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US 12,630,476 B2Granted
Heat-resistant member
AssigneeKYOCERA Corporation
InventorsKentaro Kikuchi, Satoshi Toyoda, Takahiro Ueno, Hidehiro Takenoshita
Life of this patent
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Abstract
A heat-resistant member of the present disclosure is formed of an alumina-based ceramic containing alumina crystals and a glass formed of Si, Ca, Mg, and O, and an area ratio occupied by the glass in an inner portion is larger than an area ratio occupied by the glass in the surface portion.
Claims4
A ceramic member, wherein
- a surface portion comprises a region from a surface to a depth of 0.1 mm of the ceramic member, and an internal portion comprises a region having a depth of 0.5 mm or more from the surface of the ceramic member, the surface portion and the internal portion include an alumina-based ceramic including alumina crystals and a glass formed of Si, Ca, Mg, and O,
- an amount of the alumina crystals is 70 mass % or more and 89 mass % or less,
- an area ratio occupied by the glass in the internal portion is larger than an area ratio occupied by the glass in the surface portion, and
- a ratio of an internal portion area of glass to a surface portion area of glass is between 0.9 and 4.2.
1 more element
Dependencies are inferred from the claim text.