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Information × Registration Number 0204U003740, 0103U006245 , R & D reports Title Sintering of nanocrystalline materials based on diamond powders under high pressure:processes and mechanisms of structure formation popup.stage_title Head Oleinik G.S., Registration Date 20-04-2004 Organization Frantzevich Insitute for Materials Science Problems of the Ukranian National Academy of Sciences popup.description2 It is shown that preliminary hydrogen treatment of diamond powder produced by shock-wave pressing of graphite favors its compressibility under high pressure (7.7 Gpa) and at high temperatures 1500-1900 C. Specimens with a density of 3.3 g/cm3 were prepared. The grain size of the specimens was 70 nm. Structural examinations indicated that the hydrogen treatment provided the cleaning of initial particles from adsorbed particles. The formation of the granular structure in the specimens at 1900-2100 C is determined by the development of collective crystallization. Product Description popup.authors popup.nrat_date 2020-04-02 Close