Diamond polycrystalline body and method for manufacturing the same, and tool
AssigneeSumitomo Electric Industries, Ltd.
InventorsTakeshi SATO, Katsuko YAMAMOTO, Kazuhiro IKEDA, Hitoshi SUMIYA
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Abstract
Provided are a diamond polycrystalline body having a longer life than conventional diamond polycrystalline bodies when it is slid, a method for manufacturing the same, and a tool. In a diamond polycrystalline body, at least one element whose oxide has a melting point of less than or equal to 1000° C. is added thereto, and crystal grains have an average grain size of less than or equal to 500 nm. Thereby, wear of diamond can be suppressed, and the diamond polycrystalline body can have a longer life when it is slid.
Claims16
A diamond polycrystalline body to which at least one element whose oxide has a melting point of less than or equal to 1000° C. is added, and
- in which crystal grains have an average grain size of less than or equal to 500 nm.
A method for manufacturing a diamond polycrystalline body, comprising the steps of:
- fabricating a mixture by mixing a graphite source material and a mixing source material which contains an element whose oxide has a melting point of less than or equal to 1000° C.;
- fabricating a carbon material by crushing and mixing said mixture;
- and
- directly converting said carbon material into a diamond polycrystalline body under high temperature and high pressure conditions.
A method for manufacturing a diamond polycrystalline body, comprising the steps of:
- fabricating a coating layer-provided carbon material by coating a surface of powder of a graphite source material with a coating layer which contains an element whose oxide has a melting point of less than or equal to 1000° C.;
- and
- directly converting said coating layer-provided carbon material into a diamond polycrystalline body.
Dependencies are inferred from the claim text.