JPH06661B2 - Refractory bricks containing silicon nitride for hot metal treatment - Google Patents
Refractory bricks containing silicon nitride for hot metal treatmentInfo
- Publication number
- JPH06661B2 JPH06661B2 JP63028741A JP2874188A JPH06661B2 JP H06661 B2 JPH06661 B2 JP H06661B2 JP 63028741 A JP63028741 A JP 63028741A JP 2874188 A JP2874188 A JP 2874188A JP H06661 B2 JPH06661 B2 JP H06661B2
- Authority
- JP
- Japan
- Prior art keywords
- silicon nitride
- weight
- graphite
- hot metal
- silicon
- 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
Links
- 239000011449 brick Substances 0.000 title claims description 31
- 229910052581 Si3N4 Inorganic materials 0.000 title claims description 25
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 title claims description 25
- 229910052751 metal Inorganic materials 0.000 title claims description 12
- 239000002184 metal Substances 0.000 title claims description 12
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 21
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 19
- 229910002804 graphite Inorganic materials 0.000 claims description 18
- 239000010439 graphite Substances 0.000 claims description 18
- 239000002994 raw material Substances 0.000 claims description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 7
- 239000010703 silicon Substances 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- 238000004901 spalling Methods 0.000 description 11
- 229910000831 Steel Inorganic materials 0.000 description 7
- 230000007797 corrosion Effects 0.000 description 7
- 238000005260 corrosion Methods 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229910052580 B4C Inorganic materials 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910003465 moissanite Inorganic materials 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 229930014626 natural product Natural products 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002006 petroleum coke Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、鋼の清浄化、鋼の高級化並びに鋼の製造コス
トの低減を目的に実施される溶銑処理用混銑車等の耐火
れんがに関する。Description: TECHNICAL FIELD The present invention relates to a refractory brick such as a mixed pig iron car for hot metal treatment which is carried out for the purpose of cleaning steel, upgrading steel, and reducing the manufacturing cost of steel. .
［従来の技術］ 溶銑処理用混銑車の炉材はAl2O3・ＳｉＣ・Ｃ系不焼成
耐火れんがが主体である。この耐火れんがにおける各原
料の役割は、アルミナは耐食性の向上、黒鉛はスラグ浸
潤防止並びに耐スポーリング性の向上、炭化珪素は黒鉛
の酸化防止を目的として使用される。また、場合によっ
て、黒鉛の酸化防止並びに組織の強化を目的としてアル
ミニウム、シリコン等の金属または炭化硼素が添加され
る。[Prior Art] Al 2 O 3 , SiC, C-based unfired refractory bricks are mainly used as the furnace material of the hot metal mixing hot metal car. The role of each raw material in this refractory brick is that alumina is used for the purpose of improving corrosion resistance, graphite for preventing slag infiltration and spalling resistance, and silicon carbide for preventing oxidation of graphite. Further, in some cases, a metal such as aluminum or silicon or boron carbide is added for the purpose of preventing the oxidation of graphite and strengthening the structure.
黒鉛量は一般的に耐食性の観点から上限を２０重量％、
耐スポーリング性の観点から下限を３重量％とするのが
望ましいとされている。From the viewpoint of corrosion resistance, the upper limit of the amount of graphite is generally 20% by weight,
From the viewpoint of spalling resistance, it is desirable to set the lower limit to 3% by weight.
現在の溶銑処理用耐火れんがにおいては、耐スポーリン
グ性重視の観点から黒鉛を更に増量する傾向にある。In the current refractory bricks for hot metal treatment, the amount of graphite tends to be further increased from the viewpoint of emphasis on spalling resistance.
［発明が解決しようとする課題］ しかし、Al2O3・ＳｉＣ・Ｃ系耐火れんがにおいて、黒
鉛の使用量は耐食性の観点からすると少ない方が望まし
い。[Problems to be Solved by the Invention] However, in Al 2 O 3 .SiC.C refractory bricks, it is desirable that the amount of graphite used is small from the viewpoint of corrosion resistance.
また、最近では混銑車の熱損失並びに鉄皮の温度上昇と
いう問題から炉材の低熱伝導率化すなわち黒鉛量の低減
が要求されている。Further, recently, due to the problems of heat loss of a hot metal truck and temperature rise of a steel shell, there has been a demand for a lower thermal conductivity of a furnace material, that is, a reduction in the amount of graphite.
従って、本発明の目的はAl2O3・ＳｉＣ・Ｃ系耐火れん
がの耐スポーリング性を低下させることなしに黒鉛量を
低減させることにある。Therefore, an object of the present invention is to reduce the amount of graphite without lowering the spalling resistance of Al 2 O 3 .SiC.C refractory bricks.
［課題を解決するための手段］ すなわち、本発明は窒化珪素３〜１５重量％、黒鉛３〜
２０重量％、炭化珪素０〜１２重量％、シリコン３〜６
重量％及び残部がアルミナ系原料からなり且つ窒化珪素
と炭化珪素の合計量が１５重量％以下であることを特徴
とする溶銑処理用窒化珪素含有耐火れんがに係る。[Means for Solving the Problems] That is, the present invention relates to 3 to 15% by weight of silicon nitride and 3 to 3% of graphite.
20% by weight, silicon carbide 0-12% by weight, silicon 3-6
The present invention relates to a silicon nitride-containing refractory brick for hot metal treatment, characterized in that the weight percentage and the balance are made of an alumina-based raw material and the total amount of silicon nitride and silicon carbide is 15 wt% or less.
［作用］ 本発明の溶銑処理用窒化珪素含有耐火れんが（以下、本
発明の耐火れんがと略称する）は従来のAl2O3・ＳｉＣ
・Ｃ系耐火れんがの炭化珪素の一部または全てを窒化珪
素に置き換え、窒化珪素を３〜１５重量％配合し、炭化
珪素は０〜１２重量％とし、窒化珪素と炭化珪素の合計
量を１５重量％とし、また、黒鉛を３〜２０重量％とす
るものである。更に、本発明の耐火れんがには、シリコ
ンを３〜６重量％配合する。[Function] The silicon nitride-containing refractory brick for hot metal treatment of the present invention (hereinafter, simply referred to as the refractory brick of the present invention) is a conventional Al 2 O 3 .SiC.
-Part or all of the silicon carbide of the C-based refractory brick is replaced with silicon nitride, silicon nitride is blended in an amount of 3 to 15% by weight, silicon carbide is 0 to 12% by weight, and the total amount of silicon nitride and silicon carbide is 15%. % By weight, and 3 to 20% by weight of graphite. Further, the refractory brick of the present invention contains 3 to 6% by weight of silicon.
本発明の耐火れんがに窒化珪素を採用した理由は下記の
通りである： 窒化珪素は炭化珪素に比し熱膨張率が小さい。The reason why silicon nitride is used for the refractory brick of the present invention is as follows: Silicon nitride has a smaller coefficient of thermal expansion than silicon carbide.
窒化珪素は炭化珪素に比し熱伝導率が小さい。Silicon nitride has a smaller thermal conductivity than silicon carbide.
窒化珪素は低酸素分圧下において炭化珪素ウイスカー
を生成し、弾性率を上げることなしに組織を強化するこ
とができるために、耐スポーリング性の向上に好まし
い。Silicon nitride is preferable for improving spalling resistance because it forms silicon carbide whiskers under a low oxygen partial pressure and can strengthen the structure without increasing the elastic modulus.
窒化珪素は炭化珪素に比し熱膨張が約半分であることか
ら耐スポーリング性を高める作用をする。本発明の耐火
れんがは低黒鉛含量のために生ずる耐スポーリング性の
低下を窒化珪素の添加により軽減するものである。ま
た、窒化珪素は上述のように低熱伝導性材料であること
から添加することにより耐火れんがの低熱伝導化にも寄
与する。Since silicon nitride has a thermal expansion which is about half that of silicon carbide, it has the function of enhancing spalling resistance. The refractory brick of the present invention alleviates the decrease in spalling resistance caused by the low graphite content by the addition of silicon nitride. Further, since silicon nitride is a low thermal conductivity material as described above, its addition also contributes to the low thermal conductivity of refractory bricks.
更に、窒化珪素をシリコンなどの酸化性原料と共に使用
した場合、耐火れんが中が低酸素分圧雰囲気となるため
に窒化珪素ウイスカーを生成する。これによって耐火れ
んがの組織を強化することが可能であり、耐スポーリン
グ性が向上する。Furthermore, when silicon nitride is used together with an oxidizing raw material such as silicon, silicon nitride whiskers are generated because the refractory brick has a low oxygen partial pressure atmosphere. This makes it possible to strengthen the structure of the refractory brick and improve the spalling resistance.
なお、窒化珪素、炭化珪素、黒鉛、シリコン等の成分の
使用量を上述の如く限定したのは次ぎの理由による： 窒化珪素の使用量が３重量％未満であると耐スポーリ
ング性の向上に効果がなく、また、１５重量％を超える
と耐食性の低下が大きい。The amounts of the components such as silicon nitride, silicon carbide, graphite and silicon are limited as described above for the following reasons: When the amount of silicon nitride used is less than 3% by weight, the spalling resistance is improved. There is no effect, and if it exceeds 15% by weight, the corrosion resistance is greatly reduced.
炭化珪素の使用量が窒化珪素の使用量との合計量で１
５重量％を超えると耐食性の観点から好ましくなく、従
って、炭化珪素の使用量は０〜１２重量％である。The total amount of silicon carbide used and silicon nitride used is 1
If it exceeds 5% by weight, it is not preferable from the viewpoint of corrosion resistance. Therefore, the amount of silicon carbide used is 0 to 12% by weight.
黒鉛の使用量が３重量％未満であると耐スポーリング
性の著しい低下が見られ、２０重量％を超えると耐食性
の低下並びに熱伝導率の増加の原因となるために好まし
くない。If the amount of graphite used is less than 3% by weight, the spalling resistance is remarkably deteriorated, and if it exceeds 20% by weight, corrosion resistance is lowered and thermal conductivity is increased, which is not preferable.
本発明の耐火れんがに使用する窒化珪素は１mm以下程度
の粒度をもつ形態のものが好ましい。The silicon nitride used for the refractory brick of the present invention preferably has a particle size of about 1 mm or less.
炭化珪素は黒鉛の酸化防止を目的として使用するもので
微粉形態のものを使用することが好ましい。Silicon carbide is used for the purpose of preventing the oxidation of graphite, and it is preferable to use a fine powder form.
黒鉛としては天然のグラファイト、鱗状黒鉛、土状黒
鉛、人造黒鉛、石油コークス、カーボンブラック、電極
屑等を使用することができる。As graphite, natural graphite, scaly graphite, earthy graphite, artificial graphite, petroleum coke, carbon black, electrode scraps, etc. can be used.
シリコンは黒鉛の酸化防止並びに耐火れんがの組織の強
化を目的として使用するもので、０．１mm以下程度の粒
度をもつ形態のものが好ましい。Silicon is used for the purpose of preventing oxidation of graphite and strengthening the structure of refractory bricks, and preferably has a particle size of about 0.1 mm or less.
アルミナ系原料としては人造品または天然品を使用する
ことができ、粗粒、中粒または微粒のものを使用するこ
とが好ましい。As the alumina-based raw material, artificial products or natural products can be used, and it is preferable to use coarse particles, medium particles or fine particles.
本発明の耐火れんがは不焼成品であり、上述の配合をも
つ原料混合物を常法に従って混練成形し、次に、乾燥し
て耐火れんがとすることができる。The refractory brick of the present invention is a non-fired product, and a raw material mixture having the above-mentioned composition can be kneaded and molded according to a conventional method, and then dried to obtain a refractory brick.
［実施例］ 以下に実施例を挙げ、本発明を更に説明する。[Examples] The present invention will be further described with reference to Examples.
実施例 以下の第１表に記載する配合割合をもつ原料混合物にフ
ェノール樹脂３重量％（外掛け）添加した混練物を１０
００kg／cm2の成形圧で２３０×１１４×６５mmに成形
し、１５０℃で５時間乾燥することにより本発明の耐火
れんが（本発明品１〜３）を得た。Example 10 A kneaded product was prepared by adding 3% by weight (external weight) of a phenol resin to a raw material mixture having a blending ratio shown in Table 1 below.
The refractory bricks of the present invention (Products 1 to 3 of the present invention) were obtained by molding at a molding pressure of 00 kg / cm 2 to 230 × 114 × 65 mm and drying at 150 ° C. for 5 hours.
得られた耐火れんがの特性を第１表に併記する。The characteristics of the obtained refractory bricks are also shown in Table 1.
比較例 以下の第１表に記載する配合割合をもつ原料混合物を実
施例と同様の方法により比較品の耐火れんがは得た。Comparative Example A raw material mixture having a blending ratio shown in Table 1 below was obtained in the same manner as in Examples to obtain a refractory brick as a comparative product.
得られた耐火れんがの特性を第１表に併記する。The characteristics of the obtained refractory bricks are also shown in Table 1.
［発明の効果］ 本発明の耐火れんがはAl2O3・ＳｉＣ・Ｃ系耐火れんが
に窒化珪素を添加することにより耐火れんがの耐スポー
リング性を損なうことなした溶銑処理用耐火れんがの耐
食性の向上、熱損失の低下、鉄皮への熱負荷の低減を達
成することができる。また、本発明の耐火れんがは混銑
車のみならず、溶銑処理を目的とする鍋等にも適用する
ことができる。 [Advantage of the Invention] The refractory brick of the present invention is a corrosion resistant brick for hot metal treatment which does not impair the spalling resistance of the refractory brick by adding silicon nitride to the Al 2 O 3 · SiC / C refractory brick. Improvement, reduction of heat loss, and reduction of heat load on the iron shell can be achieved. Further, the refractory brick of the present invention can be applied not only to a mixed pig wheel but also to a pot or the like for the purpose of hot metal treatment.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 副島 利行 兵庫県加古川市金沢町１ 株式会社神戸製 鋼所加古川製鉄所内 (72)発明者 小林 潤吉 兵庫県加古川市金沢町１ 株式会社神戸製 鋼所加古川製鉄所内 (72)発明者 大島 隆三 兵庫県加古川市金沢町１ 株式会社神戸製 鋼所加古川製鉄所内 (72)発明者 大手 彰 兵庫県加古川市金沢町１ 株式会社神戸製 鋼所加古川製鉄所内 (56)参考文献 特開 昭58−99164（ＪＰ，Ａ) 特開 昭52−76312（ＪＰ，Ａ) 特開 昭52−100332（ＪＰ，Ａ) 特開 昭59−107961（ＪＰ，Ａ) 特開 昭58−74579（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiyuki Soejima 1 Kanazawa-machi, Kakogawa-shi, Hyogo Prefecture Kobe Steel Works Kakogawa Steel Works (72) Inventor Junkichi Kobayashi 1 Kanazawa-machi, Kakogawa-shi, Hyogo Kobe Steel Works Ltd. Kakogawa Steel Works (72) Inventor Ryuzo Oshima 1 Kanazawa-machi, Kakogawa-shi, Hyogo Prefecture Kobe Steel Works, Ltd.Kakogawa Steel Works, Ltd. (72) Inventor Akira Kanazawa-machi, Kakogawa City, Hyogo Prefecture 1 56) References JP-A-58-99164 (JP, A) JP-A-52-76312 (JP, A) JP-A-52-100332 (JP, A) JP-A-59-107961 (JP, A) JP-A 58-74579 (JP, A)
Claims (1)
量％、炭化珪素０〜１２重量％、シリコン３〜６重量％
及び残部がアルミナ系原料からなる且つ窒化珪素と炭化
珪素の合計量が１５重量％以下であることを特徴とする
溶銑処理用窒化珪素含有耐火れんが。1. Silicon nitride 3 to 15% by weight, graphite 3 to 20% by weight, silicon carbide 0 to 12% by weight, silicon 3 to 6% by weight.
And a balance comprising an alumina-based raw material, and the total amount of silicon nitride and silicon carbide being 15% by weight or less, a silicon nitride-containing refractory brick for hot metal treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63028741A JPH06661B2 (en) | 1988-02-12 | 1988-02-12 | Refractory bricks containing silicon nitride for hot metal treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63028741A JPH06661B2 (en) | 1988-02-12 | 1988-02-12 | Refractory bricks containing silicon nitride for hot metal treatment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01208364A JPH01208364A (en) | 1989-08-22 |
| JPH06661B2 true JPH06661B2 (en) | 1994-01-05 |
Family
ID=12256845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63028741A Expired - Lifetime JPH06661B2 (en) | 1988-02-12 | 1988-02-12 | Refractory bricks containing silicon nitride for hot metal treatment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06661B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050064542A (en) * | 2003-12-24 | 2005-06-29 | 주식회사 포스코 | Batch composition of forming refractories for blast furnace tap hole |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5276312A (en) * | 1975-12-22 | 1977-06-27 | Shinagawa Refractories Co | Manufacture of aluminaagraphite refractories by silicon nitride bondage |
| JPS5837276B2 (en) * | 1976-02-20 | 1983-08-15 | 黒崎窯業株式会社 | Fireproof material for molten metal gutters |
| JPS5874579A (en) * | 1981-10-26 | 1983-05-06 | 品川白煉瓦株式会社 | Carbon-containing refractories |
| JPS5899164A (en) * | 1981-12-09 | 1983-06-13 | 日本鋼管株式会社 | Plate refractories for sliding nozzle |
| JPS59107961A (en) * | 1982-12-13 | 1984-06-22 | 品川白煉瓦株式会社 | Carbon-containing refractories |
-
1988
- 1988-02-12 JP JP63028741A patent/JPH06661B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01208364A (en) | 1989-08-22 |
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