JP6367426B2 - 溶射用スラリー及び溶射皮膜の形成方法 - Google Patents
溶射用スラリー及び溶射皮膜の形成方法 Download PDFInfo
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- JP6367426B2 JP6367426B2 JP2017100681A JP2017100681A JP6367426B2 JP 6367426 B2 JP6367426 B2 JP 6367426B2 JP 2017100681 A JP2017100681 A JP 2017100681A JP 2017100681 A JP2017100681 A JP 2017100681A JP 6367426 B2 JP6367426 B2 JP 6367426B2
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- Prior art keywords
- slurry
- thermal spraying
- thermal
- spraying
- oxide
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Description
この場合、溶射用スラリーは粘度調整剤をさらに含有してもよい。前記粘度調整剤は、ポリエーテルであってもよい。前記溶射用スラリーのpHは、6〜11であってもよい。
本発明のさらに別の態様では、分散媒として有機溶剤を含んだ上記態様に係る溶射用スラリーをプラズマ溶射して溶射皮膜を形成する溶射皮膜の形成方法が提供される。
溶射用スラリーは、溶射皮膜を形成する用途で例えば使用される。溶射用スラリーを基材に向けて溶射した場合には、基材上に溶射皮膜が形成される。基材の種類は、金属製やセラミックス製など特に問わない。
分散媒として使用することができる有機溶剤の例としては、メタノール、エタノール、n−プロピルアルコール、イソプロピルアルコールなどのアルコール類、トルエン、ヘキサン、灯油などが挙げられる。使用する分散媒の種類は、溶射用スラリーの溶射方法に応じて適宜に選択することが好ましい。すなわち、溶射用スラリーを高速フレーム溶射する場合には、水、有機溶剤、あるいは水と有機溶剤の混合物を分散媒として用いることが好ましい。溶射用スラリーをプラズマ溶射する場合には、有機溶剤を分散媒として用いることが好ましいが、水、あるいは水と有機溶剤の混合物を代わりに用いることも可能である。
溶射距離はまた、200mm以下であることが好ましい。この場合、溶射時にセラミック粒子が十分に加熱されることにより、緻密な溶射皮膜を得ることが容易となる。
第2実施形態の溶射用スラリーは、使用されるセラミック粒子の平均粒子径が200nm以上、好ましくは500nm以上であり、また、5μm以下、好ましくは4μm以下である点で、第1実施形態の溶射用スラリーと相違する。このようにセラミック粒子の粒子径が比較的大きいために、第2実施形態の溶射用スラリーの場合、セラミック粒子が溶射用スラリー中で重力により容易に沈降して沈殿を生じる。したがって、第2実施形態の溶射用スラリーは使用に際し、沈殿したセラミック粒子を再分散させるための撹拌などの操作が必要である。
(作用)
以上説明した第1及び第2実施形態の溶射用スラリーは、セラミック粒子の含有量が85質量%以下であって粘度が3000mPa・s以下であるために、溶射用スラリー中のセラミック粒子の含有量が比較的高い場合でも、溶射装置への良好な供給に適した所要の流動性を有しうる。すなわち、溶射皮膜の形成に十分な所要の流動性を有しうる。しかも、セラミック粒子の含有量が10質量%以上であることにより、溶射用スラリーは所要の溶射効率を確保することができる。
したがって、第1及び第2実施形態によれば、セラミック溶射皮膜を良好に形成することの可能な溶射用スラリーが提供される。
第1及び第2実施形態は次のように変更されてもよい。
・溶射用スラリー中のセラミック粒子は、セラミックス以外の成分を含むものであってもよい。
・第1実施形態の溶射用スラリーは、二種類以上の分散剤を含有するものであってもよい。
・溶射用スラリーは、二種類以上の消泡剤を含有するものであってもよい。
・溶射用スラリーは、二種類以上の防カビ剤を含有するものであってもよい。
・第1実施形態の溶射用スラリーは、凝集剤を含有してもよい。
・第2実施形態の溶射用スラリーは、分散剤、粘度調整剤、消泡剤、防腐剤又は防カビ剤を含有してもよい。
・溶射用スラリーは、分散剤、粘度調整剤、消泡剤、防腐剤、防カビ剤及び凝集剤以外の成分をさらに含有してもよい。
セラミック粒子を分散媒と混合し、必要に応じて分散剤、粘度調整剤又は凝集剤をさらに混合することにより、実施例5,10〜14,24,25,28〜32、参考例1〜4,6〜9,15〜23,26,27,33〜42及び比較例1〜3の溶射用スラリーを調製した。各溶射用スラリーの詳細を表1〜3に示す。
表1〜3中の“分散剤”欄には、各溶射用スラリーで使用した分散剤の種類を示す。同欄中のハイフン(−)は、分散剤を使用していないことを表す。分散剤を使用する場合には、溶射用スラリー中の分散剤の含有量が2質量%になる量で使用した。
表1〜3中の“沈降性”欄には、1Lの容積を有する高さ16.5cmの容器内に各溶射用スラリーを700mL入れて室温下で一週間静置したときに沈殿が生じたか否かを評価した結果を示す。同欄中の“沈降せず”は沈殿が生じなかったことを表し、“沈降”は沈殿が生じたことを表す。
Claims (12)
- スラリーを溶射して溶射皮膜を形成するための溶射用スラリーであり、
10質量%以上85質量%以下の量でセラミック粒子と、アニオン性高分子凝集剤及びカチオン性分散剤から選ばれる少なくとも一種を含有し、
前記セラミック粒子は、酸化イットリウム、酸化アルミニウム、酸化シリコン、酸化チタン、酸化ジルコニウム、イットリア安定化酸化ジルコニウム、酸化クロム、酸化亜鉛、ムライト、イットリウムアルミニウムガーネット、コージェライト、ジルコン、炭化ホウ素、スピネルセラミックス、希土類元素を含んだ酸化物セラミックス、及び、アルミニウム、シリコン、マンガン、亜鉛、カルシウム、ナトリウム、リン、フッ素、又はホウ素を含んだ複酸化物セラミックスから選ばれる少なくとも一種を含む粒子であり、前記セラミック粒子の比表面積から算出される平均粒子径が200nm以上5μm以下であり、
1mPa・s以上且つ3000mPa・s以下の粘度を有する溶射用スラリーであって、
1Lの容積を有する高さ16.5cmの容器内に前記溶射用スラリーを700mL入れて室温下で一週間静置したときに沈殿を生じることを特徴とする溶射用スラリー。 - 前記アニオン性高分子凝集剤は、イソブチレン−マレイン酸共重合体、及びカルボキシビニルポリマーから選ばれる少なくとも一種である請求項1に記載の溶射用スラリー。
- 前記カチオン性分散剤は、ポリアルキレンポリアミン系分散剤、及びイミダゾリン系分散剤から選ばれる少なくとも一種である請求項1又は2に記載の溶射用スラリー。
- 粘度調整剤をさらに含有する請求項1〜3のいずれか一項に記載の溶射用スラリー。
- 前記粘度調整剤は、ポリエーテルである請求項4に記載の溶射用スラリー。
- 前記溶射用スラリーのpHは、6〜11である請求項1〜5のいずれか一項に記載の溶射用スラリー。
- 分散媒として水を含んだ請求項1〜6のいずれか一項に記載の溶射用スラリーを高速フレーム溶射して溶射皮膜を形成する溶射皮膜の形成方法。
- 分散媒として有機溶剤を含んだ請求項1〜6のいずれか一項に記載の溶射用スラリーをプラズマ溶射して溶射皮膜を形成する溶射皮膜の形成方法。
- 前記溶射用スラリーをアクシャルフィード方式で溶射装置に供給することを含む請求項7又は8に記載の溶射皮膜の形成方法。
- 前記溶射用スラリーを、2つのフィーダーを用いて、両フィーダーからの溶射用スラリーの供給量の変動周期が互いに逆位相となるようにして溶射装置に供給することを含む請求項7又は8に記載の溶射皮膜の形成方法。
- 前記溶射用スラリーをフィーダーから送り出して溶射装置の直前でタンクにいったん貯留し、自然落下を利用してそのタンク内の溶射用スラリーを溶射装置に供給することを含む請求項7又は8に記載の溶射皮膜の形成方法。
- 導電性チューブを介して溶射装置へ溶射用スラリーを供給することを含む請求項7又は8に記載の溶射皮膜の形成方法。
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