JPH07316773A - Thermally sprayed alumina film having electrical insulation characteristic and its production - Google Patents
Thermally sprayed alumina film having electrical insulation characteristic and its productionInfo
- Publication number
- JPH07316773A JPH07316773A JP6116249A JP11624994A JPH07316773A JP H07316773 A JPH07316773 A JP H07316773A JP 6116249 A JP6116249 A JP 6116249A JP 11624994 A JP11624994 A JP 11624994A JP H07316773 A JPH07316773 A JP H07316773A
- Authority
- JP
- Japan
- Prior art keywords
- polymer
- metal alkoxide
- sprayed coating
- thermally sprayed
- alumina
- 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.)
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Links
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- Coating By Spraying Or Casting (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、満足できる電気絶縁性
を有するアルミナ溶射皮膜を製造する方法、及び得られ
たアルミナ溶射皮膜に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an alumina sprayed coating having a satisfactory electric insulating property, and the obtained alumina sprayed coating.
【０００２】[0002]
【従来技術及びその問題点】プラズマ溶射して得られる
アルミナ溶射皮膜は、厚さを５００μｍ以上としなけれ
ば、電気絶縁性を有するものとはならない。しかし、厚
さ５００μｍ以上のアルミナ溶射皮膜を得ようとする
と、冷却中に割れ、剥離が生じるため、現実には得られ
ない。2. Description of the Related Art Alumina sprayed coatings obtained by plasma spraying do not have electrical insulation unless the thickness is 500 μm or more. However, if an attempt is made to obtain an alumina sprayed coating having a thickness of 500 μm or more, cracking and peeling will occur during cooling, which is not practically possible.
【０００３】[0003]
【発明の目的】本発明は、満足できる電気絶縁性を有す
るアルミナ溶射皮膜を確実に得ることができる製造方法
を提供すること、及び満足できる電気絶縁性を有するア
ルミナ溶射皮膜を提供することを目的とする。OBJECTS OF THE INVENTION It is an object of the present invention to provide a manufacturing method capable of reliably obtaining an alumina sprayed coating having a satisfactory electric insulating property, and to provide an alumina sprayed coating having a satisfactory electrical insulating property. And
【０００４】[0004]
【目的を達成するための手段】本願の第１の発明の電気
絶縁性アルミナ溶射皮膜の製造方法は、所定の温度制御
下で、母材表面にアルミナ粉体をプラズマ溶射して、厚
さ５００μｍ以上の溶射皮膜を形成し、上記所定の温度
制御は、漸次得られる溶射皮膜の表面温度を１００℃以
上２００℃以下の範囲内に制御するものであり、形成さ
れた溶射皮膜を、３５℃以上７５℃以下の範囲内まで放
冷し、金属アルコキシドの重合体の溶液中に浸漬するだ
けで上記溶射皮膜の気孔中に上記金属アルコキシドの重
合体を侵入させ、上記溶液中から引き上げて風乾させる
ことにより更に上記金属アルコキシドの重合体の加水分
解と重合を進行させた後、焼成することを特徴としてい
る。The method for producing an electrically insulating alumina sprayed coating of the first invention of the present application is such that an alumina powder is plasma sprayed on a surface of a base material under a predetermined temperature control to obtain a thickness of 500 μm. The above thermal spray coating is formed, and the predetermined temperature control is to gradually control the surface temperature of the thermal spray coating obtained within the range of 100 ° C. or higher and 200 ° C. or lower. Allowing the polymer of the metal alkoxide to penetrate into the pores of the thermal spray coating by simply cooling it to a temperature within the range of 75 ° C. or lower and immersing it in the solution of the polymer of the metal alkoxide, and pulling it out of the solution and air drying. According to the above method, the polymer of the metal alkoxide is further hydrolyzed and polymerized, and then baked.
【０００５】本願の第２の発明の電気絶縁性アルミナ溶
射皮膜の製造方法は、所定の温度制御下で、母材表面に
アルミナ粉体をプラズマ溶射して、厚さ５００μｍ以上
の溶射皮膜を形成し、上記所定の温度制御は、漸次得ら
れる溶射皮膜の表面温度を１００℃以上２００℃以下の
範囲内に制御するものであり、形成された溶射皮膜を、
３５℃以上７５℃以下の範囲内まで放冷し、金属アルコ
キシドの重合体の溶液中に浸漬して陽極とし、その溶液
中に浸した陰極との間に電流を流し電気泳動によって上
記溶射皮膜の気孔中に上記金属アルコキシドの重合体を
侵入させ、上記溶液中から引き上げて風乾させることに
より更に上記金属アルコキシドの重合体の加水分解と重
合を進行させた後、焼成することを特徴としている。In the method for producing an electrically insulating alumina sprayed coating of the second invention of the present application, alumina powder is plasma sprayed on the surface of the base material under a predetermined temperature control to form a sprayed coating having a thickness of 500 μm or more. However, the predetermined temperature control is to gradually control the surface temperature of the spray coating obtained within the range of 100 ° C. or higher and 200 ° C. or lower.
It is allowed to cool to a range of 35 ° C. or higher and 75 ° C. or lower, and it is immersed in a solution of a polymer of metal alkoxide to form an anode. It is characterized in that the polymer of the metal alkoxide is allowed to enter the pores, is pulled out of the solution and is air-dried to further promote the hydrolysis and polymerization of the polymer of the metal alkoxide, and then is baked.
【０００６】本願の第３の発明の電気絶縁性アルミナ溶
射皮膜は、気孔中に金属酸化物が充填されている、厚さ
５００μｍ以上のアルミナ溶射皮膜からなることを特徴
としている。The electrically insulating alumina sprayed coating of the third invention of the present application is characterized in that it comprises an alumina sprayed coating having a thickness of 500 μm or more in which pores are filled with a metal oxide.
【０００７】金属アルコキシドとしては、「ゾル−ゲル
法の科学」（著者：作花済夫、発行所：株式会社アグネ
承風社、発行日：１９８８年７月５日）の２０頁の表
３．２に記載のものを用い得る。例えば、Ａｌ（ＯＣ3
Ｈ7）4、Ｓｉ（ＯＣ2Ｈ5）4、Ｔｉ（ＯＣＨ3）4、Ｚｒ
（ＯＣ4Ｈ9）4等がある。As metal alkoxides, Table 3 on page 20 of "Science of Sol-Gel Method" (author: Sakuhana Saku, publisher: Agne Chengfu Co., Ltd., issue date: July 5, 1988). 2 can be used. For example, Al (OC 3
H 7 ) 4 , Si (OC 2 H 5 ) 4 , Ti (OCH 3 ) 4 , Zr
(OC 4 H 9 ) 4 etc.
【０００８】金属アルコキシドの重合体の溶液は、金属
アルコキシドを水を含んだアルコール及び適量の酸の混
合溶液中に溶解させて調製する。The metal alkoxide polymer solution is prepared by dissolving the metal alkoxide in a mixed solution of an alcohol containing water and an appropriate amount of acid.
【０００９】上記第１の発明では浸漬するだけで、ま
た、上記第２の発明では電気泳動することによって、ア
ルミナ溶射皮膜の気孔中へ金属アルコキシドの重合体を
侵入させている。The polymer of the metal alkoxide penetrates into the pores of the alumina sprayed coating by only dipping in the first aspect of the invention and by electrophoresis in the second aspect of the invention.
【００１０】電気泳動は、例えば図１に示すような装置
で行なう。図において、１０は電源、１１は陽極である
アルミナ溶射皮膜、１２は陰極、１３は容器１４内の金
属アルコキシドの重合体の溶液である。Electrophoresis is carried out, for example, by a device as shown in FIG. In the figure, 10 is a power source, 11 is an alumina sprayed coating which is an anode, 12 is a cathode, and 13 is a solution of a polymer of metal alkoxide in a container 14.
【００１１】風乾即ち空気中に晒す時間は、付着した金
属アルコキシドの重合体の加水分解と重合が更に進行し
て略完了するまでとする。The time for air-drying, that is, the time of exposure to air, is until the hydrolysis and the polymerization of the adhered polymer of the metal alkoxide further proceed to the completion.
【００１２】焼成は通常の方法により行なう。Firing is performed by a usual method.
【００１３】[0013]
【作用】金属アルコキシドを水を含んだアルコール及び
適量の酸の混合溶液中に溶解させると、金属アルコキシ
ドは部分的に加水分解された状態で重合し、溶液中には
金属アルコキシドの重合体が生成する。この金属アルコ
キシドの重合体は、数分子の金属アルコキシドの金属同
士が酸素を介して結合し、金属には未だアルコキシル基
が結合してなるものである。金属アルコキシドの重合体
は、風乾すると、空気中の水分により更に加水分解が進
行すると同時に重合が進行し、また、アルコールが蒸発
し、焼成すると、金属酸化物となる。[Function] When a metal alkoxide is dissolved in a mixed solution of alcohol containing water and an appropriate amount of acid, the metal alkoxide is polymerized in a partially hydrolyzed state, and a polymer of the metal alkoxide is formed in the solution. To do. This polymer of metal alkoxide is a polymer in which several metal alkoxide metals are bonded to each other through oxygen, and an alkoxyl group is still bonded to the metal. When a polymer of a metal alkoxide is air-dried, hydrolysis is further promoted by moisture in the air and at the same time, polymerization is further progressed, and when alcohol is evaporated and baked, it becomes a metal oxide.
【００１４】プラズマ溶射して得られたアルミナ溶射皮
膜を、金属アルコキシドの重合体の溶液中に、浸漬する
と、又は浸漬して電気泳動を行なうと、アルミナ溶射皮
膜の気孔中に金属アルコキシドの重合体が侵入する。侵
入した金属アルコキシドの重合体は、その後の風乾及び
焼成により金属酸化物となる。即ち、アルミナ溶射皮膜
の気孔は金属酸化物で充填される。When an alumina sprayed coating obtained by plasma spraying is immersed in a solution of a polymer of a metal alkoxide, or when immersed and electrophoresed, a polymer of a metal alkoxide is present in the pores of the alumina sprayed coating. Invades. The intruded polymer of the metal alkoxide becomes a metal oxide by subsequent air drying and firing. That is, the pores of the alumina sprayed coating are filled with the metal oxide.
【００１５】プラズマ溶射の際、漸次得られる溶射皮膜
の表面温度が１００℃より低くなるよう制御すると、ア
ルミナ溶射皮膜は殆んど形成されない。また、２００℃
より高くなるよう制御すると、後工程における放冷中に
アルミナ溶射皮膜に割れ、剥離が生じる。本発明では、
１００℃以上２００℃以下の範囲内に制御しているの
で、厚さ５００μｍ以上のアルミナ溶射皮膜が剥離等を
生じることなく得られる。従って、電気絶縁性を有する
アルミナ溶射皮膜が得られる。なお、プラズマ溶射で得
られたアルミナ溶射皮膜には、目視できない程度の大き
さの気孔が多数存在している。During plasma spraying, if the surface temperature of the sprayed coating gradually obtained is controlled to be lower than 100 ° C., almost no alumina sprayed coating is formed. Also, 200 ℃
If it is controlled to be higher, the alumina sprayed coating will crack and peel during cooling in the subsequent step. In the present invention,
Since the temperature is controlled within the range of 100 ° C. or more and 200 ° C. or less, the alumina sprayed coating having a thickness of 500 μm or more can be obtained without peeling or the like. Therefore, an alumina sprayed coating having electrical insulation can be obtained. It should be noted that the alumina sprayed coating obtained by plasma spraying has a large number of pores that are invisible to the naked eye.
【００１６】なお、上記のような温度制御を行ないなが
らプラズマ溶射により溶射皮膜を形成する作業は、図２
及び図３に示すように行なう。まず、図２に示すよう
に、母材１表面をプラズマの熱により２００℃〜２５０
℃まで加温する。次に、図３に示すように、母材１表面
にアルミナ粉体をプラズマ溶射する。プラズマ溶射は、
溶射サイクルを繰返して行なうが、溶射サイクル毎に得
られる溶射皮膜１１ａの表面温度が１００℃以上２００
℃以下となるよう、溶射サイクルや冷却エアーによって
温度制御しながら行なう。溶射皮膜１１ａ表面の温度測
定は、温度計２０のプローブ２１を溶射皮膜表面に接触
させることにより行なう。The operation of forming the sprayed coating by plasma spraying while controlling the temperature as described above is shown in FIG.
And as shown in FIG. First, as shown in FIG. 2, the surface of the base material 1 is heated to 200 ° C. to 250 ° C. by plasma heat.
Heat to ℃. Next, as shown in FIG. 3, alumina powder is plasma sprayed on the surface of the base material 1. Plasma spraying
The spraying cycle is repeated, but the surface temperature of the sprayed coating 11a obtained in each spraying cycle is 100 ° C. or higher and 200 or more.
The temperature is controlled by a thermal spraying cycle or cooling air so that the temperature becomes ℃ or less. The temperature of the surface of the thermal spray coating 11a is measured by bringing the probe 21 of the thermometer 20 into contact with the surface of the thermal spray coating.
【００１７】プラズマ溶射で形成されたアルミナ溶射皮
膜を３５℃より低い温度まで放冷して作業を進めると、
満足できる絶縁性を有するものは得られない。７５℃よ
り高い温度の場合には、アルミナ溶射皮膜に割れ、剥離
が生じる。この理由は、次のように考えられる。即ち、
一般に、溶液の温度より高い温度の溶射皮膜を溶液中に
浸漬すると、当然に溶射皮膜の温度は低下するが、この
とき、溶射皮膜の気孔中の空気も冷やされ、そのために
溶液が吸い込まれるようにして気孔中に入る。しかし、
溶液の温度が高すぎると、熱衝撃が生じ、溶射皮膜に割
れ、剥離が生じる。本発明では、放冷温度を３５℃以上
に設定しているので、アルミナ溶射皮膜の気孔には金属
アルコキシドの重合体の溶液が充分に侵入し、気孔は金
属酸化物により充填される。従って、満足できる絶縁性
を有するアルミナ溶射皮膜が得られる。しかも、放冷温
度を７５℃以下に設定しているので、アルミナ溶射皮膜
が剥離等を生じることなく得られる。When the alumina sprayed coating formed by plasma spraying is allowed to cool to a temperature lower than 35 ° C. and the work proceeds,
It is not possible to obtain a material having a satisfactory insulating property. When the temperature is higher than 75 ° C, the alumina sprayed coating is cracked and peeled off. The reason for this is considered as follows. That is,
Generally, when a thermal spray coating having a temperature higher than the temperature of the solution is immersed in the solution, the temperature of the thermal spray coating naturally lowers, but at this time, the air in the pores of the thermal spray coating is also cooled, so that the solution may be sucked in. Then enter the pores. But,
If the temperature of the solution is too high, thermal shock occurs and the sprayed coating cracks and peels off. In the present invention, the cooling temperature is set to 35 ° C. or higher, so that the solution of the polymer of the metal alkoxide sufficiently penetrates into the pores of the alumina sprayed coating, and the pores are filled with the metal oxide. Therefore, an alumina sprayed coating having a satisfactory insulating property can be obtained. Moreover, since the cooling temperature is set to 75 ° C. or lower, the alumina sprayed coating can be obtained without peeling or the like.
【００１８】図１において、陽極であるアルミナ溶射皮
膜１１と陰極１２との間に電源１０から電流を流すと、
電気泳動によって、金属アルコキシドの重合体は溶射皮
膜１１の方へ移動して、溶射皮膜１１の気孔中に侵入し
ていく。電気泳動であるので、金属アルコキシドの重合
体は、溶射皮膜１１の全ての気孔中に充分に侵入してい
く。In FIG. 1, when a current is supplied from the power supply 10 between the anode thermal sprayed alumina coating 11 and the cathode 12,
Due to the electrophoresis, the polymer of metal alkoxide moves toward the sprayed coating 11 and penetrates into the pores of the sprayed coating 11. Since it is electrophoresis, the polymer of metal alkoxide sufficiently penetrates into all the pores of the thermal spray coating 11.
【００１９】[0019]
（実施例１）アルミニウム合金材（Ａ５０８３Ｐ−Ｏ
材）からなる母材表面をブラスト処理し、その母材表面
に、ホワイトアルミナ（α−Ａｌ2Ｏ3、純度９９．６
％、平均粒径約２０μｍ）を出力２５０ｋＷでプラズマ
溶射し、厚さ約６００μｍの溶射皮膜を形成した。な
お、プラズマ溶射の際において、漸次得られる溶射皮膜
の表面温度が常に１６０〜１９０℃の範囲内となるよう
制御した。(Example 1) Aluminum alloy material (A5083P-O
Blast treatment is performed on the surface of the base material made of white material, and white alumina (α-Al 2 O 3 , purity 99.6 is formed on the surface of the base material.
%, Average particle size of about 20 μm) was plasma sprayed at an output of 250 kW to form a sprayed coating having a thickness of about 600 μm. During plasma spraying, the surface temperature of the sprayed coating that was gradually obtained was controlled so as to always be within the range of 160 to 190 ° C.
【００２０】一方、シリコンアルコキシド（Ｓｉ（ＯＣ
2Ｈ5）4）５９ｍｌと、エタノール１１９ｍｌと、水５
９ｍｌとを混合し、この混合液に、９８％硫酸０．２ｍ
ｌを添加して、シリコンアルコキシドの重合体の溶液を
調整した。On the other hand, silicon alkoxide (Si (OC
59 ml of 2 H 5 ) 4 ), 119 ml of ethanol, and water 5
9 ml was mixed, and this mixed solution was mixed with 0.2 m of 98% sulfuric acid.
1 was added to prepare a solution of a polymer of silicon alkoxide.
【００２１】そして、上記溶射皮膜を、５０℃まで放冷
し、上記重合体の溶液に５分間浸漬した後、引き上げ、
メタノールに浸漬後、水洗し、３０分間風乾させた後、
電気炉で、２００℃、１時間熱処理した。Then, the thermal spray coating was allowed to cool to 50 ° C., immersed in the polymer solution for 5 minutes, and then withdrawn.
After soaking in methanol, washing with water and air-drying for 30 minutes,
It heat-processed at 200 degreeC for 1 hour with an electric furnace.
【００２２】得られた溶射皮膜に対し、ＪＩＳ−Ｃ２１
１０に基づく絶縁破壊試験を行なった。その結果、絶縁
破壊電圧は、油中で５．５〜６．０ｋＶ、気中で３．５
〜４．０ｋＶであった。JIS-C21 was applied to the obtained thermal spray coating.
A dielectric breakdown test based on 10 was conducted. As a result, the breakdown voltage was 5.5 to 6.0 kV in oil and 3.5 in air.
Was about 4.0 kV.
【００２３】放冷温度の検討 溶射皮膜の放冷温度を種々設定し、その他は実施例１と
同様に行ない、得られた溶射皮膜に対して同様の試験を
行なった。その結果を表１に示す。 Examination of cooling temperature The cooling temperature of the thermal spray coating was variously set, the other conditions were the same as in Example 1, and the same test was performed on the obtained thermal spray coating. The results are shown in Table 1.
【００２４】[0024]
【表１】 [Table 1]
【００２５】実施例１及び表１からわかるように、放冷
温度が３５℃以上７５℃以下の範囲内である場合には、
満足できる絶縁性が得られた。As can be seen from Example 1 and Table 1, when the cooling temperature is in the range of 35 ° C to 75 ° C,
Satisfactory insulation was obtained.
【００２６】溶射皮膜表面温度の検討 溶射皮膜の表面温度を種々設定し、その他は実施例１と
同様に行ない、得られた溶射皮膜に対して同様の試験を
行なった。その結果を表２に示す。 Examination of the surface temperature of the sprayed coating The surface temperature of the sprayed coating was variously set, the other conditions were the same as in Example 1, and the same test was performed on the obtained sprayed coating. The results are shown in Table 2.
【００２７】[0027]
【表２】 [Table 2]
【００２８】実施例１及び表２からわかるように、１０
０℃以上２００℃以下の範囲内でプラズマ溶射した場合
には、良好に溶射皮膜を得ることができた。As can be seen from Example 1 and Table 2, 10
When plasma spraying was performed within the range of 0 ° C. or higher and 200 ° C. or lower, a sprayed coating could be obtained satisfactorily.
【００２９】（実施例２）純アルミニウム材（Ａ１１０
０Ｐ−２４材）からなる母材表面をブラスト処理し、そ
の母材表面に、ホワイトアルミナ（α−Ａｌ2Ｏ3、純度
９９．６％、平均粒径約１０μｍ）を出力２５０ｋＷで
プラズマ溶射し、厚さ約８５０μｍの溶射皮膜を形成し
た。なお、プラズマ溶射の際において、漸次得られる溶
射皮膜の表面温度が常に１４０〜１６５℃の範囲内とな
るよう制御した。(Example 2) Pure aluminum material (A110
The base material surface made of 0P-24 material) is blasted, and white alumina (α-Al 2 O 3 , purity 99.6%, average particle size of about 10 μm) is plasma sprayed on the base material surface at an output of 250 kW. A sprayed coating having a thickness of about 850 μm was formed. During plasma spraying, the surface temperature of the sprayed coating gradually obtained was controlled so as to always fall within the range of 140 to 165 ° C.
【００３０】一方、アルミニウムアルコキシド（Ａｌ
（ＯＣ3Ｈ7）3）５９ｍｌと、エタノール１１９ｍｌ
と、水５９ｍｌとを混合し、この混合液に、９８％硫酸
０．２ｍｌを添加して、アルミニウムアルコキシドの重
合体の溶液を調整した。On the other hand, aluminum alkoxide (Al
(OC 3 H 7 ) 3 ) 59 ml and ethanol 119 ml
And 59 ml of water were mixed, and 0.2 ml of 98% sulfuric acid was added to this mixed solution to prepare a solution of a polymer of aluminum alkoxide.
【００３１】そして、上記溶射皮膜を、４０℃まで放冷
し、上記重合体の溶液に浸漬して陽極とし、チタン板を
陰極として、両極間に直流電圧５０Ｖを３分間印加し
た。その後、引き上げ、メタノールに浸漬後、水洗し、
３０分間風乾させた後、電気炉で、２５０℃、１時間熱
処理した。The sprayed coating was allowed to cool to 40 ° C., immersed in a solution of the polymer as an anode, a titanium plate as a cathode, and a DC voltage of 50 V was applied between the electrodes for 3 minutes. Then, pull up, soak in methanol, then wash with water,
After air-drying for 30 minutes, it was heat-treated in an electric furnace at 250 ° C. for 1 hour.
【００３２】得られた溶射皮膜に対し、ＪＩＳ−Ｃ２１
１０に基づく絶縁破壊試験を行なった。その結果、絶縁
破壊電圧は、油中で６．５〜７．５ｋＶ、気中で４．５
〜５．５ｋＶであった。JIS-C21 was applied to the obtained thermal spray coating.
A dielectric breakdown test based on 10 was conducted. As a result, the breakdown voltage was 6.5 to 7.5 kV in oil and 4.5 in air.
Was about 5.5 kV.
【００３３】放冷温度の検討 溶射皮膜の放冷温度を種々設定し、その他は実施例２と
同様に行ない、得られた溶射皮膜に対して同様の試験を
行なった。その結果を表３に示す。 Examination of cooling temperature The cooling temperature of the thermal spray coating was variously set, and the other conditions were the same as in Example 2, and the same test was conducted on the obtained thermal spray coating. The results are shown in Table 3.
【００３４】[0034]
【表３】 [Table 3]
【００３５】実施例２及び表３からわかるように、放冷
温度が３５℃以上７５℃以下の範囲内である場合には、
満足できる絶縁性が得られた。As can be seen from Example 2 and Table 3, when the cooling temperature is in the range of 35 ° C. or higher and 75 ° C. or lower,
Satisfactory insulation was obtained.
【００３６】溶射皮膜表面温度の検討 溶射皮膜の表面温度を種々設定し、その他は実施例２と
同様に行ない、得られた溶射皮膜に対して同様の試験を
行なった。その結果を表４に示す。 Examination of the surface temperature of the sprayed coating The surface temperature of the sprayed coating was variously set, and the other conditions were the same as in Example 2, and the same test was performed on the obtained sprayed coating. The results are shown in Table 4.
【００３７】[0037]
【表４】 [Table 4]
【００３８】実施例２及び表４からわかるように、１０
０℃以上２００℃以下の範囲内でプラズマ溶射した場合
には、良好に溶射皮膜を得ることができた。As can be seen from Example 2 and Table 4, 10
When plasma spraying was performed within the range of 0 ° C. or higher and 200 ° C. or lower, a sprayed coating could be obtained satisfactorily.
【００３９】[0039]
【発明の効果】以上のように、本願発明によれば、次の
ような効果を奏する。 （１）請求項１及び請求項２に記載の発明によれば、特
に、プラズマ溶射の際の溶射皮膜の表面温度を１００℃
以上２００℃以下に、また、放冷温度を３５℃以上７５
℃以下に、それぞれ制御したので、満足できる電気絶縁
性を有するアルミナ溶射皮膜を得ることができる。As described above, according to the present invention, the following effects can be obtained. (1) According to the inventions of claims 1 and 2, particularly, the surface temperature of the sprayed coating during plasma spraying is 100 ° C.
Above 200 ℃, and the cooling temperature is above 35 ℃ 75
Since the temperature was controlled to be not higher than 0 ° C., it is possible to obtain an alumina sprayed coating having a satisfactory electric insulating property.
【００４０】（２）請求項３記載の発明によれば、厚さ
が５００μｍ以上あり、気孔が金属酸化物で充填されて
いるので、満足できる電気絶縁性を発揮できる。(2) According to the third aspect of the invention, the thickness is 500 μm or more, and the pores are filled with the metal oxide, so that satisfactory electrical insulation can be exhibited.
【図１】 電気泳動を行なうための装置を示す模式断面
図である。FIG. 1 is a schematic cross-sectional view showing an apparatus for performing electrophoresis.
【図２】 プラズマ溶射の作業を示す斜視図である。FIG. 2 is a perspective view showing a plasma spraying operation.
【図３】 プラズマ溶射の作業を示す斜視図である。FIG. 3 is a perspective view showing a plasma spraying operation.
１１ アルミナ溶射皮膜 １３ 金属アルコキシドの重合体の溶液 11 Alumina sprayed coating 13 Solution of polymer of metal alkoxide
───────────────────────────────────────────────────── フロントページの続き (72)発明者 田辺 修治 大阪府大阪市淀川区三国本町３丁目９番39 号 株式会社日本アルミ内 (72)発明者 萩野 清二 大阪府大阪市淀川区三国本町３丁目９番39 号 株式会社日本アルミ内 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Shuji Tanabe 3-939 Mikuni Honcho, Yodogawa-ku, Osaka City, Osaka Prefecture Nihon Aluminum Co., Ltd. (72) Seiji Hagino 3-chome, Mikuni Honcho, Yodogawa-ku, Osaka City, Osaka Prefecture No. 39 No. 39 In Nippon Aluminum Co., Ltd.
Claims (3)
ナ粉体をプラズマ溶射して、厚さ５００μｍ以上の溶射
皮膜を形成し、上記所定の温度制御は、漸次得られる溶
射皮膜の表面温度を１００℃以上２００℃以下の範囲内
に制御するものであり、 形成された溶射皮膜を、３５℃以上７５℃以下の範囲内
まで放冷し、金属アルコキシドの重合体の溶液中に浸漬
するだけで上記溶射皮膜の気孔中に上記金属アルコキシ
ドの重合体を侵入させ、上記溶液中から引き上げて風乾
させることにより更に上記金属アルコキシドの重合体の
加水分解と重合を進行させた後、焼成することを特徴と
する電気絶縁性アルミナ溶射皮膜の製造方法。1. Under a predetermined temperature control, alumina powder is plasma sprayed on the surface of a base material to form a spray coating having a thickness of 500 μm or more, and the predetermined temperature control is performed by gradually obtaining the surface of the spray coating. The temperature is controlled within the range of 100 ° C to 200 ° C. The formed thermal spray coating is allowed to cool to within the range of 35 ° C to 75 ° C and immersed in the solution of the metal alkoxide polymer. Only by injecting the polymer of the metal alkoxide into the pores of the sprayed coating, pulling out from the solution and air-drying to further advance the hydrolysis and polymerization of the polymer of the metal alkoxide, and then to bake. A method for producing an electrically insulating alumina sprayed coating, characterized by:
ナ粉体をプラズマ溶射して、厚さ５００μｍ以上の溶射
皮膜を形成し、上記所定の温度制御は、漸次得られる溶
射皮膜の表面温度を１００℃以上２００℃以下の範囲内
に制御するものであり、 形成された溶射皮膜を、３５℃以上７５℃以下の範囲内
まで放冷し、金属アルコキシドの重合体の溶液中に浸漬
して陽極とし、その溶液中に浸した陰極との間に電流を
流し電気泳動によって上記溶射皮膜の気孔中に上記金属
アルコキシドの重合体を侵入させ、上記溶液中から引き
上げて風乾させることにより更に上記金属アルコキシド
の重合体の加水分解と重合を進行させた後、焼成するこ
とを特徴とする電気絶縁性アルミナ溶射皮膜の製造方
法。2. An alumina powder is plasma sprayed on the surface of the base material under a predetermined temperature control to form a sprayed coating having a thickness of 500 μm or more, and the predetermined temperature control is performed by gradually obtaining the surface of the sprayed coating. The temperature is controlled within the range of 100 ° C to 200 ° C. The formed thermal spray coating is allowed to cool to within the range of 35 ° C to 75 ° C and immersed in the solution of the metal alkoxide polymer. As an anode, a current is made to flow between the cathode and the cathode soaked in the solution, and the polymer of the metal alkoxide is introduced into the pores of the sprayed coating by electrophoresis, and further pulled up from the solution and air-dried. A method for producing an electrically insulating alumina sprayed coating, which comprises firing after allowing hydrolysis and polymerization of a polymer of a metal alkoxide to proceed.
厚さ５００μｍ以上のアルミナ溶射皮膜からなることを
特徴とする電気絶縁性アルミナ溶射皮膜。3. The metal oxide is filled in the pores,
An electrically insulating alumina sprayed coating comprising an alumina sprayed coating having a thickness of 500 μm or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6116249A JP2875158B2 (en) | 1994-05-30 | 1994-05-30 | Method for producing electrically insulating alumina sprayed coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6116249A JP2875158B2 (en) | 1994-05-30 | 1994-05-30 | Method for producing electrically insulating alumina sprayed coating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07316773A true JPH07316773A (en) | 1995-12-05 |
| JP2875158B2 JP2875158B2 (en) | 1999-03-24 |
Family
ID=14682465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6116249A Expired - Lifetime JP2875158B2 (en) | 1994-05-30 | 1994-05-30 | Method for producing electrically insulating alumina sprayed coating |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2875158B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007217748A (en) * | 2006-02-16 | 2007-08-30 | Taiheiyo Cement Corp | Method for depositing spray deposit film on machinable ceramic substrate |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63125937A (en) * | 1986-11-15 | 1988-05-30 | Konica Corp | Silver halide color photographic sensitive material |
-
1994
- 1994-05-30 JP JP6116249A patent/JP2875158B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63125937A (en) * | 1986-11-15 | 1988-05-30 | Konica Corp | Silver halide color photographic sensitive material |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007217748A (en) * | 2006-02-16 | 2007-08-30 | Taiheiyo Cement Corp | Method for depositing spray deposit film on machinable ceramic substrate |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2875158B2 (en) | 1999-03-24 |
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