Dynamic compaction of composite materials containing diamond
AssigneeNew Mexico Tech Research Foundation
InventorsTamotsu Akashi, Akira Sawaoka
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Abstract
This invention relates to high-hardness, high-toughness, high-density composite materials containing diamond, and a process for making such materials comprising applying shock compression to the composite powders and inducing an exothermic chemical reaction. The process is useful in making metal, ceramic and cermet diamond composite materials.
Claims14
A process for forming compacts of powders of ceramics, metals and cermets containing diamond powder and exothermically reactive additive powders comprising:
- (a) mix high pressure phase diamond powder with non-stoichiometric exothermically reactive additive powders;
- (b) compress the resulting mixture of powders into a compact;
- and
- (c) apply a shock wave to said compact which is sufficient to compress the compact, to reduce at least a portion of the high pressure phase diamond powder into a low pressure phase at a residual temperature, and to cause exothermic sintering of the powders, interparticle bonding, and a chemical reaction between the particles.
An improved exothermically sintered and compressed compact of powders of ceramics, metals, and cermets comprising a mixture of high pressure phase diamond, high pressure phase diamond converted into a low pressure phase, and at least one non-stoichiometric exothermically reactive additive, and characterized by a high hardness, low cracking, and interparticle bonding, as a result of compressing the powders into the compact and applying a shock wave to the compact which is sufficient to cause exothermic sintering, interparticle bonding and a chemical reaction between particles of the powder, and to reduce a portion of the high pressure phase diamond powder into a low pressure phase at a residual temperature.
An improved exothermically sintered and compressed compact of powders of ceramics, metals, and cermets comprising a mixture of high pressure phase diamond converted into a low pressure phase, and at least one non-stoichiometric exothermically reactive additive and characterized by a high hardness, low cracking, and interparticle bonding, as a result of compressing the powders into the compact and applying a shock wave to the compact which is sufficient to cause exothermic sintering, interparticle bonding and a chemical reaction between particles of the powders, and to reduce all of the high pressure phase diamond powder into a low pressure phase at a residual temperature.
A process for forming a compact containing diamond powders comprising:
- (a) compress high pressure phase diamond powder into a compact;
- (b) apply a shock wave to said compact which is sufficient to compress the compact, to reduce at least a portion of the high pressure phase diamond powder into a low pressure phase at a residual temperature, and to cause exothermic sintering interparticle bonding and a chemical reaction between particles of the powders.
An improved exothermically sintered and compressed diamond compact comprising a mixture of high pressure phase diamond and high pressure phase diamond converted into a low pressure phase, and characterized by a high hardness, low cracking, and interparticle bonding, as a result of compressing the powders into a compact and applying a shock wave to the compact which is sufficient to cause exothermic sintering, interparticle bonding and a chemical reaction between particles of the powders, and to reduce at least a portion of the high pressure phase powder into a low pressure phase at a residual temperature.
Dependencies are inferred from the claim text.