mm or more.
し、残部がＭｇＯ，ＭｇＯ・Ａｌ＿２Ｏ＿３，Ａｌ＿２
Ｏ＿３の中の１種または２種以上と黒鉛等の炭素とから
なるＭｇＯ系炭素含有耐火物において、Ｃｒ＿２Ｏ＿３
を０．５〜５重量％固溶したＭｇＯクリンカー粒子の中
、０．２ｍｍ以上の粒度のものが２０〜８５重量％を占
める高耐食性炭素含有耐火物。3. Contains MgO clinker in which Cr_2O_3 is dissolved, the remainder is MgO, MgO・Al_2O_3, Al_2
In MgO-based carbon-containing refractories consisting of one or more types of O_3 and carbon such as graphite, Cr_2O_3
A highly corrosion-resistant carbon-containing refractory in which 20 to 85 weight % of MgO clinker particles with a particle size of 0.2 mm or more are dissolved in a solid solution of 0.5 to 5 weight %.
ーを含有し、残部がＭｇＯ，ＭｇＯ・Ａｌ＿２Ｏ＿３，
Ａｌ＿２Ｏ＿３の中の１種または２種以上と黒鉛等の炭
素とからなるＭｇＯ系炭素含有耐火物において、Ｃｒ＿
２Ｏ＿３を０．５〜１０重量％固溶したＡｌ＿２Ｏ＿３
クリンカー粒子の中、０．２ｍｍ以上の粒度のものが２
０〜８５重量％を占める高耐食性炭素含有耐火物。4. Contains Al_2O_3 clinker in which Cr_2O_3 is dissolved, the remainder is MgO, MgO・Al_2O_3,
In MgO-based carbon-containing refractories consisting of one or more types of Al_2O_3 and carbon such as graphite, Cr_
Al_2O_3 with 0.5 to 10% by weight of 2O_3 in solid solution
Among clinker particles, those with a particle size of 0.2 mm or more are 2
A highly corrosion-resistant carbon-containing refractory that accounts for 0 to 85% by weight.
＿２Ｏ＿３を０．５〜１０重量％固溶したＡｌ＿２Ｏ＿
３クリンカーとを含有し、残部がＭｇＯ，ＭｇＯ・Ａｌ
＿２Ｏ＿３，Ａｌ＿２Ｏ＿３の中の１種または２種以上
と黒鉛等の炭素とからなるＭｇＯ系炭素含有耐火物にお
いて、Ｃｒ＿２Ｏ＿３を０．５〜５重量％固溶したＭｇ
Ｏクリンカー粒子とＣｒ＿２Ｏ＿３を０．５〜１０重量
％固溶したＡｌ＿２Ｏ＿３クリンカーの中、０．２ｍｍ
以上の粒度のものが２０〜８５重量％を占める高耐食性
炭素含有耐火物。5. MgO clinker with solid solution of Cr_2O_3 and Cr
Al_2O_ with 0.5 to 10% by weight of _2O_3 dissolved in solid solution
3 clinker, and the remainder is MgO, MgO・Al
MgO-based carbon-containing refractory consisting of one or more of _2O_3, Al_2O_3 and carbon such as graphite, with 0.5 to 5% by weight of Cr_2O_3 dissolved in Mg
0.2 mm in Al_2O_3 clinker in which O clinker particles and Cr_2O_3 are dissolved in a solid solution of 0.5 to 10% by weight.
A highly corrosion-resistant carbon-containing refractory whose particle size is 20 to 85% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1161668A JPH0328157A (en) | 1989-06-22 | 1989-06-22 | High corrosion-resistant carbon-containing refractory material using cr2o3 solid solution-type aggregate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1161668A JPH0328157A (en) | 1989-06-22 | 1989-06-22 | High corrosion-resistant carbon-containing refractory material using cr2o3 solid solution-type aggregate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0328157A true JPH0328157A (en) | 1991-02-06 |
Family
ID=15739569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1161668A Pending JPH0328157A (en) | 1989-06-22 | 1989-06-22 | High corrosion-resistant carbon-containing refractory material using cr2o3 solid solution-type aggregate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0328157A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5294310A (en) * | 1976-02-04 | 1977-08-08 | Harima Refractories Co Ltd | Magnesiaachromium oxide burned refractories stable under conditions of high temperature* especially high temperature and reduction atomosphere |
| JPS5491509A (en) * | 1977-12-21 | 1979-07-20 | Combustion Eng | High aluminaachromia base composition for heat resistant plastic |
-
1989
- 1989-06-22 JP JP1161668A patent/JPH0328157A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5294310A (en) * | 1976-02-04 | 1977-08-08 | Harima Refractories Co Ltd | Magnesiaachromium oxide burned refractories stable under conditions of high temperature* especially high temperature and reduction atomosphere |
| JPS5491509A (en) * | 1977-12-21 | 1979-07-20 | Combustion Eng | High aluminaachromia base composition for heat resistant plastic |
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