JPH0248471A - Spraying reparative material for atmospheric furnace - Google Patents
Spraying reparative material for atmospheric furnaceInfo
- Publication number
- JPH0248471A JPH0248471A JP63196255A JP19625588A JPH0248471A JP H0248471 A JPH0248471 A JP H0248471A JP 63196255 A JP63196255 A JP 63196255A JP 19625588 A JP19625588 A JP 19625588A JP H0248471 A JPH0248471 A JP H0248471A
- Authority
- JP
- Japan
- Prior art keywords
- ultrafine
- alumina
- particles
- weight
- spraying
- 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.)
- Granted
Links
- 239000000463 material Substances 0.000 title claims abstract description 27
- 238000005507 spraying Methods 0.000 title description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 35
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000002245 particle Substances 0.000 claims abstract description 26
- 239000004568 cement Substances 0.000 claims abstract description 12
- 239000011882 ultra-fine particle Substances 0.000 claims abstract description 10
- 239000002270 dispersing agent Substances 0.000 claims abstract description 7
- 230000008439 repair process Effects 0.000 claims description 15
- 239000007921 spray Substances 0.000 claims description 12
- 239000000377 silicon dioxide Substances 0.000 abstract description 9
- 239000011819 refractory material Substances 0.000 abstract description 4
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000000704 physical effect Effects 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 235000021317 phosphate Nutrition 0.000 description 2
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 2
- 150000004760 silicates Chemical class 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000001723 curing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 235000010333 potassium nitrate Nutrition 0.000 description 1
- 239000004323 potassium nitrate Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- SBEQWOXEGHQIMW-UHFFFAOYSA-N silicon Chemical compound [Si].[Si] SBEQWOXEGHQIMW-UHFFFAOYSA-N 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
Landscapes
- Ceramic Products (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、鋼材加熱炉、均熱炉等の雰囲気炉の耐火物内
張りの寿命延長を図るための吹付補修材に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a spray repair material for extending the life of a refractory lining in an atmosphere furnace such as a steel heating furnace or a soaking furnace.
雰囲気炉の操業は、耐火物内張りにとっては苛酷な加熱
、冷却の繰り返しである。そのため、長時間使用するに
従い、内張り耐火物の損耗が進み、定期的な内張り耐火
物の張り替えが必要となる。The operation of an atmospheric furnace involves repeated heating and cooling, which is harsh for the refractory lining. Therefore, as the refractory lining is used for a long period of time, wear and tear on the refractory lining progresses, making it necessary to periodically replace the refractory lining.
従来、内張り耐火物の張り替え作業は流し込み施工が多
く採用されているが、枠セット、耐火物混線、圧送、流
し込み施工、養生、乾燥、昇温等の煩雑な作業工程から
なり、施工時間、補修コスト面で満足できるものではな
かった。Conventionally, pouring construction has been widely used for relining refractory linings, but it involves complicated work processes such as frame setting, refractory cross-wiring, pressure feeding, pouring construction, curing, drying, and temperature raising, which reduces construction time and repairs. The cost was not satisfactory.
この内張り耐火物の張り替え作業に、短時間で容易に補
修できる吹付補修法の適用が考えられる。The spraying repair method, which can be easily repaired in a short period of time, may be applied to the relining of the refractory lining.
■ 吹付材としての作業性として、付着帯の剥離がない
こと、
■ 内張り耐火物の接着性が強固であること、■ 加熱
、冷却の繰り返し操業であるために容積安定性が良いこ
と、
■ ８００〜１４００℃での高温度域での繰り返し使用
でも耐スポール性に優れ、強度劣化がないことが必要で
ある。■ As for workability as a spray material, there is no peeling of the adhesion zone, ■ The adhesion of the lining refractory is strong, ■ The volume stability is good due to repeated heating and cooling operations, ■ 800 It is necessary to have excellent spalling resistance and no strength deterioration even after repeated use in a high temperature range of ~1400°C.
ところが、従来の吹付材は、セメント、燐酸塩、珪酸塩
、耐火粘土等の結合材を多量に使用しているために、上
記条件を満足することができず、実際の適用はできない
。However, since conventional spray materials use large amounts of binders such as cement, phosphates, silicates, and fireclays, they cannot satisfy the above conditions and cannot be used in practice.
また、吹付施工体の強度１組織を改善するために、粒度
調整された耐火骨材に粘土、ンリカ超微粒子、アルミナ
超微粒子等を１〜１０重景％貴重ルミナセメント、分散
剤、硬化促進材を添加することが特開昭６２−３６０７
１号公報に開示されている。In addition, in order to improve the strength of the sprayed construction, 1 to 10% of clay, ultrafine alumina particles, ultrafine alumina particles, etc. are added to the refractory aggregate whose particle size has been adjusted, such as precious lumina cement, dispersant, and hardening accelerator. According to Japanese Patent Application Laid-Open No. 62-3607,
It is disclosed in Publication No. 1.
しかし、上記公報に開示されている材料は、男囲気炉、
特に雰囲気炉の天井部においては、保型性に劣ることか
ら早期に脱落し、補修効果に乏しい。However, the materials disclosed in the above publication are
Particularly in the ceiling of an atmospheric furnace, the shape retention property is poor, so it falls off early and the repair effect is poor.
〔発明が解決しようとする課題〕
本発明において解決すべき課題は、高温度域での熱間特
性及び接着性、容積安定性に優れ、とくに雰囲気炉用と
して好適な内張り補修材を提供することにある。また、
材料を簡単に、且つ確実に吹付け？！！することにより
、施工時間の短縮、寿命延長、炉材コストの低減を達成
することにある。[Problems to be Solved by the Invention] The problem to be solved by the present invention is to provide a lining repair material that has excellent hot properties, adhesive properties, and volume stability in a high temperature range, and is particularly suitable for use in atmospheric furnaces. It is in. Also,
Spray materials easily and reliably? ! ! By doing so, it is possible to shorten construction time, extend life, and reduce furnace material costs.
本発明は、耐火骨材にシリカ超微粒子、アルミナ超微粒
子を添加し、アルミナセメント、分散剤硬化促進剤を含
む低セメントボンドのキャスタブルが高温度域の熱間特
性、母材との接着性及び容積安定性に優れた接着性を有
することを見い出し、本発明の吹付は補修材を完成した
。In the present invention, ultrafine silica particles and ultrafine alumina particles are added to refractory aggregate, and a low cement bond castable containing alumina cement and a dispersant hardening accelerator has excellent hot properties in a high temperature range, adhesion to the base material, and It was discovered that the adhesive had excellent volumetric stability, and the spray repair material of the present invention was completed.
すなわち、アルミナセメント及び分散剤を含む粒度調整
された耐火物に、シリカ及びアルミナの超微粒子を含量
で５〜１０重量％と、硬化促進剤を０．２〜２．０重量
％とを含む雰囲気炉用吹付補修材であり、さらに、シリ
カ超微粒子及びアルミナの超微粒子が重量比で１７１〜
３／２の範囲にあることが望ましい。That is, an atmosphere containing 5 to 10% by weight of ultrafine particles of silica and alumina and 0.2 to 2.0% by weight of a hardening accelerator is added to a particle-sized refractory containing alumina cement and a dispersant. It is a spray repair material for furnaces, and furthermore, it contains ultrafine silica particles and ultrafine alumina particles in a weight ratio of 171~
It is desirable that it be in the range of 3/2.
本発明に使用する耐火骨材としては、電融アルミナ、焼
結アルミナ、ボーキサイト等の高アルミナ原料が挙げら
れるが、必ずしもこれらに限定されるものではない。The refractory aggregate used in the present invention includes, but is not necessarily limited to, high alumina raw materials such as fused alumina, sintered alumina, and bauxite.
マ） ＩＪックス部には高温域での熱間特性、母材との
接着惟、容積安定性の点から、アルミナ超微粒子及びシ
リカ超微粒子を使用する。M) For the IJ box part, ultrafine alumina particles and ultrafine silica particles are used in terms of hot properties in high temperature ranges, adhesion to the base material, and volume stability.
アルミナセメント及び分散剤を含む粒度調整された耐火
材料に対し、シリカ超微粒子及びアルミナ超微粒子を使
用することにより、少■のアルミナセメント量で燐酸塩
、珪酸塩、耐火粘土をバインダとする吹付材以上の良好
な母材との接着性を得ることができ、従来のセメントボ
ンド吹付材の欠点である高温度域での熱間特性、容積安
定性を付与することが可能となった。By using ultrafine silica particles and ultrafine alumina particles for refractory materials whose particle size is adjusted including alumina cement and dispersants, spraying materials with phosphates, silicates, and fireclays as binders can be used with a small amount of alumina cement. It was possible to obtain the above-mentioned good adhesion to the base material, and it became possible to provide hot properties and volume stability in a high temperature range, which are the drawbacks of conventional cement bond spray materials.
ノリカＭＡ微粒子としては、金属シリコン シリコン合
金製造の際に副生ずる揮発シリカ・あるいは湿式、乾式
で製造されるホワイトカーボンと称されるシリカフラワ
ーが挙げられ、この−次粒子は粒径１μｍ以下のものが
好ましい。Examples of Norica MA fine particles include volatile silica produced as a by-product during the production of metal silicon silicon alloys, and silica flour called white carbon produced by wet or dry methods. is preferred.
アルミナ超微粒子としては、粒径が１０μｍ以下、より
好ましくは５μｍ以下の仮焼アルミナが好適である。As the alumina ultrafine particles, calcined alumina having a particle size of 10 μm or less, more preferably 5 μm or less is suitable.
シリカ超微粒子とアルミナ超微粒子の使用量は合量で５
〜１０重量％の範囲にあり、シリカ超微粒子とアルミナ
超微粒子が重量比率で１７１〜２／３の範囲であること
が、接着性と容積安定性の点において優れている。The total amount of silica ultrafine particles and alumina ultrafine particles used is 5
-10% by weight, and a weight ratio of ultrafine silica particles to ultrafine alumina particles of 171 to 2/3 is excellent in terms of adhesiveness and volume stability.
シリカ超微粒子とアルミナ超微粒子の合量が５重量％未
満であると接着性が劣り、１０重量％超であると容積安
定性に劣る。また、シリカ超微粒子とアルミナ超微粒子
が重量比率で１７１未満であると接着性に劣り、３／２
超であると容積安定性に劣る。その理由としては、シリ
カ超微粉の粒径が１μｍ以下であるために、壁面との接
着性に著しく活性的に働くためである。If the total amount of ultrafine silica particles and ultrafine alumina particles is less than 5% by weight, the adhesiveness will be poor, and if it exceeds 10% by weight, the volume stability will be poor. Furthermore, if the weight ratio of silica ultrafine particles to alumina ultrafine particles is less than 171, adhesiveness will be poor, and 3/2
If it is too large, the volume stability will be poor. The reason for this is that since the particle size of the ultrafine silica powder is 1 μm or less, it acts extremely actively on the adhesion to the wall surface.
第１図は、シリカ超微粒子とアルミナ超微粒子との重量
比と接着せん断強度との関係を示す図であり、第２図は
シリカ超微粒子とアルミナ超微粒子との重量比と１４０
０℃まで昇温したときの膨張率との関係を示す図である
。Fig. 1 is a diagram showing the relationship between the weight ratio of ultrafine silica particles and ultrafine alumina particles and adhesive shear strength, and Fig. 2 shows the relationship between the weight ratio of ultrafine silica particles and ultrafine alumina particles and 140
It is a figure which shows the relationship with the expansion coefficient when temperature rises to 0 degreeC.
第１図に示すように、シリカ超微粒子とアルミナ超微粒
子との重量比が大きくなるにつれ接着せん断強度は増大
する。しかし、この重量比が大きくなると焼結性が向上
し、第２図に示すように、収縮傾向が強くなり、壁面と
の接着性が劣ることになる。As shown in FIG. 1, as the weight ratio of ultrafine silica particles to ultrafine alumina particles increases, the adhesive shear strength increases. However, as this weight ratio increases, the sinterability improves, and as shown in FIG. 2, the shrinkage tendency becomes stronger and the adhesion to the wall surface becomes poorer.
更に、吹付材としての作業性を維持するために硬化促進
剤を添加する必要がある。この凝集剤としては、吹付は
水分の増加を伴わない陰イオン凝集剤の硝酸カリ、硫酸
アルミニウム、硫酸マグネシウム、塩化カリウム、水酸
化カルシウム及び且つ凝集硬化促進剤としての水酸化カ
ルシウムが挙げられる。Furthermore, it is necessary to add a curing accelerator to maintain workability as a spray material. Examples of the flocculant include anionic flocculants such as potassium nitrate, aluminum sulfate, magnesium sulfate, potassium chloride, and calcium hydroxide, which do not cause an increase in water content when sprayed, and calcium hydroxide as a flocculation and hardening accelerator.
第３図は硬化促進剤の添加量と吹付は後１時間での曲げ
強さと、最大吹付は厚みを得るために必要な吹付は水分
量を示す図である。FIG. 3 is a diagram showing the amount of curing accelerator added, the bending strength after one hour of spraying, and the amount of water necessary for spraying to obtain the maximum thickness.
第３図を参照して、硬化促進剤の添加量は、全量で０．
２〜２．０重量％が好ましく、第３図に示すように０．
２重量％未満では吹付施工においてタレが発生して充分
な施工厚みが確保できず、また２、０重量％超では吹付
水分が多量に必要となり、施工体の組織が劣化し充分な
強度が得られ難＜、母材との接着性が劣化する。Referring to FIG. 3, the total amount of curing accelerator added is 0.
2 to 2.0% by weight is preferred, and as shown in FIG.
If it is less than 2% by weight, sagging will occur during spraying and it will not be possible to ensure sufficient construction thickness, and if it exceeds 2.0% by weight, a large amount of spraying moisture will be required, resulting in deterioration of the structure of the construction body and insufficient strength. Difficulty peeling <, adhesiveness with the base material deteriorates.
第１表のＡ、Ｂに本発胡の実施例を挙げ、雰囲気炉用吹
付補修材として要求な物性における測定値を示す。Tables A and B in Table 1 list examples of this developed steel, and show measured values of physical properties required as a spray repair material for atmospheric furnaces.
従来の吹付材（Ｅ−Ｇ）は全ての物性値を満足するもの
はなく、接着性、熱間物性、容積安定性のいずれかの物
性で適当でない。None of the conventional spray materials (E-G) satisfies all physical property values, and is not suitable for any of the physical properties such as adhesion, hot physical properties, and volume stability.
比較例Ｃについては、シリカ超微粒子量が多く熱間物性
、容積安定性が劣り、高温域では接着性も大幅に劣化す
る。Regarding Comparative Example C, the amount of ultrafine silica particles is large and the hot physical properties and volume stability are poor, and the adhesiveness is also significantly deteriorated in a high temperature range.
比較例りについては、アルミナ超微粒子が多く熱間物性
は良好であるが、シリカ超微粒子量が不足し接着強度が
劣化する。The comparative example has a large amount of ultrafine alumina particles and has good hot properties, but the amount of ultrafine silica particles is insufficient and the adhesive strength deteriorates.
このように、ンリカ超微粒子／アルミナ超微粒子の重量
比が１７１〜３／２の範囲を外れた比較例ＣＤの場合に
は雰囲気炉吹付補修材としては接着性に問題があった。As described above, in the case of Comparative Example CD in which the weight ratio of ultrafine particles of alumina to ultrafine particles of alumina was outside the range of 171 to 3/2, there was a problem in adhesiveness as a repair material sprayed in an atmospheric furnace.
実験的に第４図に示す炉内天井部へ１００Ｉｌｏｎ厚み
で吹付施工を行い、第５図に示す昇温曲線に従い８００
〜１４００℃の加熱、冷却を繰り返しテストを実施した
。Experimentally, the ceiling of the furnace shown in Fig. 4 was sprayed with a thickness of 100 Ilon, and according to the temperature rise curve shown in Fig. 5, 800 Ilon was applied.
A test was conducted by repeating heating and cooling at ~1400°C.
第２表に施工体剥離発生までの回数を示す。Table 2 shows the number of times until peeling of the construction object occurred.
第２表
第６図に示すように、加熱炉の加熱帯、均熱帯の天井面
の内張り耐火物損傷部に本発明材料（第１表中のＡ）を
乾式吹付機を用いてノズル部分で水と混合しなから吹付
施工を行った。As shown in Table 2, Figure 6, the material of the present invention (A in Table 1) is applied to the damaged parts of the refractory lining on the ceiling surface of the heating zone and soaking zone of the heating furnace using a dry spraying machine. Spraying was performed without mixing with water.
その結果、付着率は８５％を越え、作業性に関する支障
は全くなかった。補修後１ケ年経過し５た時点でも補修
材は健全であった。As a result, the adhesion rate exceeded 85%, and there were no problems with workability. The repair material remained sound even after 1 year had passed since the repair.
本発明は次のような優れた長所を有するものである。 The present invention has the following excellent advantages.
（１） 内張り耐火物の長寿命が計れ、耐火物コスト
が低減できる。(1) The refractory lining can have a long service life and the cost of refractories can be reduced.
（２）、熱間での特性（強度、容積安定性）及び内張り
耐火物との接着性に優れる。(2) Excellent hot properties (strength, volume stability) and adhesion to lining refractories.
（３）吹付は施工により短時間で施工でき、特別な乾燥
が不要である。(3) Spraying can be applied in a short time and does not require special drying.
第１図および第２図は本発明の補修材におけるシリカ／
アルミナの重量比が施工体に与える影響を示し、第３図
は硬化促進剤の影響を示す図である。
第４図から第６図は本発明の補修材のテスト条件を示す
図である。
特許出願人 黒崎窯業株式会社（ばか１名）代 理 人
小 堀 益 （ほか２名）第１図
第３図
ン”Ｉｂ１ｒ糾す比
０．５ １ １．５ ２
社化侶道則Ｃ加量
２．５
第２図
第４図
量４００
、晶度 （０ｃ）Figures 1 and 2 show silica/silica in the repair material of the present invention.
FIG. 3 is a diagram showing the influence of the weight ratio of alumina on the construction body, and FIG. 3 is a diagram showing the influence of the curing accelerator. 4 to 6 are diagrams showing test conditions for the repair material of the present invention. Patent applicant: Kurosaki Ceramics Co., Ltd. (1 idiot) Representative: Masu Kobori (2 others) .5 Figure 2 Figure 4 Weight 400, Crystallinity (0c)
Claims (2)
ｍ以下のアルミナ超微粒子とを合量で５〜１０重量％と
、 アルミナセメント２〜６重量％と、 分散剤０．１〜１．０重量％と、 硬化促進剤０．２〜２．０重量％と を含有せしめてなることを特徴とする雰囲気炉用吹付補
修材。1. Particle size-adjusted refractory aggregate contains ultrafine silica particles with a particle size of 1 μm or less and particle size of 10 μm.
A total of 5 to 10% by weight of alumina ultrafine particles with a diameter of 1.5 m or less, 2 to 6% by weight of alumina cement, 0.1 to 1.0% by weight of a dispersant, and 0.2 to 2.0% of a hardening accelerator. A spray repair material for atmospheric furnaces, characterized in that it contains % by weight.
が１／１〜３／２である特許請求の範囲第１項記載の雰
囲気炉用吹付補修材。2. The spray repair material for an atmospheric furnace according to claim 1, wherein the weight ratio of the contained ultrafine silica particles to the ultrafine alumina particles is from 1/1 to 3/2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63196255A JP2596594B2 (en) | 1988-08-06 | 1988-08-06 | Spray repair material for atmosphere furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63196255A JP2596594B2 (en) | 1988-08-06 | 1988-08-06 | Spray repair material for atmosphere furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0248471A true JPH0248471A (en) | 1990-02-19 |
| JP2596594B2 JP2596594B2 (en) | 1997-04-02 |
Family
ID=16354768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63196255A Expired - Lifetime JP2596594B2 (en) | 1988-08-06 | 1988-08-06 | Spray repair material for atmosphere furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2596594B2 (en) |
-
1988
- 1988-08-06 JP JP63196255A patent/JP2596594B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2596594B2 (en) | 1997-04-02 |
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