JP6416088B2 - 窒化珪素製耐摩耗性部材および窒化珪素焼結体の製造方法 - Google Patents
窒化珪素製耐摩耗性部材および窒化珪素焼結体の製造方法 Download PDFInfo
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Description
窒化珪素焼結体は、希土類−Hf−O系化合物結晶を有し、任意の断面において単位面積30μm×30μm当りの粒界相中の希土類−Hf−O系化合物結晶の面積比が5〜50%であり、重複しない5か所の単位面積間の希土類−Hf−O系化合物結晶の面積比のばらつきが10%以内であり、上記窒化珪素焼結体のXRD分析を実施したとき、希土類−Hf−O系化合物結晶に基づく30.0±0.5°のピーク強度I1、β−Si 3 N 4 結晶に基づく27.1±0.5°のピーク強度I2、33.7±0.5°のピーク強度I3が、I1/[(I2+I3)/2]=0.1〜0.2を満たすことを特徴とするものである。
得られた原料混合体粉末を成形して相対密度が50〜58%である成形体を得る工程と、得られた成形体を非酸化性雰囲気中にて温度1600〜1950℃で焼結する工程とを有することにより、
得られた窒化珪素焼結体は、希土類−Hf−O系化合物結晶を有し、任意の断面において単位面積30μm×30μmあたりの粒界相中の希土類−Hf−O系化合物結晶の面積比が5〜50%であり、上記重複しない5か所の単位面積間における希土類−Hf−O系化合物結晶の面積比のばらつきが10%以内であり、上記窒化珪素焼結体のXRD分析を実施したとき、希土類−Hf−O系化合物結晶に基づく30.0±0.5°のピーク強度I1、β−Si 3 N 4 結晶に基づく27.1±0.5°のピーク強度I2、33.7±0.5°のピーク強度I3が、I1/[(I2+I3)/2]=0.1〜0.2を満たすことを特徴とするものである。
2…Si3N4結晶粒子
3…希土類−Hf−O系化合物結晶
4…粒界ガラス相
Claims (11)
- β−Si3N4結晶粒子を主成分とし、希土類元素を酸化物に換算して2〜4質量%、Alを酸化物換算で2〜6質量%、Hfを酸化物換算で0.1〜5質量%含有する窒化珪素焼結体を具備する耐摩耗性部材において、
窒化珪素焼結体は、希土類−Hf−O系化合物結晶を有し、任意の断面において単位面積30μm×30μm当りの粒界相中の希土類−Hf−O系化合物結晶の面積比が5〜50%であり、重複しない5か所の単位面積間の希土類−Hf−O系化合物結晶の面積比のばらつきが10%以内であり、上記窒化珪素焼結体のXRD分析を実施したとき、希土類−Hf−O系化合物結晶に基づく30.0±0.5°のピーク強度I1、β−Si 3 N 4 結晶に基づく27.1±0.5°のピーク強度I2、33.7±0.5°のピーク強度I3が、I1/[(I2+I3)/2]=0.1〜0.2を満たすことを特徴とする窒化珪素製耐摩耗性部材。 - 希土類−Hf−O系化合物結晶の平均粒径が1μm以下であることを特徴とする請求項1に記載の窒化珪素製耐摩耗性部材。
- 窒化珪素焼結体は、4a族(Hfを除く)、5a族、6a族元素の中から選択される少なくとも1種を酸化物換算で0.1〜5質量%含有することを特徴とする請求項1ないし請求項2のいずれか1項に記載の窒化珪素製耐摩耗性部材。
- 窒化珪素焼結体は、SiCを2〜7質量%含有することを特徴とする請求項1ないし請求項3のいずれか1項に記載の窒化珪素製耐摩耗性部材。
- 耐摩耗性部材がベアリングボールであることを特徴とする請求項1ないし請求項4のいずれか1項に記載の窒化珪素製耐摩耗性部材。
- スラスト式転がり疲労試験機で面圧が5.1GPaの荷重を印加し、スピンドルを1200rpmで回転したときの寿命が600時間以上であることを特徴とする請求項1ないし請求項5のいずれか1項に記載の窒化珪素製耐磨耗性部材。
- 金属窒化法で合成され、酸素含有量が1.5質量%以下であり、α相型窒化珪素を80質量%以上含有し、平均粒径が1μm以下である窒化珪素粉末に、希土類元素を酸化物換算で2〜4質量%と、Alを酸化物換算で2〜6質量%と、Hfを酸化物換算で0.1〜5質量%とを添加した原料混合体粉末を調製する工程と、
得られた原料混合体粉末を成形して相対密度が50〜58%である成形体を得る工程と、得られた成形体を非酸化性雰囲気中にて温度1600〜1950℃で焼結する工程とを有することにより、
得られた窒化珪素焼結体は、希土類−Hf−O系化合物結晶を有し、任意の断面において単位面積30μm×30μmあたりの粒界相中の希土類−Hf−O系化合物結晶の面積比が5〜50%であり、上記重複しない5か所の単位面積間における希土類−Hf−O系化合物結晶の面積比のばらつきが10%以内であり、上記窒化珪素焼結体のXRD分析を実施したとき、希土類−Hf−O系化合物結晶に基づく30.0±0.5°のピーク強度I1、β−Si 3 N 4 結晶に基づく27.1±0.5°のピーク強度I2、33.7±0.5°のピーク強度I3が、I1/[(I2+I3)/2]=0.1〜0.2を満たすことを特徴とする窒化珪素焼結体の製造方法。 - 焼結する工程の前に、温度1500〜1600℃の間を2時間以上かけて昇温することを特徴とする請求項7記載の窒化珪素焼結体の製造方法。
- 得られた焼結体に、非酸化性雰囲気中で圧力30MPa以上であり、温度1600〜1950℃にて熱間静水圧プレス(HIP)処理することを特徴とする請求項7ないし請求項8のいずれか1項に記載の窒化珪素焼結体の製造方法。
- 原料混合体粉末を調製する工程は、4a族(Hfを除く)、5a族、6a族元素の中から選択される少なくとも1種を酸化物換算で0.1〜5質量%添加する工程を有することを特徴とする請求項7ないし請求項9のいずれか1項に記載の窒化珪素焼結体の製造方法。
- 原料混合体粉末を調製する工程は、SiCを2〜7質量%添加する工程を有することを特徴とする請求項7ないし請求項10のいずれか1項に記載の窒化珪素焼結体の製造方法。
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