JPS58144414A - Hearth roll for high temperature heat treatment - Google Patents

Abstract

PURPOSE: To obtain the roll capable of making good use of the effect of ZrO₂ without the exfoliation of film by controlling detrimental components having high wetting to the iron and iron oxide in the spraying film of ZrO₂ agent on the surface of hearth roll, and by adding SiO₂ to the film.

CONSTITUTION: The composition of the ceramic spraying film having ZrO₂ as main component on the surface of hearth roll barrel for the high temperature heat treatment of plate, is made to include not less than 85wt% as the sum total of not more than 5wt% of ZrO₂ stabilizer, not less than 25wt% of SiO₂, and ZrO₂. Herein, SiO₂ has low wetting to the iron and iron oxide, and decreases the cubical expansion. Further, because the ZrO₂ composed of MgO, CaO, TiO₂, Fe₂O₃, Al₂O₃ and metals such as Ni, Co, etc., has high wetting to the iron and iron oxide, the ZrO₂ stabilizer is made to be not more than 5% to achieve the purpose of stabilization and not to generate the ill effect of abovementioned wetting. Thereby, the roll surface film can be prevented from exfoliation, and the fittings to the roll surface of the iron and iron oxide brought with steel strip can be decreased.

COPYRIGHT: (C)1983,JPO&Japio

Description

【発明の詳細な説明】 この発明は高温熱処理炉用ハースロールに関し、とぐに
そのセラミック溶射被膜の耐久性を、ピックアップの有
効な防止の下に達成することの開発成果を提案するもの
である。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hearth roll for a high-temperature heat treatment furnace, and proposes the development result of achieving durability of the ceramic sprayed coating while effectively preventing pick-up.

けい素鋼ストリップのような金属ストリップを熱処理す
る炉に於いてストリップを交持するハースロール（以下
ロール）表面に金楓粉、金Ｍ１！＃化物が付着積層し７
、ストリップに凹凸前・（ピックアップ）を与えるので
、ロール表面に金属の付着しに・くい物質を溶射し、上
記トラブル全１ｆＩｉ止することが必要である。In a furnace for heat treating metal strips such as silicon steel strips, gold maple powder, gold M1! # Chemicals adhere and stack 7
Since this gives unevenness to the strip (pickup), it is necessary to thermally spray the roll surface with a material that makes it difficult for metal to adhere to it to eliminate all of the above-mentioned problems.

一帯を７５０℃以上の高温で熱処理する炉においては従
来耐熱合金で作られたハースロールが使用されてきたが
、けい素鋼などのよう［［化に対・して活性の高い合金
や、とくに都、温下に焼鈍を行う場合には網帯の持詰む
鉄粉〃び酸化鉄が、ロール表面に付着、積層する現象ｆ
顕著に生じる。Conventionally, hearth rolls made of heat-resistant alloys have been used in furnaces that heat treat entire areas at high temperatures of 750°C or higher. However, when annealing is carried out at a high temperature, iron powder and iron oxide stuck in the mesh band adhere to and accumulate on the roll surface.
occurs noticeably.

この現象を防止する方法として鉄及び酸化鉄との濡れ性
の低いセラミックスまたは金はサーメットをロール表面
に溶射することが行われ、溶射材１としてはＺｒＯ，が
著しく優れていることもよく知られているとおりである
。As a method to prevent this phenomenon, ceramics or gold having low wettability with iron and iron oxide are sprayed onto the roll surface by thermal spraying, and it is well known that ZrO is extremely superior as the thermal spraying material 1. As it is.

ＺｒＯ、だけで溶射波膜を得る場合、溶射時の高温のた
め正方晶を構成し、ロール表面で急冷されるので正方晶
のまま被膜をＩｍ成している。炉の昇温、降温時には徐
熱徐冷であるため正方晶は低温域で斜方晶に変態し、大
きな体積増加を伴うためロール地金との膨張率差により
はく離を起こす。この現象を防止するため２つの方法が
行われている。When a sprayed wave film is obtained using only ZrO, it forms a tetragonal crystal due to the high temperature during spraying, and since it is rapidly cooled on the roll surface, the film remains as a tetragonal crystal. When the temperature of the furnace is raised and lowered, it is slowly heated and cooled, so the tetragonal crystal transforms into the orthorhombic crystal in the low temperature range, and this is accompanied by a large volume increase, which causes peeling due to the difference in expansion coefficient with the roll metal. Two methods have been used to prevent this phenomenon.

一つはＺ　ｒ　Ｏｇの体積変化を防止する添加物として
ＭｇＯ、ＯａＯｍ　Ｔｉｅ２＊　Ｆｅ２Ｏ８およびＡ４
，０８のりち１成分又は機数級分を５〜１０重量％（以
下％で示す）加えることによってＺ　ｒ　Ｏｇを安定化
させる方法であり、二つ目はＮｉ　＋　Ｇｏなどの金−
を加え□Ｚ　ｒ　Ｏｚ変態時の体積変化を緩衝する方法
である。One is MgO, OaOm Tie2* Fe2O8 and A4 as additives to prevent the volume change of Z r Og.
The second method is to stabilize ZrOg by adding 5 to 10% by weight (hereinafter expressed in %) of one component or machine number grade of 08, and the second method is to stabilize ZrOg by adding gold-
This is a method of adding □Z r to buffer the volume change during Oz transformation.

しかしいずれの方法でもＺ　ｒ　Ｏｇ以外の成分は被膜
表面への鉄粉及び酸化鉄の付着を誘発促進し、ＺｒＯ□
の効果を生かすことが出来ないという錬点があった。However, in either method, components other than ZrOg induce and promote the adhesion of iron powder and iron oxide to the coating surface, and ZrO□
The problem was that it was not possible to take advantage of the effects of

この発明は、鉄及び鉄酸化物の濡れ性を低ぐする有害成
分を一宇量以下に抑制すると共にＺ　ｒ　Ｏ２の体積変
化を緩衝する物質としてとぐにＳｉＯ□で代表される醸
化けい累の有用性を見い田したところに由来するもので
ある。This invention has been developed to suppress the harmful components that reduce the wettability of iron and iron oxides to less than one quantity, and to use a fermentation silicate typified by SiO□ as a substance that buffers the volume change of ZrO2. It originates from the discovery of its usefulness.

けい素鋼用ハースロール材としては５１０２を８０％以
上含む溶融シリカロールが有効であるが単独では溶射で
きない。そこでこれを溶射成分としてざらに組合わせる
ことにより、上掲した従来技術の欠点が有利に解決され
た。As a hearth roll material for silicon steel, a fused silica roll containing 80% or more of 5102 is effective, but it cannot be thermally sprayed alone. Therefore, by roughly combining these as thermal spray components, the above-mentioned drawbacks of the prior art have been advantageously solved.

さてＺ　ｒ　Ｏｇを溶射するとその条件により正方晶と
一部立方晶を構成するが被膜を徐冷するとき、ロール材
質との間に熱膨張率差によっては〈離する恐れがあり、
低温域で斜方晶を形成する場合は更にはく離しやすい。Now, when ZrOg is thermally sprayed, it forms tetragonal and partially cubic crystals depending on the conditions, but when the film is slowly cooled, there is a risk that it will separate from the roll material due to the difference in thermal expansion coefficient.
When orthorhombic crystals are formed in a low temperature range, exfoliation is even easier.

この発明では鉄及び酸化鉄と濡れ性の低いＳ１０゜を側
合することにより体積膨張を緩衝する。このＳｉＯ□は
不定形な溶融構造を有し、急激で大きな膨張変化を有し
ていないことが特徴である。In this invention, volumetric expansion is buffered by combining iron and iron oxide with S10°, which has low wettability. This SiO□ has an amorphous molten structure and is characterized by not having rapid and large expansion changes.

セラミック被擁材の成分組成限定理由は次のとおりであ
る。The reasons for limiting the composition of the ceramic supporting material are as follows.

Ｓ１０□は粒子間結合力を高め、Ｓｉｎ、は多量に存在
することが好ましい。第１図にＳｉｎ、　−ＺｒＯ２系
セラミックの溶射被＊層の１０００°Ｃにおける粒子間
結合力とＳｉｎ、　ｆｆｉの関係を示す。該結合力は５
１０２量２５１３Ｊｔｉｔ％（以下単に％で表わす）以
上で強い結合を示す。従って高い粒子間結合力を得るた
めＳ１０．含有かは２５％以上とする。S10□ increases the bonding force between particles, and it is preferable that Sin exists in a large amount. Figure 1 shows the relationship between the interparticle bonding force and Sin, ffi at 1000°C in a thermally sprayed layer of Sin, -ZrO2-based ceramic. The bond strength is 5
102 amount of 2513 Jtit% (hereinafter simply expressed as %) or more shows strong binding. Therefore, in order to obtain high interparticle bonding force, S10. The content shall be 25% or more.

一方ＺｒＯ２はこのハースロールが配設されるべき９０
０〜１８００℃の高温雰囲気温度にても十分な・射熱性
を持つ材料として重要な組成であるからＺｒ０ｇの熱に
よる膨張を緩衝させてはく離の発生を防止する結合材と
してのＳｉｎ、　ｆｉｔと合計して８５％以上、すなわ
ちＺｒＯ，＋　１３１．Ｏｓが８ｒｉ％以上となるよう
に配合させる必要がある。On the other hand, ZrO2 is 90 where this hearth roll should be placed.
It has an important composition as a material that has sufficient heat radiation even at high ambient temperatures of 0 to 1800°C, so it is combined with Sin and Fit as a binding material that buffers the expansion due to Zr0g heat and prevents the occurrence of peeling. and 85% or more, that is, ZrO, +131. It is necessary to mix so that Os becomes 8ri% or more.

従来ＺｒＯ，の体積の急変を防ぐためにＳ％超ｌＯ％迄
添加することとされていたＭｇＯ、ＯａＯ、Ｔｉｅ、　
。MgO, OaO, Tie, which was conventionally supposed to be added to more than 10% S% in order to prevent sudden changes in the volume of ZrO,
.

Ｆｅ、Ｏ，およびＡ４，０．ならびにＮｉ　、　Ｃｏな
どの金属よりなる安定剤は、鉄及び酸化鉄との濡れ性が
高く、従ってＺｒＯ＊を安定化するにしても好ましくな
いので安定化の目的を達し、かつ上記濡れ性による。Fe, O, and A4,0. In addition, stabilizers made of metals such as Ni and Co have high wettability with iron and iron oxide, and therefore are not preferable even if they stabilize ZrO*, so the purpose of stabilization is achieved and depends on the above-mentioned wettability.

弊害を生じない５％組成以下にすることが必要である。It is necessary to keep the composition to 5% or less without causing any adverse effects.

この発明に従うＺｒＯ，−Ｓｉｎ、糸溶射被膜はＳｉｎ
。The ZrO,-Sin, thread spray coating according to this invention is
.

によってＺｒＯｇの大きな膨張本館を緩衝できるので被
着厚みは１．０闘でも充分実用に耐え、一方０．１闘未
満では薄すぎてこの発明の目的を達成しないため０．１
１１１１Ｎ１．０１１５１の範囲とする。Since the large expansion main body of ZrOg can be buffered by ZrOg, even a coating thickness of 1.0 mm is sufficient for practical use. On the other hand, if it is less than 0.1 mm, it is too thin and the purpose of this invention is not achieved, so 0.1 mm.
The range is 1111N1.01151.

Ｓｉｎ、が２５％に満たないと、Ｚｒ０ｇの体積変化を
緩衝する効果を充分に生ぜず、被膜は〈離を起′□すう
れいがあり、従ってＳｉｎｇは２５％が下限である。If Sin is less than 25%, the effect of buffering the volume change of Zr0g will not be sufficiently produced, and the coating may cause separation.Therefore, the lower limit of Sing is 25%.

またこの発明のハースロールは、主としてＺｒＯ２と８
１０．から成り、そこにピックアップ現象を防止すべく
濡れ性を低ぐする必要上、ｚｒＯ，＋　Ｓｉｎ、”で８
１Ｓ％以上とし、この合計量で８５％に満たないと鉄お
よび鉄酸化物の濡れ性が高く有害なＭｇＯ。Further, the hearth roll of this invention mainly contains ZrO2 and 8
10. In order to prevent the pickup phenomenon, it is necessary to reduce the wettability, so zrO,+Sin," is 8.
If the total amount is less than 85%, MgO has a high wettability with iron and iron oxides and is harmful.

ａａｏ　、　ＴｉＯおよびＦｅ、Ｏ，ならびにＮｉ　ｌ
　００などの怠 安定剤が過蓋になってピックアップが付着し易い現象を
あられすようになるのであり、これと同主旨においてロ
ール表面への鉄粉、酸化鉄などのＮ着を誘発しまた促進
することのないように、上記安定剤は５％以下でなけれ
ばならない。aao, TiO and Fe, O, and Ni l
Lazy stabilizers such as 00 become overcapped and cause pickups to easily adhere.In the same spirit, they induce and promote N adhesion of iron powder, iron oxide, etc. to the roll surface. The amount of stabilizer should be less than 5% to avoid damage.

溶射被膜は、当然に使用を経て摩耗し、そのことがらＱ
、１ｍ５ａ未満では寿命的に実用に適さず、一方１．Ｑ
＊ｍを越える厚膜ではその膨張力が溶！１ｌ＝１鼓膜と
ロール表面間の接合力より太きくなっては〈離を来すお
それがあり、０−１−１．Ｏｓ＋＋＋の範囲の淳みとす
ることが実際上要肋される。Thermal sprayed coatings naturally wear out with use, and this is a problem.
, less than 1m5a, it is not suitable for practical use in terms of lifespan, while 1. Q
*If the film is thicker than m, the expansion force will melt! If it becomes thicker than the bonding force between the eardrum and the roll surface (1l = 1), there is a risk of separation, and 0-1-1. In practice, it is necessary to keep the range of Os +++.

第２図に被覆層厚さと耐熱衝撃性（溶射被覆層を温度１
０００”Ｃから２６°Ｃに水冷する熱ａＳを繰返したと
きのはく離に到るまでの熱衝撃回数）の関係を示す。Figure 2 shows coating layer thickness and thermal shock resistance (sprayed coating layer at 1 temperature).
The relationship between the number of thermal shocks until peeling occurs when repeated thermal aS water cooling from 000''C to 26°C is shown.

これより被覆層厚さの上限は好ましくは約１．０鰭とす
べきことが判る。This shows that the upper limit of the coating layer thickness should preferably be about 1.0 fin.

γ６射被握層の表面はＲｍａｘ５０Ｓの表面アラサを呈
し、その−！までは被熱処理材に疵をつけろうれいもあ
るのでその表面を磨いて平滑にしてから使用することが
好ましい。The surface of the γ6 radiation-grasped layer exhibits surface roughness of Rmax50S, and its -! Since the material to be heat treated may be scratched or deteriorated, it is preferable to polish the surface to make it smooth before use.

なおセラミック被覆が施されるロールの材質は□２５　
Ｏｒ　−２０Ｎｉ鋼、２５Ｏｒ−１２Ｎｉ鋼等のステ１
ンレス鋼、耐熱鋳鋼などが汎用されているが、これら基
材の表面に上記セラミック被覆層を設けることによって
ロールの耐用寿命は暑しく高められる。基材とセラミッ
ク層との間に両者の中間の大きさの熱膨張係数を持つ中
間層を１層もしくは２層以上設けて被覆安定性をさらに
向上させ得る。The material of the roll to which the ceramic coating is applied is □25
Step 1 of Or-20Ni steel, 25Or-12Ni steel, etc.
Although stainless steel, heat-resistant cast steel, and the like are commonly used, the service life of the roll can be significantly increased by providing the ceramic coating layer on the surface of these base materials. The coating stability can be further improved by providing one or more intermediate layers having a coefficient of thermal expansion intermediate between the base material and the ceramic layer.

次に上記組成のセラミック材料にてロール表面に被覆層
を形成させる方法はガス、プラズマ溶射装置を用いて行
う。他に水プラズマ溶射装置、酸゛素鋼アセチレン炎溶
射装置があるが水プラズマ溶射法ではプラズマジェット
温度が８００００に以上となり高熱源きて成分組成中の
ｓｉｏ、が相の分離と蒸発のため減少してしまい目的の
被覆層とならない。また酸素−アセチレン炎溶射法では
燃焼炎”温度が８０００に前後であるため完全に溶射材
料を溶融状態とせず被覆層の結合力が弱く実用とならな
い。また被覆するセラミックの粉末は１２５μ以下が望
ましい。これはガス、プラズマ溶射法で得られるプラズ
マジェット温度が約１００００になのでその温度で完全
に溶融がなされなおかつＳｉｎ。Next, a coating layer is formed on the roll surface using the ceramic material having the above composition using a gas or plasma spraying device. There are also water plasma spraying equipment and oxygen steel acetylene flame spraying equipment, but in water plasma spraying, the plasma jet temperature exceeds 80,000, a high heat source is generated, and sio in the component composition decreases due to phase separation and evaporation. As a result, the desired coating layer cannot be obtained. In addition, in the oxygen-acetylene flame spraying method, the combustion flame temperature is around 8000°C, so the sprayed material is not completely molten, and the bonding strength of the coating layer is weak, making it impractical. Also, the coating ceramic powder is preferably 125μ or less. This is because the plasma jet temperature obtained by the gas plasma spraying method is about 10,000 ℃, so complete melting can be achieved at that temperature and Sin.

の相分離、蒸発が生じない粒度である。The particle size is such that phase separation and evaporation do not occur.

実施例−１ けい素鋼帯の連続焼鈍炉において２５％Ｏｒ　−２０％
Ｎｉ耐熱合金鋼ロールに、下記のセラミック組成となる
被覆材料を１２１５μ以下の粒度に調整した後方゛ス、
プラズマ溶射装置で溶射被膜を被覆したま一同一部分に
並べて装入し、５ケ月間にわたり同時に比較テストを行
った。その結果を表１に示したように６５％Ｚｒ０２−
８０％Ｓ１０．被膜は良好であ□つたが、５１０２が少
いとぎ、はく離のおそれかありまた９６％Ｚｒ％　＋５
％ＯａＯノ安定化ＺｒＯ２被膜は添加物のために金属粒
、金蜆粉のフレーク状付着で不良であった。またＺｒＯ
の代りにＡｌ２Ｏ８あるいはＡｌＯと’ＩＩ’１０２を
用いたものも悪いことが判゛８ つた。Example-1 25%Or -20% in continuous annealing furnace for silicon steel strip
A Ni heat-resistant alloy steel roll is coated with a coating material having the following ceramic composition adjusted to a grain size of 1215μ or less,
The samples were coated with a thermally sprayed coating using a plasma spraying device and placed side by side on the same area, and a comparative test was conducted simultaneously over a period of 5 months. As the results are shown in Table 1, 65% Zr02-
80%S10. The coating was good, but there was a risk of peeling due to the small amount of 5102, and 96% Zr% +5
% OaO stabilized ZrO2 coating was defective due to flake-like adhesion of metal grains and gold powder due to additives. Also ZrO
It was also found that the use of Al2O8 or AlO and 'II'102 instead of was also bad.

表−１ （１）対象設備　けい素鋼熱処理炉 （２）雰囲気　　　５０％Ｈ２−５０％Ｎ２（８）温度
　　　　ＳＯＯ〜８５０”Ｃ（４）ロール寸法　　１ｌ
１１０φｘ２０００１実施例−２ 実施例−１と同一条件で比較テストを行ったがその結果
を表−２に示すように制限をこえたＱａＯ。Table-1 (1) Target equipment Silicon steel heat treatment furnace (2) Atmosphere 50%H2-50%N2 (8) Temperature SOO~850"C (4) Roll size 1l
110φx20001 Example-2 A comparative test was conducted under the same conditions as Example-1, but the QaO exceeded the limits as shown in Table-2.

’ｇＯａ　ＦｅｇＯａが付着の原因になっていることが
判る。'gOa It can be seen that FegOa is the cause of adhesion.

１１　　。11.

実施例−８ 基材として５ＧＨ１８を用い、その表面に実施例−１と
同一のセラミックを１２５μ以下の粒度に調整した後、
窒業ガスを生体としたガス、プラズマ溶射装置で０．４
闘厚さに被ＦＩＲＭを形成させ、さらに研暦仕上げした
ロールをけい業鋼帯の連続熱処理炉に取付は使用したと
ころ５ケ月経過彼にもビルドアップの発生が全くなく、
またｔｍ層のはく離、亀裂等も皆無であり、従来の被筒
しないＳｏｎ　１８製ロールに比べて２倍以上の耐用寿
命が得パられた。Example-8 Using 5GH18 as a base material, the same ceramic as in Example-1 was applied to the surface of the base material, and the particle size was adjusted to 125μ or less.
0.4 using nitrogenous gas as a biological gas, plasma spraying equipment
After 5 months of using the roll, which was coated with FIRM and finished with a Kenreki finish, in a continuous heat treatment furnace for steel strips, he did not experience any build-up.
Furthermore, there was no peeling or cracking of the TM layer, and the service life was more than twice as long as that of the conventional Son 18 roll without a jacket.

実施例−４ 基材として熱膨張係数１５Ｘ１０／’Ｃの５ＯＨ２２を
用いたロールの胴周に熱膨張係数が１８ＸｌＯ””／”
Ｃの８０％Ｎｊ−２０％Ｏｒ糸金属土金属る下地溶射□
層を０．２ｇ＋ａｌし１、その上に実施例−１と同一の
セラミック（熱膨張係数８Ｘ１０／”Ｃ）浴射被握を形
成する被覆材料を１２６μ以下の粒度に調整した後、窒
素ガスを主体としたガス、プラズマ浴射装置で厚さ０　
＊　６　ａｍに被積層を杉成し、ωを磨仕上げ□゛、１
２ したロールをけい素調帯の連続熱処理炉に取付は使用し
たところ８ケ月経過後にも何らビルドアップはｋめられ
ず、被ａ１層の亀裂、はく離等も全くなく比較用のＺｒ
Ｏ、装置ロールに比べて１．５倍以上の耐用寿命が得ら
れた。Example-4 The circumference of a roll using 5OH22 with a thermal expansion coefficient of 15X10/'C as a base material has a thermal expansion coefficient of 18X1O""/"
C 80%Nj-20%Or thread metal soil metal base thermal spraying □
A layer of 0.2 g+aluminum 1 was coated with the same ceramic (coefficient of thermal expansion 8 x 10/''C) as in Example 1 to form a coating material, adjusted to a particle size of 126μ or less, and then nitrogen gas was added. Thickness 0 with gas and plasma irradiation equipment
* 6 am to be laminated and ω polished □゛, 1
2. When the rolled Zr roll was installed in a continuous heat treatment furnace for silicon tone zone and used, no build-up was observed even after 8 months had passed, and there was no cracking or peeling of the A1 layer, compared to the Zr for comparison.
O, a service life of 1.5 times or more was obtained compared to the device roll.

実施例−５ 基材として熱膨張係数１５Ｘ１０　　／℃の５ＯＨ２２
を用い８０％Ｎｉ　−２０％Ｏｒの金属下地Ｎ（熱膨張
係数１８ｘｌＯ／”（）および８０％Ｎｉ　−２０％Ｏ
ｒ合金とＺｒＳ　ｉＯ４との重量比１：１の組成になる
サーメット下地被覆層（熱膨張係数９Ｘ１０　　／”Ｃ
）を各々０．２關づつ溶射形成し、その表面に実施例−
１と同一の被筒材料を１２５μ以下の粒度に調整した後
、窒＃ガスを主体としたガス、プラズマ溶射装置で厚さ
０．４闘にセラミック被櫨層を形成し、研磨仕”上げし
たロールをけい＊ｓｉ帯の連続熱処理炉に取付は使用し
たところ１５ケ月経過後にも何らのビルドアップも紹め
られず被Ｍｅの亀裂やはく陰も全くなく、従来の５ＯＩ
（ｌ！ロールに比べて４倍以上の耐用寿命が得られた。Example-5 5OH22 with a thermal expansion coefficient of 15X10/°C as a base material
using 80%Ni-20%Or metal base N (thermal expansion coefficient 18xlO/''() and 80%Ni-20%O
A cermet undercoating layer with a composition of r alloy and ZrSiO4 in a weight ratio of 1:1 (thermal expansion coefficient 9X10/"C)
) was thermally sprayed in an amount of 0.2 mm each, and the Example-
After adjusting the particle size of the same cladding material as 1 to 125 μ or less, a ceramic cladding layer was formed to a thickness of 0.4 mm using a gas and plasma spraying device mainly composed of nitrogen gas, and a polishing finish was applied. When the roll was installed and used in a continuous heat treatment furnace in the K*SI band, no build-up was observed even after 15 months, and there were no cracks or shading on the surface of the metal, compared to the conventional 5OI.
(It has a service life that is more than four times that of the l! roll.

以上のように、この発明によれば、鋼帯が持込・む金属
粉や金絢酸化物のロール表面への凝着性が大幅に低下す
るのでロールの連続使用期間が大＋１１１４に長くなり
、操業の安定あるいはロールの再研磨コストの低下に太
きく貢献できるなど大きな効果全奏する。As described above, according to the present invention, the adhesion of metal powder and gold oxide carried by the steel strip to the roll surface is significantly reduced, so that the continuous use period of the roll can be extended by +1114 times. It has great effects, such as contributing significantly to operational stability and lowering the cost of regrinding rolls.

【図面の簡単な説明】[Brief explanation of drawings]

第１図はＳｉｎｇ−ＺｒＯ，糸セラミック浴射被箇層の
ＳｉＯ□含有飄と粒子間結合力の関係を示すグラフ、 第２図はＳｉｎ、　−Ｚｒ０ｇ系セラミック浴躬被置層
装層厚と耐熱衝撃性の関係を示すグラフである。Figure 1 is a graph showing the relationship between the SiO□ content of the Sing-ZrO and thread ceramic bath coating layer and the interparticle bonding force. It is a graph showing the relationship between thermal shock resistance.

Claims (1)

【特許請求の範囲】 Ｌ　耐熱合金より成るロール材の胴周表面に、＋Ｍ　化
ジルコニウムを主体とするセラ主ツク溶射被膜を形成し
た刷板の島渇熱処坤炉用ハースロールにおいて、該溶射
被膜が、酸化ジルコニウムの安定剤１１％以下を含みか
つ、Ｓ１０．換算で少くとも２５重普％を占める酸化け
い禦を％　ＺｒＯｓ換算の戯化ジルコニウムとの１合計
で、８ｆｉ重鼠％以上を含有する組成に成ることを特徴
とする尚温熱処畑炉用ハースロール０ λ　浴帽鋏腺が、厚み０．１〜１．０鉢の虻囲であるｌ
記載のハースロール。 ＆　洛豹択膜かロール材の熱膨張係数よりも太き（語側
扱駒のそれよりも小さい熱ｗ張係数の側熱合金層よりな
る下地溶射被覆をそなえるｌまたは２記載のハースロー
ル。[Scope of Claims] A hearth roll for use in a heat treatment furnace for plate plates, in which a ceramic-based thermal sprayed coating mainly composed of +M zirconium chloride is formed on the circumferential surface of a roll material made of an L heat-resistant alloy. the coating contains 11% or less of a zirconium oxide stabilizer, and S10. A hearth for a still-temperature field furnace, characterized in that it has a composition containing at least 8% silicon oxide in terms of ZrOs and oxidized zirconium, which accounts for at least 25% in terms of ZrOs. Roll 0 λ The bathcap chelicerae are 0.1 to 1.0 pot thick.
Hearth roll as described. & The hearth roll according to item 1 or 2, comprising a base thermal spray coating consisting of a side thermal alloy layer having a thermal expansion coefficient thicker than the thermal expansion coefficient of the roll material (less than that of the side piece).