JP5732037B2 - 耐摩耗性部材およびその製造方法 - Google Patents
耐摩耗性部材およびその製造方法 Download PDFInfo
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- JP5732037B2 JP5732037B2 JP2012500576A JP2012500576A JP5732037B2 JP 5732037 B2 JP5732037 B2 JP 5732037B2 JP 2012500576 A JP2012500576 A JP 2012500576A JP 2012500576 A JP2012500576 A JP 2012500576A JP 5732037 B2 JP5732037 B2 JP 5732037B2
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Description
なお、硬度はJIS−R−1610に準じた方法により測定されるビッカース硬度であり、破壊靱性値はJIS−R−1607に記載されたIF法に準じて測定されるものである。
表1に示すように、窒化珪素原料粉末として、金属窒化法により製造された原料粉末であり、Fe成分(Fe換算10〜3500ppm)およびCa成分(Ca換算50〜2000ppm)、Mg成分(Mg換算10〜2000ppm)と含有量が異なる複数種類の原料粉末を用意した。
破壊靱性値の測定はJIS−R−1607に記載されたIF法に準じて行った。また、破壊靱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。
耐摩耗性部材の一種としての転動球(ベアリングボール)を製造する場合を評価する。
Claims (7)
- 窒化珪素を主成分とするセラミックス焼結体からなる耐摩耗性部材であって、
上記セラミックス焼結体が、希土類元素成分を希土類元素換算で1〜5質量%含有し、Al成分をAl元素換算で1〜5質量%含有し、
上記セラミックス焼結体のFe成分の含有量がFe換算で10ppm以上3500ppm以下であり、Ca成分の含有量がCa換算で1000ppmを超えて2000ppm以下であり、Mg成分の含有量がMg元素換算で1ppm以上2000ppm以下であると共に、窒化珪素結晶粒子のβ化率が95%以上であり、窒化珪素結晶粒子の最大長径が40μm以下であり、粒界相にあるCa化合物およびMg化合物がXRDにより検出されず、上記セラミックス焼結体のビッカース硬度が1400以上であり、破壊靱性が5.5MPa・m 1/2 以上であり、密度が3.18g/cm 3 以上であり、上記セラミックス焼結体が、表面粗さRa1μm以下の研磨面を具備し、セラミックス焼結体の硬度、破壊靱性値および密度のばらつきが±10%以内であることを特徴とする耐摩耗性部材。 - 前記セラミックス焼結体が、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種の元素を0.1〜5質量%含有することを特徴とする請求項1に記載の耐摩耗性部材。
- 前記耐摩耗性部材を構成する窒化珪素結晶粒子のアスペクト比の平均である平均アスペクト比が2以上であることを特徴とする請求項1乃至請求項2のいずれか1項に記載の耐摩耗性部材。
- 窒化珪素を主成分とするセラミックス焼結体から成る耐摩耗性部材の製造方法であって、
窒化珪素原料粉末および焼結助剤粉末を含有し、焼結助剤として希土類元素成分を希土類元素換算で1〜5質量%含有し、Al成分をAl元素換算で1〜5質量%含有し、Fe成分の含有量がFe換算で10ppm以上3500ppm以下であり、かつCa成分の含有量がCa換算で1000ppmを超えて2000ppm以下であり、Mg成分の含有量がMg換算で1ppm以上2000ppm以下である原料混合粉末を成形して成形体を得る工程と、この成形体を相対密度が85%以上97%以下となるように温度1600〜1950℃で1次焼結した後、焼結体の温度が1400℃に降下するまで100℃/h以上300℃/h以下の冷却速度で冷却する工程と、さらに相対密度が98%以上となるように焼結体を温度1600〜1900℃で2次焼結した後、焼結体の温度が1400℃に降下するまで100℃/h以上の冷却速度で冷却する工程と、得られたセラミックス焼結体の表面粗さをRa1μm以下にする研磨工程と、を具備することを特徴とする耐摩耗性部材の製造方法。 - 前記2次焼結は熱間静水圧プレス(HIP)法により実施することを特徴とする請求項4記載の耐摩耗性部材の製造方法。
- 前記耐摩耗性部材が板状部材であり、スラスト型転がり摩耗試験装置を使用して、板状部材上面にSUJ2製の転動球を配置し、この転動球に5.9GPaの最大接触応力が作用するように荷重を印加した状態で、回転数1200rpmで3×10 7 回だけ回転させた場合においても、耐摩耗性部材から成る板状部材の表面が剥離しないことを特徴とする請求項1記載の耐摩耗性部材。
- 前記耐摩耗性部材が転動球であり、スラスト型転がり摩耗試験装置を使用して、SUJ2製の板状部材上面に上記転動球を配置し、この転動球に5.9GPaの最大接触応力が作用するように荷重を印加した状態で、回転数1200rpmで400hだけ回転させた場合においても、耐摩耗性部材から成る転動球の表面が剥離しないことを特徴とする請求項1記載の耐摩耗性部材。
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