JP3787688B2 - Method for densifying chromia-magnesia brick - Google Patents
Method for densifying chromia-magnesia brick Download PDFInfo
- Publication number
- JP3787688B2 JP3787688B2 JP27280194A JP27280194A JP3787688B2 JP 3787688 B2 JP3787688 B2 JP 3787688B2 JP 27280194 A JP27280194 A JP 27280194A JP 27280194 A JP27280194 A JP 27280194A JP 3787688 B2 JP3787688 B2 JP 3787688B2
- Authority
- JP
- Japan
- Prior art keywords
- chromia
- magnesia
- densifying
- weight
- magnesia brick
- 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
- Compositions Of Oxide Ceramics (AREA)
Description
【0001】
【産業上の利用分野】
本願発明は、大気中で緻密化することにより各種窯炉の内張り材として特に耐食性に優れることを特徴とするクロミア−マグネシア質れんがの緻密化に関する。
【0002】
【従来の技術】
各種窯炉で使用される内張り材は残渣成分により浸食されるため、高クロミア含有の耐火材が使用されているのは公知の事実である。しかしながら高クロミア含有耐火材は大気中で焼成するとクロミアが昇華−凝縮機構により粒成長を起こし、緻密化焼結を困難にすることが知られており焼成に際しては雰囲気の調整やコークス中で焼成する等の処置がとられており、コスト高や歩留まりの低下を招いている。
【0003】
【発明が解決しようとする課題】
本発明は高クロミア含有耐火材,特にクロミア−マグネシア質の緻密化を大気中の焼成で可能にし、各種窯炉の内張り材を低コスト,高歩留まりを可能とするとともに高耐食性を有する材料を提供することを目的とする。
【0004】
【課題を解決するための手段】
本発明は、高クロミア含有耐火材,特にクロミア−マグネシア質れんがを大気中の焼成により緻密化を図り各種窯炉の内張り材として高耐食性の向上と低コスト,高歩留まりを可能とすることにある。上記の目的を達成するために本発明はクロミア−マグネシア耐火材に 40μ 以下の Cr2O3 1〜10重量%と Al2O3 0.5〜10重量%を添加することを特徴とする。
【0005】
【作用】
上記において、クロミア−マグネシア耐火材は電融品,焼結品のいずれでも使用できる。添加する Cr2O3 と Al2O3 は 40μ 以下が好ましい。40μ 以上のものは固溶反応が遅れることによりクロミアの結晶粒を生長させ緻密化ができず不適である。添加量は Cr2O3 1〜10重量%と Al2O3 0.5〜10重量%の範囲が好ましい。この範囲を外れると少ない場合は固溶量が少なすぎ緻密化が図れなかったり、多い場合は固溶速度が遅いため過剰となったものがスピネル相を生成し焼結を阻害し好ましくない。以上実施例により説明する。
【0006】
【実施例】
表1に示す配合物を混練し、230×114×65mm の形状に成形した後、トンネルキルンで 1780℃×14時間 焼成し、クロミア−マグネシア質れんがを得た。
【0007】
これらの物性を表1に示す。また、表2に浸食試験で使用した残渣成分の組成を示す。
【0008】
実施例1〜5と比較例1〜4からわかるように本発明のクロミア−マグネシア質れんがは緻密化が図れるとともに高耐食性を示し各種窯炉の内張り材として優れていることが判明した。
【0009】
【発明の効果】
上記の結果によりクロミア−マグネシア質れんがに 40μ 以下の Cr2O3 1〜10重量%と Al2O3 0.5〜10重量%を添加することにより緻密化が図れ耐食性の向上に結びつくとともに高歩留まりが可能となりコストダウンが計れることが判明した。
【表1】
【表2】
[0001]
[Industrial application fields]
The present invention relates to densification of chromia-magnesia brick, which is particularly excellent in corrosion resistance as a lining material for various kilns by being densified in the atmosphere.
[0002]
[Prior art]
Since lining materials used in various kilns are eroded by residual components, it is a known fact that refractory materials containing high chromia are used. However, refractory materials containing high chromia are known to cause grain growth due to sublimation-condensation mechanism when fired in the atmosphere, making it difficult to densify and sintering. Such measures are taken, leading to high costs and a decrease in yield.
[0003]
[Problems to be solved by the invention]
The present invention provides a high-chromia-containing refractory material, in particular, chromia-magnesia densification by firing in the atmosphere, and provides a material having high corrosion resistance as well as low cost and high yield for various kiln lining materials. The purpose is to do.
[0004]
[Means for Solving the Problems]
It is an object of the present invention to provide high chromia-containing refractory materials, particularly chromia-magnesia bricks, which are densified by firing in the air, and as a lining material for various kilns, it is possible to improve high corrosion resistance and to reduce costs and yield. . To accomplish the above object, chromia - characterized by addition of Cr 2 O 3 1 to 10 wt% and Al 2 O 3 0.5 to 10% by weight of 40μ to magnesia refractories.
[0005]
[Action]
In the above, the chromia-magnesia refractory material can be either an electromelted product or a sintered product. The added Cr 2 O 3 and Al 2 O 3 are preferably 40 μm or less. Those with a particle size of 40μ or more are unsuitable because the solid solution reaction is delayed and the chromia crystal grains grow and cannot be densified. The addition amount is preferably in the range of 1 to 10% by weight of Cr 2 O 3 and 0.5 to 10% by weight of Al 2 O 3 . If the amount is outside this range, the amount of the solid solution is too small to be densified, and if the amount is large, the solid solution rate is slow, so that an excessive amount forms a spinel phase and inhibits sintering, which is not preferable. The embodiment will be described above.
[0006]
【Example】
The compounds shown in Table 1 were kneaded and formed into a shape of 230 × 114 × 65 mm, and then fired in a tunnel kiln at 1780 ° C. for 14 hours to obtain a chromia-magnesia brick.
[0007]
These physical properties are shown in Table 1. Table 2 shows the composition of the residual components used in the erosion test.
[0008]
As can be seen from Examples 1 to 5 and Comparative Examples 1 to 4, it was found that the chromia-magnesia brick of the present invention can be densified and exhibits high corrosion resistance and is excellent as a lining material for various kilns.
[0009]
【The invention's effect】
Based on the above results, the addition of 1 to 10% by weight of Cr 2 O 3 and 10% by weight of Cr 2 O 3 and 0.5 to 10% by weight of Al 2 O 3 to chromia-magnesia bricks leads to improved corrosion resistance and high yield. It became possible to cut costs.
[Table 1]
[Table 2]
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27280194A JP3787688B2 (en) | 1994-10-12 | 1994-10-12 | Method for densifying chromia-magnesia brick |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27280194A JP3787688B2 (en) | 1994-10-12 | 1994-10-12 | Method for densifying chromia-magnesia brick |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH08109061A JPH08109061A (en) | 1996-04-30 |
JP3787688B2 true JP3787688B2 (en) | 2006-06-21 |
Family
ID=17518946
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP27280194A Expired - Fee Related JP3787688B2 (en) | 1994-10-12 | 1994-10-12 | Method for densifying chromia-magnesia brick |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3787688B2 (en) |
-
1994
- 1994-10-12 JP JP27280194A patent/JP3787688B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH08109061A (en) | 1996-04-30 |
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