METHODS OF FORMING A SUPERHARD STRUCTURE OR BODY COMPRISING A BODY OF POLYCHRYSTALLINE DIAMOND CONTAINING MATERIAL
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United States of America Patent
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Issued Date -
May 18, 2023
app pub date -
Dec 20, 2022
filing date -
Dec 20, 2022
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Abstract
A method of producing a free standing PCD comprises forming a mass of combined diamond particles and precursor compound(s) for the metals of the metallic network by suspending the diamond particles in a liquid, and crystallising and /or precip -itating the precursor compounds in the liquid. The mass is then removed from suspension by sedimentation and/or evaporation to form a dry powder of combined diamond particles and precursor compound(s). The powder is subjected to a heat treatment to disso -ciate and reduce the precursor compound(s) to form metal particles smaller in size than the diamond particles to provide a homogen -eous mass. This is then consolidated using isostatic compaction to form a homogeneous cohesive green body of a pre-selected size and 3-dimensional shape. The green body is subjected to high pressure and high temperature conditions such that the metallic mater -ial wholly or in part becomes molten and facilitates diamond particle to particle bonding via partial diamond re-crystallisation to form a free standing PCD body.
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