JP2012096970A - 高剛性セラミックス材料およびその製造方法 - Google Patents
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Abstract
【解決手段】炭化ホウ素粉末と、焼結助剤としてケイ素の酸化物、窒化物、酸窒化物、アルミニウムの酸化物、窒化物、酸窒化物、アルミニウムとケイ素の複合酸化物、複合窒化物、複合酸窒化物の中からSi、Al、O、Nを全て含むように選択した1種または複数種とを準備し、これらの原料を混合、成形後、焼成することで、炭化ホウ素を90〜99.5質量%含有し、結晶粒界に少なくともケイ素、アルミニウム、酸素、窒素が共存している高剛性セラミックス材料を得る。
【選択図】なし
Description
(1)炭化ホウ素を90〜99.5質量%含有し、結晶粒界に少なくともケイ素、アルミニウム、酸素、窒素が共存している高剛性セラミックス材料。
(2)結晶粒界が不可避的不純物を除いて、Si=0.04〜1.0質量%、Al=0.25〜5.5質量%、O=0.05〜1.1質量%、N=0.13〜3.0質量%からなる(1)に記載の高剛性セラミックス材料。
(3)炭化ケイ素を5質量%以下含有する(1)または(2)に記載の高剛性セラミックス材料。
(4)遊離炭素を5質量%以下含有する(1)〜(3)のいずれか1項に記載の高剛性セラミックス材料。
(5)ヤング率が370GPa以上である請求項(1)〜(4)のいずれか1項に記載の高剛性セラミックス材料。
(6)(1)〜(5)のいずれか1項に記載の高剛性セラミックス材料の製造方法であって、
炭化ホウ素粉末と、焼結助剤としてケイ素の酸化物、窒化物、酸窒化物、アルミニウムの酸化物、窒化物、酸窒化物、アルミニウムとケイ素の複合酸化物、複合窒化物、複合酸窒化物の中からSi、Al、O、Nを全て含むように選択した1種類または複数種とを準備し、これらの原料を混合、成形後、焼成する高剛性セラミックス材料の製造方法。
(7)焼結助剤として少なくともアルミニウムとケイ素の複合酸窒化物の粉末を使用する(6)に記載の高剛性セラミックス材料の製造方法。
(8)アルミニウムとケイ素の複合酸窒化物としてSiO2とAlNのモル比が1:6の割合の化合物を使用する(7)に記載の高剛性セラミックス材料の製造方法。
炭化ホウ素粉末(平均粒径2μm)と酸窒化アルミニウムケイ素化合物粉末(サイアロン21R:SiAl6O2N6、平均粒径1μm)を表1に示す配合割合で原料粉末とし、これに適量の蒸留水、分散剤、バインダーを添加してボールミルにより均一に混合し、スプレードライにより乾燥させた坏土を一軸加圧成形した後、CIP成形して60×90×20mmの成形体を得た。この成形体をアルゴン中2200℃で4時間常圧焼成し焼結体を得た。
(実施例1)において使用した炭化ホウ素粉末とサイアロン21R粉末の他に、焼結助剤としてアルミナ粉末(Al2O3、平均粒径0.5μm)、窒化アルミ粉末(AlN、平均粒径1μm)、窒化ケイ素粉末(Si3N4、平均粒径0.8μm)、酸窒化ケイ素粉末(SiON2、平均粒径1.7μm)を使用し、表2に示す配合割合に従って焼結体を作製した。作製方法は(実施例1)と同様であり、焼結体の特性も同様に評価した。化学成分についても前述したように焼結助剤が焼成中に揮発することを考慮して焼成前後の重量減少率と焼結体の結晶粒界をEPMAで分析することで算出した。
(実施例1)において使用した炭化ホウ素粉末とサイアロン21R粉末の他に、炭化ケイ素粉末(SiC、平均粒径0.6μm)、遊離炭素としてカーボンブラック粉末(C、平均粒径1μm)を使用し、表3に示す配合割合に従って焼結体を作製した。作製方法は(実施例1)と同様であり、焼結体の特性も同様に評価した。なお、化学成分の算出においては、炭化ケイ素(SiC)と遊離炭素はアルゴン雰囲気中では高温でも安定なため炭化ホウ素と同様の取り扱いとした。なお、表中に記載の焼結体の化学成分の欄において、SiCは炭化ケイ素粉末からもたらされた成分で、Siは結晶粒界に存在する成分で炭化ケイ素粉末からもたらされるSi成分を含まない。またFCは遊離炭素を意味し、炭化ホウ素(B4C)や炭化ケイ素(SiC)中に含まれるC成分を含まない。
Claims (8)
- 炭化ホウ素を90〜99.5質量%含有し、結晶粒界に少なくともケイ素、アルミニウム、酸素、窒素が共存している高剛性セラミックス材料。
- 結晶粒界が不可避的不純物を除いて、Si=0.04〜1.0質量%、Al=0.25〜5.5質量%、O=0.05〜1.1質量%、N=0.13〜3.0質量%からなる請求項1に記載の高剛性セラミックス材料。
- 炭化ケイ素を5質量%以下含有する請求項1または2に記載の高剛性セラミックス材料。
- 遊離炭素を5質量%以下含有する請求項1〜3のいずれか1項に記載の高剛性セラミックス材料。
- ヤング率が370GPa以上である請求項1〜4のいずれか1項に記載の高剛性セラミックス材料。
- 請求項1〜5のいずれか1項に記載の高剛性セラミックス材料の製造方法であって、
炭化ホウ素粉末と、焼結助剤としてケイ素の酸化物、窒化物、酸窒化物、アルミニウムの酸化物、窒化物、酸窒化物、アルミニウムとケイ素の複合酸化物、複合窒化物、複合酸窒化物の中からSi、Al、O、Nを全て含むように選択した1種類または複数種とを準備し、これらの原料を混合、成形後、焼成する高剛性セラミックス材料の製造方法。 - 焼結助剤として少なくともアルミニウムとケイ素の複合酸窒化物の粉末を使用する請求項6に記載の高剛性セラミックス材料の製造方法。
- アルミニウムとケイ素の複合酸窒化物としてSiO2とAlNのモル比が1:6の割合の化合物を使用する請求項7に記載の高剛性セラミックス材料の製造方法。
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JP2010247520A JP5692845B2 (ja) | 2010-11-04 | 2010-11-04 | 高剛性セラミックス材料およびその製造方法 |
EP11838092.2A EP2636659B1 (en) | 2010-11-04 | 2011-11-04 | High rigidity ceramic material and method for producing same |
PCT/JP2011/075436 WO2012060442A1 (ja) | 2010-11-04 | 2011-11-04 | 高剛性セラミックス材料およびその製造方法 |
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CN105130438B (zh) * | 2015-08-21 | 2017-09-05 | 上海工程技术大学 | 一种基于反应烧结制备碳化硼陶瓷复合材料的方法 |
KR102020059B1 (ko) * | 2017-11-07 | 2019-11-04 | 문대용 | 타이어용 스터드 및 그 제조방법 |
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