Composite stratified-hardened containers for synthesis of diamond polycrystals of a type carbonado

Abstract

The article systematizes the basic requirements for materials of containers of solid-phase apparatus of high pressure (AHP) and the criteria of the effective work of AHP containers of a type of anvil with a hole and toroid (AHT). In order to eliminate and minimize shortcomings of AHP container sat generation of a high pressure detected at investigation of containers reliability, we proposed composite stratified-hardened containers. The results of two developed AHP containers of a type AHT for synthesis of super-hard materials, namely, diamond polycristals carbonado, are given in this work. The main material for manufacturing the containers
was a compound of limestone (lithographic stone), dolomite, iron oxide (Fe2O3), magnesium (MgO) and high-aluminous Portland cement in a ratio of 10:4:1:2:3, respectively. Water solution of polyvinyl spirit served as an adhesive. The reinforced layers were in near-surface layers and concentrically-middle part of the container. To reinforce the pointed layers of the container Fe2O3, MgO and high-aluminum Portland cement were additionally introduced. It was found that the most outcome increase of the product of the synthesis for near-surface layers of the reinforced container is observed when the content of Fe2O3, MgO, high-alumina
Portland cement is 5, 4, 6in masse % and makes 23.8 %. And for the concentrically-middle part of the reinforced container — 4, 3, 3, respectively, and diamonds outcome increase makes28.5 % compared to diamond synthesis in containers without reinforced layers.