JP2989118B2 - Silicon iron nitride - Google Patents
Silicon iron nitrideInfo
- Publication number
- JP2989118B2 JP2989118B2 JP7123615A JP12361595A JP2989118B2 JP 2989118 B2 JP2989118 B2 JP 2989118B2 JP 7123615 A JP7123615 A JP 7123615A JP 12361595 A JP12361595 A JP 12361595A JP 2989118 B2 JP2989118 B2 JP 2989118B2
- Authority
- JP
- Japan
- Prior art keywords
- iron
- silicon
- nitride
- iron nitride
- 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.)
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- Ceramic Products (AREA)
- Compositions Of Oxide Ceramics (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、鉄含有量4〜8重量%
の窒化珪素鉄に関する。BACKGROUND OF THE INVENTION The present invention relates to an iron content of 4 to 8 % by weight.
Related to silicon iron nitride.
【0002】[0002]
【従来の技術】従来より、レンガ等の定形耐火物、高炉
出銑口閉塞用マッド材、出銑樋材等の不定形耐火物とし
ては、耐食性を付与するための窒化珪素鉄と耐火強度
(熱間強度)等を付与するための骨材との混合物が用い
られている。そして、骨材としては、シリカ、アルミナ
等の酸化物粉末、炭素、炭化珪素等の非酸化物粉末が使
用されている。2. Description of the Related Art Conventionally, as a fixed refractory such as a brick, a mud material for closing a blast furnace taphole, a tapping gutter material, etc., silicon nitride for imparting corrosion resistance and refractory strength ( A mixture with an aggregate for providing hot strength) or the like is used. As the aggregate, oxide powders such as silica and alumina, and non-oxide powders such as carbon and silicon carbide are used.
【0003】しかしながら、従来の窒化珪素鉄の鉄分は
15重量%又はそれ以上と高いので温度1400℃以上
の高温域では耐火物中に存在する鉄が液相となり組織を
弱くするのでスラグに対する耐食性が低下する問題があ
った。However, the iron content of conventional silicon iron nitride is as high as 15% by weight or more, so that iron existing in the refractory becomes a liquid phase in a high temperature range of 1400 ° C. or more, which weakens the structure, and thus the corrosion resistance to slag is reduced. There was a problem of lowering.
【0004】[0004]
【発明が解決しようとする課題】本発明の目的は、上記
問題を解決するもので、高温域におけるスラグに対する
耐食性と耐火強度の改善された耐火物を製造することの
できる窒化珪素鉄を提供することである。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to provide a silicon iron nitride capable of producing a refractory having improved corrosion resistance to slag in a high temperature range and fire resistance. That is.
【0005】[0005]
【0006】すなわち、本発明は、鉄含有量4〜8重量
%の窒化珪素鉄である。That is, the present invention is a silicon iron nitride having an iron content of 4 to 8 % by weight.
【0007】以下、更に詳しく本発明を説明する。Hereinafter, the present invention will be described in more detail.
【0008】窒化珪素鉄中の鉄は、高温において窒化珪
素同士、骨材同士、窒化珪素と骨材が反応しマトリック
スに炭化珪素、窒化アルミニウム等を生成させて組織を
緻密化させる際の反応促進剤として機能する。しかしな
がら、これらの反応において、鉄はある程度リサイクル
されながら反応に関与するので、鉄が多いと、本来残留
してマトリックス強化に携わる窒化珪素と反応し、副生
する窒素、一酸化炭素等のガス量も多くなるので焼結体
中に気孔が増加し耐火強度が低下する。また、余剰の鉄
分は1400℃以上の高温域において液相として残留す
るため耐火強度、耐食性の低下要因となる。[0008] Iron in silicon iron nitride promotes a reaction when silicon nitride, aggregate, silicon nitride and aggregate react at high temperature to produce silicon carbide, aluminum nitride and the like in a matrix to densify the structure. Functions as an agent. However, in these reactions, iron is involved in the reaction while being recycled to some extent, so if there is a large amount of iron, the amount of gas such as nitrogen and carbon monoxide, which originally remain and reacts with silicon nitride, which is involved in matrix reinforcement, is generated. Therefore, pores increase in the sintered body and the fire resistance decreases. Further, excess iron remains as a liquid phase in a high temperature region of 1400 ° C. or more, which causes a reduction in fire resistance and corrosion resistance.
【0009】以上の観点から、本発明においては窒化珪
素鉄の鉄含有量を4〜8重量%と限定したものである。
鉄含有量が4重量%未満では上記反応が十分に進行しな
くなるので耐火物の耐火強度が劣るようになり、しかも
粒子相互の結合も弱くなるので耐食性も小さくなる。ま
た、鉄含有量が8重量%をこえると鉄量が過剰となり反
応が進行しすぎ、上記のとおり気孔の増大、液相の増加
によって耐火強度、耐食性が低下する。In view of the above, in the present invention, the iron content of silicon silicon nitride is limited to 4 to 8 % by weight.
If the iron content is less than 4 % by weight, the above reaction does not proceed sufficiently, so that the fire resistance of the refractory becomes inferior, and the bonding between particles becomes weak, so that the corrosion resistance also becomes low. On the other hand, when the iron content exceeds 8 % by weight, the amount of iron becomes excessive and the reaction proceeds too much, and as described above, the fire resistance and the corrosion resistance decrease due to the increase in pores and the liquid phase.
【0010】窒化珪素鉄の粒度としては、最大粒径0.
2mm以下であることが好ましいが、特に10μm以下
45体積%以上とすることによって以下の効果を発現す
る。 (1)重量当たりの反応面積や骨材等との接触頻度が大
きくなり反応性が向上する。 (2)窒化珪素鉄粉末と骨材とが均一に混合され耐火物
の反応が均一化し、また焼結性も向上する。 (3)耐火物のマトリックスへの充填性が高まり組織が
緻密化する。 なお、窒化珪素鉄と骨材の割合としては、窒化珪素鉄1
〜50重量%、骨材99〜50重量%であることが好ま
しい。[0010] The particle size of silicon iron nitride is as follows.
The thickness is preferably 2 mm or less, but the following effects are particularly exhibited when the volume is 10 μm or less and 45% by volume or more. (1) The reaction area per weight and the frequency of contact with the aggregate and the like are increased, and the reactivity is improved. (2) The silicon nitride powder and the aggregate are uniformly mixed, the reaction of the refractory is made uniform, and the sinterability is improved. (3) The filling property of the refractory into the matrix is increased, and the structure is densified. In addition, the ratio of silicon iron nitride to aggregate is
It is preferable that the content is 50 to 50% by weight and the aggregate is 99 to 50% by weight.
【0011】[0011]
【実施例】以下、実施例、比較例により本発明をより具
体的に説明する。The present invention will be more specifically described below with reference to examples and comparative examples.
【0012】実施例1〜7 比較例1〜4 炭化珪素粉末(屋久島電工社製)、ロー石粉末(五島
産)、焼結アルミナ(昭和電工社製)、コークス粉末
(三菱化学社製)と種々の鉄含有量の窒化珪素鉄(最大
粒径0.2mm)を表1に示すとおり混合し、更にその
100重量部に対してタール18〜21重量部を加え、
約70℃で保温しながら混練した。得られた混練物を四
角柱状に成型後アルゴン雰囲気下、温度1400℃で焼
成しサンプルを製造し、以下の熱間曲げ強度、耐食性及
び気孔率を測定した。その結果を表1に示す。Examples 1-7 Comparative Examples 1-4 Silicon carbide powder (manufactured by Yakushima Denko Co., Ltd.), lozenge powder (produced by Goto), sintered alumina (manufactured by Showa Denko KK), coke powder (manufactured by Mitsubishi Chemical Corporation) Silicon iron nitride having various iron contents (maximum particle size: 0.2 mm) was mixed as shown in Table 1, and 18 to 21 parts by weight of tar was added to 100 parts by weight thereof.
The mixture was kneaded while keeping the temperature at about 70 ° C. The obtained kneaded product was formed into a square column shape, and then fired at a temperature of 1400 ° C. in an argon atmosphere to produce a sample, and the following hot bending strength, corrosion resistance and porosity were measured. Table 1 shows the results.
【0013】(1)熱間曲げ強度:温度1400℃にお
ける3点曲げ強度を測定した。 (2)耐食性:サンプルを1500℃に溶融されたスラ
グに浸漬し、テストピースを回転させながら3時間保持
した後の浸食深さを測定し、比較例1を100とした相
対値を算出した。数値の小さい方が良好なものである。 (3)気孔率:アルキメデス法で測定した。(1) Hot bending strength: A three-point bending strength at a temperature of 1400 ° C. was measured. (2) Corrosion resistance: The sample was immersed in a slag melted at 1500 ° C., the erosion depth was measured after holding the test piece for 3 hours while rotating, and a relative value was calculated with Comparative Example 1 being 100. The smaller the value, the better. (3) Porosity: measured by Archimedes' method.
【0014】[0014]
【表1】 [Table 1]
【0015】実施例8 10μm以下60体積%の粒度構成からなる窒化珪素鉄
粉末を用いたこと以外は実施例3と同様にして試験し
た。その結果、熱間曲げ強度89kgf/cm2、耐食
性43及び気孔率30.2%であった。Example 8 A test was conducted in the same manner as in Example 3 except that a silicon iron nitride powder having a particle size of 10 μm or less and 60% by volume was used. As a result, the hot bending strength was 89 kgf / cm 2 , the corrosion resistance was 43, and the porosity was 30.2%.
【0016】[0016]
【発明の効果】本発明によれば、耐食性と耐火強度(熱
間曲げ強度)に優れた耐火物を製造することのできる窒
化珪素鉄を得ることができる。According to the present invention, it is possible to obtain silicon iron nitride capable of producing a refractory excellent in corrosion resistance and fire resistance (hot bending strength).
フロントページの続き (58)調査した分野(Int.Cl.6,DB名) C01B 21/082 C04B 35/66 C04B 35/00 CA(STN)Continuation of the front page (58) Field surveyed (Int. Cl. 6 , DB name) C01B 21/082 C04B 35/66 C04B 35/00 CA (STN)
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7123615A JP2989118B2 (en) | 1995-05-23 | 1995-05-23 | Silicon iron nitride |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7123615A JP2989118B2 (en) | 1995-05-23 | 1995-05-23 | Silicon iron nitride |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH08319103A JPH08319103A (en) | 1996-12-03 |
JP2989118B2 true JP2989118B2 (en) | 1999-12-13 |
Family
ID=14864984
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7123615A Expired - Fee Related JP2989118B2 (en) | 1995-05-23 | 1995-05-23 | Silicon iron nitride |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2989118B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5144300B2 (en) * | 2008-02-15 | 2013-02-13 | 黒崎播磨株式会社 | Mud |
-
1995
- 1995-05-23 JP JP7123615A patent/JP2989118B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
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JPH08319103A (en) | 1996-12-03 |
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