JP6590686B2 - 絶縁軸受、並びに軸受のコーティング方法 - Google Patents
絶縁軸受、並びに軸受のコーティング方法 Download PDFInfo
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- 238000000576 coating method Methods 0.000 title claims description 21
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- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 57
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 53
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- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
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- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
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- F16C11/0638—Construction or details of the socket member with linings the linings being made of plastics characterised by geometrical details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F16C11/0619—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints the female part comprising a blind socket receiving the male part
- F16C11/0623—Construction or details of the socket member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F16C11/00—Pivots; Pivotal connections
- F16C11/04—Pivotal connections
- F16C11/06—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints
- F16C11/0685—Manufacture of ball-joints and parts thereof, e.g. assembly of ball-joints
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
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- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
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- F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2206/00—Materials with ceramics, cermets, hard carbon or similar non-metallic hard materials as main constituents
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- F16C2206/44—Ceramics, e.g. carbides, nitrides, oxides, borides of a metal based on ceramic oxides based on aluminium oxide (Al2O3)
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Description
(1)少なくとも一方が金属製である外輪及び内輪、前記外輪と前記内輪との間に転動自在となる複数の転動体を備え、かつ、前記外輪及び内輪の少なくとも片方を絶縁膜で被覆した絶縁軸受において、
前記絶縁膜が、添加物としての炭化ケイ素および/または窒化アルミニウムが酸化アルミニウムからなる母材中に分散した混合物であり、かつ、前記添加物の含有量が混合物全量の1〜40質量%であることを特徴とする絶縁軸受。
(2)前記絶縁膜が、炭化ケイ素粉末および/または窒化アルミニウム粉末を合計2〜40質量%含み、残部が酸化アルミニウム粉末である混合溶射材を溶射してなる溶射膜であることを特徴とする上記(1)記載の絶縁軸受。
(3)前記混合溶射材が、平均粒径15μm以上25μm未満の酸化アルミニウム粉末に、平均粒径2μm以上5μm未満の炭化ケイ素粉末および/または平均粒径2μm以上5μm未満の窒化アルミニウム粉末を合計2〜20質量%となるように添加したものであることを特徴とする上記(2)に記載の絶縁軸受。
(4)前記混合溶射材が、平均粒径1μm以上5μm未満の酸化アルミニウム粉末に、平均粒径2μm以上5μm未満の炭化ケイ素粉末および/または平均粒径2μm以上5μm未満の窒化アルミニウム粉末を合計2〜20質量%となるように添加し、スプレイドライヤーで造粒したものであることを特徴とする上記(2)に記載の絶縁軸受。
(5)前記絶縁膜の膜厚が50μm以上250μm以下であることを特徴とする上記(1)〜(4)のいずれか一項に記載の絶縁軸受。
(6)軸受の互いに同心に配置された外輪と内輪の少なくとも片方が金属製であり、かつ、絶縁膜で被覆されるコーティング方法において、
平均粒径が1μm以上30μm未満の酸化アルミニウム粉末に、平均粒径が2μm以上10μm未満の炭化ケイ素粉末および/または平均粒径が2μm以上10μm未満の窒化アルミニウム粉末を合計2〜40質量%となるように添加した混合溶射材を用いて溶射を行ない、前記外輪および/または前記内輪に前記絶縁膜を形成することを特徴とする軸受のコーティング方法。
(7)前記溶射を、プラズマ溶射で行なうことを特徴とする上記(6)に記載の軸受のコーティング方法。
(8)前記混合溶射材が、平均粒径15μm以上25μm未満の酸化アルミニウム粉末に、平均粒径2μm以上5μm未満の炭化ケイ素粉末および/または平均粒径2μm以上5μm未満の窒化アルミニウム粉末を合計2〜20質量%となるように添加したものであることを特徴とする上記(6)または(7)記載の軸受のコーティング方法。
(9)前記混合溶射材が、平均粒径1μm以上5μm未満の酸化アルミニウム粉末に、平均粒径2μm以上5μm未満の炭化ケイ素粉末および/または平均粒径2μm以上5μm未満の窒化アルミニウム粉末を合計2〜20質量%となるように添加し、スプレイドライヤーで造粒したものであることを特徴とする上記(6)又は(7)記載の軸受のコーティング方法。
(10)前記絶縁膜の膜厚を50μm以上250μm以下とすることを特徴とする上記(6)〜(9)のいずれか一項に記載の軸受のコーティング方法。
本発明の各溶射材原料粉末の「平均粒径」は、レーザ回折・散乱法にて測定したD50の値を意味している。
プラズマ溶射によって絶縁膜を形成する前に、軸受素材を有機溶剤で洗浄脱脂後、非溶射部を治具で保護しブラスト処理で粗面化する。
酸化アルミニウムに配合する炭化ケイ素および/または窒化アルミニウムの比率を変え、絶縁破壊電圧と熱伝導率およびコストの比較を実施した。プラズマ溶射によって絶縁膜を形成する前に、供試片素材を有機溶剤で洗浄脱脂後、ブラスト処理で粗面化する。
絶縁膜の膜厚を変え、絶縁性能、皮膜強度およびコストの比較を実施した。プラズマ溶射によって絶縁膜を形成する前に、供試片素材を有機溶剤で洗浄脱脂後、ブラスト処理で粗面化する。
2 内輪
3 転動体
4 保持器
5 絶縁膜
Claims (10)
- 少なくとも一方が金属製である外輪及び内輪、前記外輪と前記内輪との間に転動自在となる複数の転動体を備え、かつ、前記外輪及び内輪の少なくとも片方を絶縁膜で被覆した絶縁軸受において、
前記絶縁膜が、添加物としての炭化ケイ素および/または窒化アルミニウムが酸化アルミニウムからなる母材中に分散した混合物であり、かつ、前記添加物の含有量が混合物全量の1〜40質量%であることを特徴とする絶縁軸受。 - 前記絶縁膜が、炭化ケイ素粉末および/または窒化アルミニウム粉末を合計2〜40質量%含み、残部が酸化アルミニウム粉末である混合溶射材を溶射してなる溶射膜であることを特徴とする請求項1記載の絶縁軸受。
- 前記混合溶射材が、平均粒径15μm以上25μm未満の酸化アルミニウム粉末に、平均粒径2μm以上5μm未満の炭化ケイ素粉末および/または平均粒径2μm以上5μm未満の窒化アルミニウム粉末を合計2〜20質量%となるように添加したものであることを特徴とする請求項2に記載の絶縁軸受。
- 前記混合溶射材が、平均粒径1μm以上5μm未満の酸化アルミニウム粉末に、平均粒径2μm以上5μm未満の炭化ケイ素粉末および/または平均粒径2μm以上5μm未満の窒化アルミニウム粉末を合計2〜20質量%となるように添加し、スプレイドライヤーで造粒したものであることを特徴とする請求項2に記載の絶縁軸受。
- 前記絶縁膜の膜厚が50μm以上250μm以下であることを特徴とする請求項1〜4のいずれか一項に記載の絶縁軸受。
- 軸受の互いに同心に配置された外輪と内輪の少なくとも片方が金属製であり、かつ、絶縁膜で被覆されるコーティング方法において、
平均粒径が1μm以上30μm未満の酸化アルミニウム粉末に、平均粒径が2μm以上10μm未満の炭化ケイ素粉末および/または平均粒径が2μm以上10μm未満の窒化アルミニウム粉末を合計2〜40質量%となるように添加した混合溶射材を用いて溶射を行ない、前記外輪および/または前記内輪に前記絶縁膜を形成することを特徴とする軸受のコーティング方法。 - 前記溶射を、プラズマ溶射で行なうことを特徴とする請求項6に記載の軸受のコーティング方法。
- 前記混合溶射材が、平均粒径15μm以上25μm未満の酸化アルミニウム粉末に、平均粒径2μm以上5μm未満の炭化ケイ素粉末および/または平均粒径2μm以上5μm未満の窒化アルミニウム粉末を合計2〜20質量%となるように添加したものであることを特徴とする請求項6または7に記載の軸受のコーティング方法。
- 前記混合溶射材が、平均粒径1μm以上5μm未満の酸化アルミニウム粉末に、平均粒径2μm以上5μm未満の炭化ケイ素粉末および/または平均粒径2μm以上5μm未満の窒化アルミニウム粉末を合計2〜20質量%となるように添加し、スプレイドライヤーで造粒したものであることを特徴とする請求項6または7に記載の軸受のコーティング方法。
- 前記絶縁膜の膜厚を50μm以上250μm以下とすることを特徴とする請求項6〜9のいずれか一項に記載の軸受のコーティング方法。
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