Patent ID: 11920222
Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 4:
5. The composite sintered material according to claim 1, wherein in a visual field having a longitudinal side of 18 μm and a lateral side of 23 μm within an arbitrarily specified cross section, twenty straight lines are drawn, comprising ten straight lines in a longitudinal direction and ten straight lines in a lateral direction in a form of a lattice to divide the visual field into eleven equal portions in the longitudinal direction and divide the visual field into eleven equal portions in the lateral direction,
wherein for each line segment in a number of line segments on the twenty straight lines, a distance between adjacent aluminum oxide grains with a grain size of more than or equal to 0.1 μm located on each line segment is more than or equal to 0.2 μm,
wherein each line segment in a total number of line segments on the twenty straight lines is connected between corresponding adjacent aluminum oxide grains, and
wherein a ratio of the number of line segments with respect to the total number of line segments is more than or equal to 90%.