The analysis of the motive forces of sintering micro- and nanosized diamond powders at high pressure

It has been shown that in sintering diamond powders the summation of the Laplace pressure and external pressure acting on the system is not observed. The modeling of the shape of pores has shown that the cases are possible when capillary forces are directed in opposition to external forces. An expression is proposed that describes the limiting compaction of a system of diamond particles in this case. Experimental values of the density of diamond polycrystals sintered from diamond powders of various dispersions are well described by this equation within measuring error. To improve the sintering, additives that form chemical compounds with carbon and compound diamond particles in sintering should be used.