SiC-coated carbon composite material
Provided is a SiC-coated carbon composite material including a graphite base material and a CVD-SiC coating covering the graphite base material. A porosity of a core part of the graphite base material is 12 to 20%, and a SiC-infiltrated layer extending from the CVD-SiC coating is included in a periphery of the core part of the graphite base material. The SiC-infiltrated layer is constituted of a plurality of regions arranged such that Si content becomes smaller stepwise in an order from a first surface on the CVD-SiC coating side toward a second surface on the graphite base material side.
1. A SiC-coated carbon composite material comprising:
a graphite base material; and
a CVD-SiC coating covering the graphite base material,
wherein a porosity of a core part of the graphite base material is 12 to 20%,
wherein a SiC-infiltrated layer extending from the CVD-SiC coating is included in a periphery of the core part,
wherein the SiC-infiltrated layer is constituted of a plurality of regions arranged such that Si content becomes smaller stepwise in an order from a first surface on the CVD-SiC coating side toward a second surface on the graphite base material side,
wherein all of the SiC included in the SiC-coated carbon composite material is formed by CVD method,
wherein the SiC-infiltrated layer includes SiC which is deposited inside pores of the graphite base material,
wherein the SiC-infiltrated layer has the thickness of 300 μm or more, and
wherein the porosity of the core part is 15 to 17%.
2. The SiC-coated carbon composite material according to claim 1 ,
wherein the SiC-infiltrated layer is constituted of a first region to an i-th region to an n-th region arranged in this order from the first surface toward the second surface, and Si content of the i-th region is larger than Si content of an (i+1)-th region.
3. The SiC-coated carbon composite material according to claim 1 ,
wherein a true density of the core part is 2.15 to 2.23 g/cm 3 .
4. A SiC-coated carbon composite material comprising:
a graphite base material in which a porosity of a core part thereof is 12 to 20%; and
a CVD-SiC coating covering the graphite base material,
wherein a SiC-infiltrated layer extending from the CVD-SiC coating is included in a periphery of the core part,
wherein the SiC-infiltrated layer is constituted of a first region arranged on the CVD-SiC coating side and a second region arranged on the graphite base material side and having a smaller Si content than that of the first region,
wherein all of the SiC included in the SiC-coated carbon composite material is formed by CVD method,
wherein the SiC-infiltrated layer includes SiC which is deposited inside pores of the graphite base material,
wherein the SiC-infiltrated layer has the thickness of 300 μm or more, and
wherein the porosity of the core part is 15 to 17%.
5. The SiC-coated carbon composite material according to claim 4 ,
wherein a true density of the core part is 2.15 to 2.23 g/cm 3 .