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Silicon nitride wear resistant member and method for producing silicon nitride sintered compact
The present invention provides a silicon nitride wear resistant member comprising a silicon nitride sintered compact containing β-Si3N4 crystal grains as a main component, 2 to 4% by mass of a rare earth element in terms of oxide, 2 to 6% by mass of Al in terms of oxide, and 0.1 to 5% by mass of Hf in terms of oxide, wherein the silicon nitride sintered compact has rare earth-Hf—O compound crystals; in an arbitrary section, an area ratio of the rare earth-Hf—O compound crystals in a grain boundary phase per unit area of 30 μm×30 μm is 5 to 50%; and variation of the area ratios of the rare earth-Hf—O compound crystals between the unit areas is 10% or less. Due to above structure, there can be provided a wear resistant member comprising the silicon nitride sintered compact having an excellent wear resistance and processability.
Silicon nitride wear resistant member and method for producing silicon nitride sintered compact
The present invention provides a silicon nitride wear resistant member comprising a silicon nitride sintered compact containing β-Si3N4 crystal grains as a main component, 2 to 4% by mass of a rare earth element in terms of oxide, 2 to 6% by mass of Al in terms of oxide, and 0.1 to 5% by mass of Hf in terms of oxide, wherein the silicon nitride sintered compact has rare earth-Hf—O compound crystals; in an arbitrary section, an area ratio of the rare earth-Hf—O compound crystals in a grain boundary phase per unit area of 30 μm×30 μm is 5 to 50%; and variation of the area ratios of the rare earth-Hf—O compound crystals between the unit areas is 10% or less. Due to above structure, there can be provided a wear resistant member comprising the silicon nitride sintered compact having an excellent wear resistance and processability.
Silicon nitride wear resistant member and method for producing silicon nitride sintered compact
YAMAGUTI HARUHIKO (author)
2017-05-30
Patent
Electronic Resource
English
SILICON NITRIDE WEAR RESISTANT MEMBER AND METHOD FOR PRODUCING SILICON NITRIDE SINTERED COMPACT
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