JP2714324B2 - Chromium spray material - Google Patents
Chromium spray materialInfo
- Publication number
- JP2714324B2 JP2714324B2 JP4155457A JP15545792A JP2714324B2 JP 2714324 B2 JP2714324 B2 JP 2714324B2 JP 4155457 A JP4155457 A JP 4155457A JP 15545792 A JP15545792 A JP 15545792A JP 2714324 B2 JP2714324 B2 JP 2714324B2
- Authority
- JP
- Japan
- Prior art keywords
- chromium
- alumina
- weight
- surface area
- specific surface
- 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
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- Ceramic Products (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、工業窯炉の耐火ライニ
ングの形成あるいは補修用として用いられるクロム質溶
射材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chromium sprayed material used for forming or repairing a refractory lining of an industrial kiln.
【０００２】[0002]
【従来の技術】近年、工業窯炉の耐火ライニング及びそ
の補修に高温、高速の火炎中を耐火粉末を飛行させて溶
融し、吹き付ける溶射法が利用されるようになった。そ
して、通常の工業窯炉に対する溶射には、ＬＰＧ−酸
素、灯油−酸素、及びコークス粉−酸素炎等による火炎
あるいはプラズマ等による方法が採用されている。2. Description of the Related Art In recent years, a thermal spraying method in which a refractory powder is melted and blown in a high-temperature, high-speed flame has been used for refractory lining and repair of an industrial kiln. In addition, a method using a flame such as LPG-oxygen, kerosene-oxygen, and coke powder-oxygen flame, or a plasma method is used for the thermal spraying of a normal industrial kiln.
【０００３】従来、かかる溶射に用いられる溶射材の一
つとして、例えば特公昭６０−３５３１１号公報に記載
されているクロム質溶射材がある。このクロム質溶射材
は、高耐食性、高熱間強度において優れたものである
が、クロム質材料が４０重量％を超えると、アルミナが
持つ耐摩耗性と付着性が失われると同時に溶射層間の組
織が緩み好ましくないので、クロム質原料の使用量を４
０重量％以下にすることを条件として、即ちクロム質材
料の含有量を、１０〜４０重量％としている。このた
め、反対にクロム質耐火物としての本来の耐食性と熱間
強度に優れた特長が十分に生かされていないものとな
り、そのため、溶鉄、溶融スラグと直接接触する製鋼用
転炉、取鍋等の内張りライニングや補修用として用いる
場合には、耐食性、熱間強度が不十分である。Conventionally, as one of the thermal spray materials used for such thermal spraying, there is, for example, a chromium thermal spray material described in Japanese Patent Publication No. 60-35311. This chromium sprayed material is excellent in high corrosion resistance and high hot strength. However, if the chromium material exceeds 40% by weight, the wear resistance and adhesion of alumina are lost, and the structure between the sprayed layers is also lost. The amount of chromium raw material used is
On condition that the content is 0% by weight or less, that is, the content of the chromic material is set to 10 to 40% by weight. For this reason, on the contrary, the original features of corrosion resistance and hot strength as a chromium refractory are not fully utilized, and as a result, steelmaking converters, ladles, etc. that come into direct contact with molten iron and molten slag When it is used for lining or repairing, it has insufficient corrosion resistance and hot strength.
【０００４】[0004]
【発明が解決しようとする課題】本発明の目的は、クロ
ム質耐火物が有する耐食性と熱間強度に優れた本来の特
性を発揮できるクロム質溶射材を提供することにある。SUMMARY OF THE INVENTION It is an object of the present invention to provide a chromium sprayed material capable of exhibiting the original characteristics of a chromium refractory having excellent corrosion resistance and hot strength.
【０００５】[0005]
【課題を解決する手段】本発明は、クロム質材料の多量
とアルミナの少量とを組合せ使用することによって、ク
ロム質材料の特徴である耐食性と熱間強度を大幅に向上
させるとともに、上記従来例の欠点である組織の緩み等
を防止することを見出し、そのために溶射材にクロム質
材料４５〜７０重量％と、比表面積が１〜５０ｍ2／ｇ
のアルミナ２５〜５５重量％とを含有せしめることによ
ってその目的を達成した。According to the present invention, the combination of a large amount of chromium material and a small amount of alumina greatly improves the corrosion resistance and hot strength, which are the characteristics of the chromium material, as well as the conventional example. To prevent loosening of the structure, which is a drawback of the method, and to that end, 45 to 70% by weight of the chromium material is used as the thermal spraying material, and the specific surface area is 1 to 50 m 2 / g.
The object was achieved by incorporating 25 to 55% by weight of alumina.
【０００６】クロム質原料とては、クロム鉄鉱、電融ま
たは焼結マグクロクリンカー等が使用でき、Ｃｒ2 Ｏ3
成分が２０重量％以上含有するものが好ましい。配合割
合は４５〜７０重量％、好ましくは４５〜６０重量％で
ある。４５重量％未満では耐食性、熱間強度に劣り、７
０重量％超では付着性に劣る。As the chromium raw material, chromite, electrofused or sintered magcroclinker and the like can be used, and Cr 2 O 3
Those containing 20% by weight or more of the components are preferred. The mixing ratio is 45 to 70% by weight, preferably 45 to 60% by weight. If the content is less than 45% by weight, corrosion resistance and hot strength are inferior.
If it exceeds 0% by weight, the adhesion is poor.
【０００７】アルミナは仮焼アルミナ、焼結アルミナ、
電融アルミナ等が使用でき、アルミナの純度は９５％以
上あれば、特に制限はない。Alumina is calcined alumina, sintered alumina,
There is no particular limitation as long as the fused alumina can be used and the purity of alumina is 95% or more.
【０００８】[0008]
【作用】本発明の溶射材は、クロム質材料を４５〜７０
重量％配合することにより、Ｃｒ2 Ｏ3 は溶鋼・スラグ
に濡れにくい性質が発揮され耐食性を向上させる。また
Ａｌ2 Ｏ3 と完全固溶してＡｌ2 Ｏ3 の融点を上げ、熱
間強度及び耐食性も向上する。The thermal spraying material of the present invention comprises a chromium material of 45-70.
By blending by weight%, Cr 2 O 3 exhibits a property of being hardly wetted by molten steel and slag, and improves corrosion resistance. The completely solid solution with Al 2 O 3 increases the melting point of Al 2 O 3, also improved hot strength and corrosion resistance.
【０００９】前記特公昭６０−３５３１１号公報におい
て、クロム質材料の含有量が４０％を超えると、アルミ
ナが持つ耐摩耗性と付着性が失われると同時に、溶射層
間の組織が緩むので好ましくないと記載されている。In Japanese Patent Publication No. 60-35311, if the content of the chromium material exceeds 40%, the wear resistance and adhesion of alumina are lost and the structure between the thermal spray layers is loosened. It is described.
【００１０】本発明者等は、その原因はクロム質材料の
割合が増えると溶融性が低下するためと考え、溶融性が
下がらないように溶融性の高いアルミナ即ち仮焼アルミ
ナを使用するか、或いは焼結、電融アルミナを使用し、
その比表面積は１〜５０ｍ2／ｇが良く、比表面積が低
い焼結、電融アルミナを使用する場合は溶融性が下がら
ないように、例えば金属Ｓｉ、Ａｌ等の金属粉を添加す
れば良いことを見出したものである。The present inventors believe that the cause is that the meltability decreases as the proportion of the chromium-based material increases, so that alumina having high meltability, that is, calcined alumina is used so that the meltability does not decrease. Or use sintered, fused alumina,
The specific surface area is preferably 1 to 50 m 2 / g , and the specific surface area is low.
It has been found that when using sintered or electrofused alumina, metal powder such as metal Si, Al or the like may be added so that the meltability does not decrease.
【００１１】仮焼アルミナについては前記特公昭６０−
３５３１１号公報でもその使用が述べられているが、仮
焼アルミナは仮焼温度により、活性度即ち比表面積が変
化する。アルミナの溶融性は、比表面積が増加すると大
きくなる傾向があるため、組織が緻密化して熱間強度が
向上する。しかし、比表面積が５０ｍ2／ｇを超えると
粒径が小さくなり過ぎて材料の流動性の低下による脈動
（息付き現象）で溶射面への溶融付着が平均化されず、
均一な組織ができなくなるとともに、発塵により付着す
る量が低下する。この比表面積は、粒径のみに左右され
るものではなく、粒子表面形状によっても変化するとこ
ろが大きく、粒径が大きくても粒子表面の起伏が大きい
アルミナを選択することで比表面積は広くなる。このこ
とは、粒径が小さい揚合も含めて、比表面積を１〜５０
ｍ2／ｇと一定の範囲に保つことで、アルミナの使用粒
度域を拡大可能となる。そして、溶射材の溶融性が適度
となるような比表面積を有する仮焼アルミナを選択すれ
ば良い。The calcined alumina is described in
Although its use is described in JP-A-35311, the activity, that is, the specific surface area of calcined alumina changes depending on the calcining temperature. Since the meltability of alumina tends to increase as the specific surface area increases, the structure becomes denser and the hot strength improves. However, when the specific surface area exceeds 50 m 2 / g, the particle diameter becomes too small, and the fusibility (puffing phenomenon) due to the decrease in the fluidity of the material does not average the melt adhesion to the sprayed surface,
A uniform tissue cannot be formed, and the amount of adhesion due to dust generation decreases. The specific surface area does not depend only on the particle size, but greatly varies depending on the particle surface shape. Even if the particle size is large, the specific surface area is widened by selecting alumina having large undulations on the particle surface. This means that the specific surface area is 1 to 50, even when the particle size is small.
By keeping m 2 / g within a certain range, it is possible to expand the range of the used particle size of alumina. Then , calcined alumina having a specific surface area such that the meltability of the thermal spray material becomes appropriate may be selected.
【００１２】[0012]
【実施例】表１は、本発明の実施例に係る配合組成とそ
の特性を、比較例とともに示す。同表において、使用し
た溶射材の粒度はいずれも３００μｍ以下であり、プロ
パン−酸素の火炎を熱源としたものである。EXAMPLES Table 1 shows the composition and characteristics of the compounds according to the examples of the present invention, together with comparative examples. In the same table, the particle size of each of the sprayed materials used was 300 μm or less, and the flame of propane-oxygen was used as a heat source.
【００１３】同表に示すように、大きな比表面積を有す
るアルミナ或いは比表面積が低いアルミナを使用する場
合は金属Ａｌを添加し、クロム質材料を４５〜７０重量
％含有させた実施例の場合には、比較例と比較して付着
性、耐食性、接着性いずれにおいても優れている。As shown in the table, when alumina having a large specific surface area or alumina having a small specific surface area is used, metal Al is added and in the case of an embodiment containing 45 to 70% by weight of chromium material, Is superior in all of adhesiveness, corrosion resistance, and adhesiveness as compared with Comparative Examples.
【００１４】これに対して、クロム質材料が４５重量％
未満では耐食性及び熱間強度が低く、７０重量％超では
付着性に劣る。また、クロム質材料中のＣｒ2 Ｏ3 が２
０重量％未満では耐食性、熱間強度が低い。さらに、比
表面積が低いアルミナを使用した場合は付着性、耐食
性、接着性いずれにおいても劣っていることがわかる。On the other hand, the chromium material is 45% by weight.
If it is less than 70%, the corrosion resistance and hot strength are low, and if it exceeds 70% by weight, the adhesion is poor. In addition, Cr 2 O 3 in the chromium material is 2
If it is less than 0% by weight, corrosion resistance and hot strength are low. Furthermore, it can be seen that when alumina having a low specific surface area is used, adhesion, corrosion resistance and adhesiveness are all inferior.
【表１】 [Table 1]
【００１５】[0015]
【発明の効果】本発明によって以下の効果を奏すること
ができる。According to the present invention, the following effects can be obtained.
【００１６】（１）格別溶射条件を変更することなく、
耐食性、熱間強度を大幅に向上させた溶射体を形成でき
る。(1) Without changing the special spraying conditions,
A sprayed body having significantly improved corrosion resistance and hot strength can be formed.
【００１７】（２）ライニングの形成、補修効果を上げ
ることができ、工業窯炉の稼働率向上、補修工数の低減
などに貢献する。(2) The effect of forming and repairing the lining can be improved, which contributes to improving the operation rate of the industrial kiln and reducing the number of repairing steps.
フロントページの続き (72)発明者 原田 茂美 大分県大分市大字西ノ洲１番地 新日本 製鐵株式会社 大分製鐵所内 (72)発明者 祐成 史郎 大分県大分市大字西ノ洲１番地 新日本 製鐵株式会社 大分製鐵所内 (72)発明者 麻生 誠二 大分県大分市大字西ノ洲１番地 新日本 製鐵株式会社 大分製鐵所内 (56)参考文献 特開 平３−187981（ＪＰ，Ａ) 特公 昭57−28387（ＪＰ，Ｂ２) 特公 平２−40630（ＪＰ，Ｂ２)Continued on the front page (72) Inventor Shigemi Harada 1 Nishinosu, Oji, Oita City, Oita Prefecture Inside Nippon Steel Corporation (72) Inventor Shiro Yunari 1 Nishinosu, Oita City, Oita City, Oita Prefecture Nippon Steel Corporation Inside the Oita Works (72) Inventor Seiji Aso Oita-shi Oita, Oita Prefecture, Nishi-nosu, 1 Nippon Steel Corporation Oita Works (56) References JP-A-3-187981 (JP, A) Tokubo Sho57- 28387 (JP, B2) JP 2-40630 (JP, B2)
Claims (1)
積が１〜５０ｍ2／ｇのアルミナ２５〜５５重量％を含
有するクロム質溶射材。1. A chromium sprayed material containing 45 to 70% by weight of a chromium material and 25 to 55% by weight of an alumina having a specific surface area of 1 to 50 m 2 / g .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4155457A JP2714324B2 (en) | 1992-06-15 | 1992-06-15 | Chromium spray material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4155457A JP2714324B2 (en) | 1992-06-15 | 1992-06-15 | Chromium spray material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05345682A JPH05345682A (en) | 1993-12-27 |
| JP2714324B2 true JP2714324B2 (en) | 1998-02-16 |
Family
ID=15606469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4155457A Expired - Lifetime JP2714324B2 (en) | 1992-06-15 | 1992-06-15 | Chromium spray material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2714324B2 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5728387A (en) * | 1980-07-28 | 1982-02-16 | Fujitsu Ltd | Semiconductor optical element |
| JPS6035311A (en) * | 1983-08-04 | 1985-02-23 | Matsushita Electric Ind Co Ltd | Vertical magnetic recording head |
| JPH0240630A (en) * | 1988-08-01 | 1990-02-09 | Alps Electric Co Ltd | Liquid crystal display element |
| JPH03187981A (en) * | 1989-12-15 | 1991-08-15 | Kurosaki Refract Co Ltd | Flame spraying material |
-
1992
- 1992-06-15 JP JP4155457A patent/JP2714324B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05345682A (en) | 1993-12-27 |
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