JP2014139130A - 耐摩耗性部材およびそれを用いた耐摩耗性機器 - Google Patents
耐摩耗性部材およびそれを用いた耐摩耗性機器 Download PDFInfo
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Abstract
窒化けい素焼結体から成る耐摩耗性部材を提供する。
【解決手段】直径が20mm以上の球体であり、かつ体積が4000mm3以上である窒化けい素焼結体から成る耐摩耗性部材において、前記窒化けい素焼結体は、希土類元素成分を希土類元素換算で1〜5質量%、Al元素成分をAl元素換算で1〜6質量%、Fe元素成分をFe元素換算で10〜3500ppm、Ca元素成分をCa元素換算で10〜1000ppmを含有し、窒化けい素結晶粒子のβ化率が95%以上であり、窒化けい素結晶粒子の最大長径が40μm以下であると共に、窒化けい素焼結体の内部のビッカース硬度および破壊靭性値のばらつきが±10%以内であり、任意の断面を鏡面加工した単位面積100μm×100μmにおける窒化けい素結晶粒子の平均アスペクト比が2以上10以下であることを特徴とする耐摩耗性部材である。
【選択図】 図1
Description
上記したように、窒化けい素原料粉末を含む原料混合粉末からなる成形体に対して焼結を行うことにより相対密度が98%程度の焼結体を得た後、さらに10気圧以上の窒素ガス雰囲気中で相対密度が98%超、好ましくは99%以上となるように2次焼結を行うことで、強度に優れ、かつ、強度のばらつきも少ない窒化けい素焼結体を製造することができるようになっている。しかしながら、このように1次焼結で相対密度を98%程度とするためには製造工程を厳密に管理しなければならず、窒化けい素焼結体の製造コストが上昇するという問題がある。
長柱状粒の割合=(長手方向の径が3μm以上の窒化けい素結晶粒子の個数/窒化けい素結晶粒子の全個数)×100% ……(1)
さらに、上記耐摩耗性部材において、前記耐摩耗性部材は0.5μm以下の表面粗さ(Ra)を有することが好ましい。表面粗さが0.5μm以下であれば、破壊の起点となる欠陥部がほぼ解消されるので耐久性が良好な耐摩耗性部材が得られる。本発明の耐摩耗性部材は、表面粗さ(Ra)を0.5μm以下、さらには0.05μm以下となるように研磨加工を実施した場合においても、割れ、亀裂等の欠陥を発生することが少なく、製造加工する際の歩留りが極めて良好である。
なお、平均値を算出するための測定は、通常、原料組成、製造条件等を略同様として製造された複数の耐摩耗性部材の中から選択される任意の10個について行えばよい。
金属窒化法により製造され、表1に示すようにFe成分およびCa成分の含有量が異なる複数種類の窒化けい素原料粉末を用意した。これらの窒化けい素原料粉末に、焼結助剤粉末としてY2O3粉末、Al2O3粉末、AlN粉末およびTiO2粉末を配合して、表1に示すようなFe成分含有量およびCa成分含有量の原料混合粉末を用意した。
ばらつき[%]=((平均値−最遠値)/平均値)×100 ……(3)
破壊靭性値の測定はJIS−R−1607に記載されたIF法に準じて行う新原の式により求めた。また、破壊靭性値の平均値およびばらつきは上記ビッカース硬度の平均値およびばらつきと同様にして求めた。
研磨加工前の焼結体の体積が表5に示す値となるように原料混合粉末を秤量した点以外は、実施例2および比較例1、3の耐摩耗性部材と同様の組成および製造条件で処理して表5に示すような実施例13〜16および比較例5〜8に係る大直径の窒化けい素焼結体を作製した。得られた各窒化けい素焼結体から耐摩耗性部材の一種としての転動球(ベアリングボール)を製造した。得られた耐摩耗性部材としての転動球の製造歩留りを評価すると共に、各転動球の転がり寿命を測定した。
Claims (8)
- 直径が20mm以上の球体であり、かつ体積が4000mm3以上である窒化けい素焼結体から成る耐摩耗性部材において、前記窒化けい素焼結体は、希土類元素成分を希土類元素換算で1〜5質量%、Al元素成分をAl元素換算で1〜6質量%、Fe元素成分をFe元素換算で10〜3500ppm、Ca元素成分をCa元素換算で10〜1000ppmを含有し、窒化けい素結晶粒子のβ化率が95%以上であり、窒化けい素結晶粒子の最大長径が40μm以下であると共に、窒化けい素焼結体の内部のビッカース硬度および破壊靭性値のばらつきが±10%以内であり、
任意の断面を鏡面加工した単位面積100μm×100μmにおける窒化けい素結晶粒子の平均アスペクト比が2以上10以下であることを特徴とする耐摩耗性部材。 - 前記窒化けい素焼結体がTi,Zr,Hf,W,Mo,Ta,Nb及びCrから成る群より選択される少なくとも1種類の元素を0.1〜5重量%含有することを特徴とする請求項1記載の耐摩耗性部材。
- 前記耐摩耗性部材のボイドの最大径が3μm以下であることを特徴とする請求項1または2に記載の耐摩耗性部材。
- 転がり寿命が400時間以上であることを特徴とする請求項1ないし3のいずれか1項に記載の耐摩耗性部材。
- 前記粒界相成分の凝集径が20μm以下であることを特徴とする請求項1ないし4のいずれか1項に記載の耐摩耗性部材。
- 前記耐摩耗性部材は0.5μm以下の表面粗さ(Ra)を有することを特徴とする請求項1ないし5のいずれか1項に記載の耐摩耗性部材。
- 前記窒化けい素焼結体の2球圧砕強度が100N/mm2以上であることを特徴とする請求項1ないし6のいずれか1項に記載の耐摩耗性部材。
- 請求項1ないし7のいずれか1項に記載の耐摩耗性部材を複数個具備することを特徴とする耐摩耗性機器。
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