JPH07187825A - Aluminum titanate-alumina material for thermal spray - Google Patents
Aluminum titanate-alumina material for thermal sprayInfo
- Publication number
- JPH07187825A JPH07187825A JP5333454A JP33345493A JPH07187825A JP H07187825 A JPH07187825 A JP H07187825A JP 5333454 A JP5333454 A JP 5333454A JP 33345493 A JP33345493 A JP 33345493A JP H07187825 A JPH07187825 A JP H07187825A
- Authority
- JP
- Japan
- Prior art keywords
- thermally sprayed
- sprayed body
- aluminum titanate
- slag
- thermal spray
- 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
Landscapes
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Ceramic Products (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、たとえば製鋼容器や溶
融金属の精錬用容器等の工業窯炉及び焼却炉等の耐火ラ
イニング、あるいは耐火物品の形成，被覆及び補修に使
用する溶射材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal spray material used for refractory linings of industrial kilns and incinerators such as steelmaking vessels and vessels for refining molten metal, or for forming, coating and repairing refractory articles.
【０００２】[0002]
【従来の技術】従来から、工業窯炉のライニングの形成
や補修に際して、補修用の耐火粉末を高温の火炎中で飛
行させることによって溶融吹き付けする溶射法が広く利
用されている。2. Description of the Related Art Conventionally, when forming and repairing a lining of an industrial kiln, a thermal spraying method has been widely used in which refractory powder for repair is blown in a high-temperature flame to melt and spray.
【０００３】転炉や取鍋等の内壁面は１３００〜１５０
０℃程度の軟化溶融しているスラグ層で覆われており、
このスラグ層で覆われた炉壁面の補修に際して、直接溶
射材を溶射しても、操業中に高温加熱のためにスラグ層
が溶融し、その上に形成した溶射体が剥げ落ちてしまっ
て耐用度が著しく低下する。Inner wall surfaces of converters and ladles are 1300 to 150
It is covered with a slag layer that is softened and melted at about 0 ° C,
When repairing the furnace wall covered with this slag layer, even if the thermal spray material is directly sprayed, the slag layer melts due to high temperature heating during operation, and the sprayed material formed on it melts off and is durable. The degree is significantly reduced.
【０００４】このような問題に対し、特開昭５５−１１
６０８３号公報には、補修用溶射材を溶射する前に溶射
に使用する火炎を利用してスラグ層を除去して清浄化す
ることが記載されている。To solve such a problem, Japanese Patent Laid-Open No. 55-11
Japanese Patent No. 6083 describes that a slag layer is removed and cleaned using a flame used for thermal spraying before spraying a repairing thermal spray material.
【０００５】ところが、溶融金属容器の内張り耐火れん
がに付着しているスラグは、れんがとの反応によってそ
の粘性が大幅に増加しており、このため、火炎を当てて
も、充分に溶融化せず、その粘性のために自重で溶落す
ることはなく、２〜３ｍｍ程度の厚さで残存することに
なる。この残存スラグ層に上に溶射補修体を形成する
と、炉の作働による高温下ではスラグが軟化して、その
上面の溶射補修体が剥げ落ちてしまう。この溶射補修体
の剥離消失は、補修体が緻密化である耐食性に優れた溶
射材料において顕著である。このように、組織の緻密化
が却って溶射施工体の耐用度を低下させる原因となりか
ねない。However, the viscosity of the slag adhered to the refractory brick lining of the molten metal container is significantly increased due to the reaction with the brick, and therefore, even if a flame is applied, the slag is not sufficiently melted. However, due to its viscosity, it will not burn through under its own weight, and will remain in a thickness of about 2 to 3 mm. If a thermal spray repair body is formed on this residual slag layer, the slag will soften under high temperature due to the operation of the furnace, and the thermal spray repair body on the upper surface will peel off. The exfoliation and disappearance of the sprayed repaired body is remarkable in the sprayed material having excellent corrosion resistance in which the repaired body is densified. As described above, the densification of the structure may rather cause the durability of the thermal spraying structure to be reduced.
【０００６】そこで、特開平２−１６１２８７号公報に
おいて、Ｎａ2 Ｏ，ＳｉＯ2 のような高温時に蒸発し易
い物質を溶射材中に含有せしめることによって溶射施工
体を適度に多孔質化することによって溶射施工体の断熱
性を大きくすることが提案されている。In view of this, in Japanese Patent Laid-Open No. 2-161287, by making the thermal spraying material contain a substance such as Na 2 O and SiO 2 which easily evaporates at high temperature, the thermal spraying construction body is appropriately made porous. It has been proposed to increase the thermal insulation of the thermal spraying structure.
【０００７】この溶射施工体の断熱性を大きくすること
は、溶射施工体からスラグへの伝熱量を小さくすること
ができ、スラグ層の溶解流れ落ちを防止する上に、窯炉
の熱ロスを少なくすることができるため操業上も好まし
い。Increasing the heat insulating property of the sprayed product can reduce the amount of heat transfer from the sprayed product to the slag, prevent the molten slag from flowing down, and reduce the heat loss of the kiln. Since it can be done, it is preferable in operation.
【０００８】[0008]
【発明が解決しようとする課題】しかしながら、この断
熱性を増すための多孔質溶射施工体は、強度に難点があ
り、表面摩耗による耐用性の低下が生じるという欠点が
ある。However, the porous thermal spraying product for increasing the heat insulating property has a problem in strength and has a drawback that durability is deteriorated due to surface abrasion.
【０００９】本発明は、かかる従来の溶射施工体を多孔
質化にすることによる強度上の欠点を解消するもので、
多孔質化によることなしに溶射施工体に断熱性を付与す
ることができる溶射材を提供することにある。The present invention is to eliminate the drawbacks in strength due to making the conventional thermal spraying structure porous.
It is an object of the present invention to provide a thermal spray material capable of imparting heat insulating properties to a thermal spray construction product without being made porous.
【００１０】[0010]
【課題を解決するための手段】本発明の溶射材は、チタ
ン酸アルミニユウム（Ａｌ2 ＴｉＯ5 ）５〜８０重量％
と、アルミナ２０〜９５重量％とを含有するチタン酸ア
ルミニウム−アルミナ質としたことを特徴とする。The thermal spray material of the present invention comprises aluminum titanate (Al 2 TiO 5 ) of 5 to 80% by weight.
And aluminum titanate-alumina containing 20 to 95% by weight of alumina.
【００１１】本発明の溶射材は、溶融性の調整のため
に、総量に対して、２０重量％までのコークス粉、Ｓ
ｉ，Ｍｇ，Ａｌ等の金属粉、スラグ粉及びその他耐火物
粉末を適量添加することもできる。The thermal spray material of the present invention contains 20% by weight or less of coke powder, S, and S based on the total amount for adjusting the melting property.
A suitable amount of metal powder such as i, Mg, Al, slag powder and other refractory powder can be added.
【００１２】[0012]
【作用】チタン酸アルミニウムを使用した溶射材は、低
膨張性を示す。この低膨張性は、溶射後の冷却過程にお
いて骨材の粒子自身に微細な亀裂が発生する。これによ
って生じる溶射体組織中に多数発生した微細亀裂が多数
の気孔を形成し、これによって、溶射補修体の断熱性が
大きくなり、炉内から溶射補修体を通してスラグに伝わ
る熱量を小さくすることが可能となる。[Function] A thermal spray material using aluminum titanate has a low expansion property. Due to this low expansion property, fine cracks occur in the particles of the aggregate itself in the cooling process after thermal spraying. A large number of fine cracks generated in the thermal spray structure cause a large number of pores, which increases the thermal insulation of the thermal spray repair body and reduces the amount of heat transferred from the furnace to the slag through the thermal spray repair body. It will be possible.
【００１３】なお、特開昭６２−８７４６５号公報に
は、チタン酸アルミニウムした溶射材が記載されている
が、この単味では溶融時の粘性が低く流れ出す。これに
対して、本発明はチタン酸アルミニウムとアルミナの組
合せであるため、溶融時の粘性も適度に保持され、溶射
材料の流れ出しの発生はない。Incidentally, Japanese Patent Laid-Open No. 62-87465 discloses a thermal spray material made of aluminum titanate, but this material alone has a low viscosity when melted and flows out. On the other hand, since the present invention is a combination of aluminum titanate and alumina, the viscosity at the time of melting is appropriately maintained, and the spray material does not flow out.
【００１４】[0014]
【実施例】表１は、本発明の実施例におけるチタン酸ア
ルミニウムとアルミナの配合とその特性を比較例と共に
示すものである。EXAMPLES Table 1 shows the formulations of aluminum titanate and alumina in the examples of the present invention and their characteristics together with comparative examples.
【００１５】溶射材の粒度はいずれも１ｍｍ以下であ
り、溶射をＬＰＧ，灯油等の気体または液体燃料やコー
クス等の固形燃料を熱源とする火炎法によって行った。
そして、溶射材を搬送するガスは、Ｏ2 ，空気，Ｎ2 ，
ＣＯ，ＣＯ2 ，Ａｒや工場で発生するたとえば高炉ガ
ス，コークス炉ガス，熱風炉ガスまたは転炉ガス等のう
ちの１種又は２種以上の組合せのものを用いた。The particle size of each sprayed material was 1 mm or less, and the spraying was performed by a flame method using a gas such as LPG or kerosene or a solid fuel such as liquid fuel or coke as a heat source.
The gas carrying the thermal spray material is O 2 , air, N 2 ,
One or a combination of two or more of CO, CO 2 , Ar, and blast furnace gas, coke oven gas, hot stove gas, converter gas, etc. generated in the factory was used.
【００１６】[0016]
【表１】 この表から、本発明の実施例１〜３では、チタン酸アル
ミニウムの重量％がアルミナの重量％よりも小さい程見
掛気孔率は小さく、したがって熱伝導率も小さい。しか
しながら、比較例１，２と比べると、いずれの重量比で
あっても本発明の実施例１〜３による場合の熱伝導率は
０．２〜０．３Ｋｃａｌ／ｍ・ｈ・℃程度小さい。した
がって、溶射補修体による溶鋼から残存スラグへの熱伝
達量も減り、その溶融化が抑えられる。[Table 1] From this table, in Examples 1 to 3 of the present invention, the smaller the weight% of aluminum titanate is than the weight% of alumina, the smaller the apparent porosity and therefore the smaller the thermal conductivity. However, as compared with Comparative Examples 1 and 2, the thermal conductivity in Examples 1 to 3 of the present invention is smaller by about 0.2 to 0.3 Kcal / m · h · ° C. at any weight ratio. Therefore, the amount of heat transferred from the molten steel to the residual slag by the thermal spray repair body is also reduced, and its melting is suppressed.
【００１７】なお、比較例２ではその見掛気孔率が高く
て熱伝達率も本発明の実施例に比べて小さい。しかしな
がら、余り見掛気孔率が大き過ぎるとその機械的強度に
影響を与えて亀裂が多くなり、実際の耐用には適しな
い。In Comparative Example 2, the apparent porosity is high and the heat transfer coefficient is smaller than that of the Examples of the present invention. However, if the apparent porosity is too large, its mechanical strength is affected and cracks increase, which is not suitable for actual service.
【００１８】また、溶鋼温度をほぼ同じにしたときの耐
用度は、本発明の実施例では、チタン酸アルミニウムの
重量％がアルミナに対して増加する程大きくなってい
る。これは、この重量比による熱伝導率の低下に基づく
ことは無論である。そして、比較例との関係において
も、チタン酸アルミニウムとアルミナのいずれの量比に
おいても、大幅に増大していることが判る。In addition, the durability at the same molten steel temperature is increased as the weight% of aluminum titanate increases with respect to alumina in the embodiment of the present invention. It goes without saying that this is based on the decrease in thermal conductivity due to this weight ratio. Also, in relation to the comparative example, it can be seen that the amount ratios of aluminum titanate and alumina are significantly increased.
【００１９】[0019]
【発明の効果】本発明によって以下の効果を奏する。The present invention has the following effects.
【００２０】（１）チタン酸アルミニウムを含有するこ
とによって溶射施工体に微細な亀裂による気孔を持たせ
ることができ、このため、溶射施工体表面から窯炉の内
壁面に残存するスラグへの熱伝達が抑えられ、スラグの
溶融化を防ぐことができる。(1) By containing aluminum titanate, it is possible to make pores in the spray-coated article by fine cracks, and therefore heat from the surface of the spray-coated article to the slag remaining on the inner wall surface of the kiln. Transmission is suppressed, and slag melting can be prevented.
【００２１】（２）したがって溶射補修体が突然剥げ落
ちるような事態を避けることができ、その耐用度を大幅
に向上させることができ、補修後の窯炉の稼働率の向上
も達成できる。(2) Therefore, it is possible to avoid a situation in which the sprayed repair body is suddenly peeled off, its durability can be greatly improved, and the operating rate of the kiln after repair can be improved.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 松尾 正孝 福岡県北九州市八幡西区東浜町１番１号 黒崎窯業株式会社内 (72)発明者 前田 一夫 千葉県富津市新富20−１ 新日本製鐵株式 会社技術開発本部内 (72)発明者 加山 恒夫 千葉県富津市新富20−１ 新日本製鐵株式 会社技術開発本部内 (72)発明者 為廣 泰造 兵庫県高砂市荒井町新浜１丁目３番１号 ハリマセラミック株式会社内 (72)発明者 高橋 和男 兵庫県高砂市荒井町新浜１丁目３番１号 ハリマセラミック株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masataka Matsuo, Masataka Matsuo 1-1, Higashihama-cho, Hachimansai-ku, Kitakyushu, Fukuoka Kurosaki Ceramics Co., Ltd. (72) Kazuo Maeda 20-1 Shintomi, Futtsu, Chiba Shin Nippon Steel Stock Company Technology Development Headquarters (72) Inventor Tsuneo Kayama 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Co., Ltd. Technology Development Headquarters (72) Inventor Taizo Taehiro 1-3-3 Niihama, Arai-cho, Takasago, Hyogo Prefecture No. Harima Ceramic Co., Ltd. (72) Inventor Kazuo Takahashi 1-3-1, Niihama, Arai-cho, Takasago, Hyogo Prefecture Harima Ceramic Co., Ltd.
Claims (1)
量％と、アルミナ２０〜９５重量％とを含有するチタン
酸アルミニウム−アルミナ質溶射材。1. An aluminum titanate-alumina thermal spray material containing 5 to 80% by weight of an aluminum titanate material and 20 to 95% by weight of alumina.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5333454A JP3009815B2 (en) | 1993-12-27 | 1993-12-27 | Aluminum titanate-alumina spray material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5333454A JP3009815B2 (en) | 1993-12-27 | 1993-12-27 | Aluminum titanate-alumina spray material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07187825A true JPH07187825A (en) | 1995-07-25 |
| JP3009815B2 JP3009815B2 (en) | 2000-02-14 |
Family
ID=18266270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5333454A Expired - Fee Related JP3009815B2 (en) | 1993-12-27 | 1993-12-27 | Aluminum titanate-alumina spray material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3009815B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8900694B2 (en) | 2005-09-14 | 2014-12-02 | Itn Nanovation Ag | Layer or coating and a composition for the production thereof |
| JP2020050903A (en) * | 2018-09-26 | 2020-04-02 | Ntn株式会社 | Spray deposit |
-
1993
- 1993-12-27 JP JP5333454A patent/JP3009815B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8900694B2 (en) | 2005-09-14 | 2014-12-02 | Itn Nanovation Ag | Layer or coating and a composition for the production thereof |
| JP2020050903A (en) * | 2018-09-26 | 2020-04-02 | Ntn株式会社 | Spray deposit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3009815B2 (en) | 2000-02-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19991029 |
|
| LAPS | Cancellation because of no payment of annual fees |