Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
SILICON NITRIDE SINTERED COMPACT, BEARING BALL AND BEARING
To inhibit the breakoff of Fe-containing particles by securing those particles of a silicon nitride sintered compact to restrain deterioration in the high-temperature strength of the sintered compact.SOLUTION: A silicon nitride sintered compact including silicon nitride as a main component includes: the β phase type silicon nitride particles; Fe-containing particles containing Fe and at least one specified element selected from the specified element group consisting of Ti, Zr, W, Mo, Ta, Nb, V and Cr; and a grain boundary phase including at least one rare-earth element, Al, Si and O. When observing a cross section of the silicon nitride sintered compact, the area occupied by the Fe-containing particle is 5% or less of total area, and the maximum particle size of the above particle is 5 μm or less. The sintered compact includes Fe of 2,000 ppm or more but 7,000 ppm or less and satisfies the expression of 0
【課題】窒化珪素質焼結体のＦｅ含有粒子を確保した上でＦｅ含有粒子の脱粒を抑制し、窒化珪素質焼結体の高温強度の低下を抑制する。【解決手段】主成分として窒化珪素を含有する窒化珪素質焼結体は、β相型の窒化珪素粒子と、Ｔｉ、Ｚｒ、Ｗ、Ｍｏ、Ｔａ、Ｎｂ、Ｖ、およびＣｒからなる特定元素群より選択される１種類以上の特定元素と、Ｆｅと、を含むＦｅ含有粒子と、少なくとも１種類の希土類元素、Ａｌ、Ｓｉ、およびＯを含む粒界相と、を有し、窒化珪素質焼結体の断面を観察したときに、Ｆｅ含有粒子が占める面積は全体の５％以下であり、かつ、Ｆｅ含有粒子の最大粒径は５μｍ以下であり、Ｆｅを２０００ｐｐｍ以上７０００ｐｐｍ以下含有し、Ｆｅ含有粒子の粒径をＲとし、Ｆｅ含有粒子中におけるＦｅと特定元素との含有率の合計に対するＦｅの含有率の割合をＸとしたときに、０＜Ｒ×Ｘ≦１．０×１０-7（ｍ）を満たす。【選択図】図４
SILICON NITRIDE SINTERED COMPACT, BEARING BALL AND BEARING
To inhibit the breakoff of Fe-containing particles by securing those particles of a silicon nitride sintered compact to restrain deterioration in the high-temperature strength of the sintered compact.SOLUTION: A silicon nitride sintered compact including silicon nitride as a main component includes: the β phase type silicon nitride particles; Fe-containing particles containing Fe and at least one specified element selected from the specified element group consisting of Ti, Zr, W, Mo, Ta, Nb, V and Cr; and a grain boundary phase including at least one rare-earth element, Al, Si and O. When observing a cross section of the silicon nitride sintered compact, the area occupied by the Fe-containing particle is 5% or less of total area, and the maximum particle size of the above particle is 5 μm or less. The sintered compact includes Fe of 2,000 ppm or more but 7,000 ppm or less and satisfies the expression of 0
【課題】窒化珪素質焼結体のＦｅ含有粒子を確保した上でＦｅ含有粒子の脱粒を抑制し、窒化珪素質焼結体の高温強度の低下を抑制する。【解決手段】主成分として窒化珪素を含有する窒化珪素質焼結体は、β相型の窒化珪素粒子と、Ｔｉ、Ｚｒ、Ｗ、Ｍｏ、Ｔａ、Ｎｂ、Ｖ、およびＣｒからなる特定元素群より選択される１種類以上の特定元素と、Ｆｅと、を含むＦｅ含有粒子と、少なくとも１種類の希土類元素、Ａｌ、Ｓｉ、およびＯを含む粒界相と、を有し、窒化珪素質焼結体の断面を観察したときに、Ｆｅ含有粒子が占める面積は全体の５％以下であり、かつ、Ｆｅ含有粒子の最大粒径は５μｍ以下であり、Ｆｅを２０００ｐｐｍ以上７０００ｐｐｍ以下含有し、Ｆｅ含有粒子の粒径をＲとし、Ｆｅ含有粒子中におけるＦｅと特定元素との含有率の合計に対するＦｅの含有率の割合をＸとしたときに、０＜Ｒ×Ｘ≦１．０×１０-7（ｍ）を満たす。【選択図】図４
SILICON NITRIDE SINTERED COMPACT, BEARING BALL AND BEARING
窒化珪素質焼結体、ベアリングボール、およびベアリング
ITO TSUNEYUKI (Autor:in) / FUNAKI KOJI (Autor:in)
01.03.2021
Patent
Elektronische Ressource
Japanisch
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