Abstract

A mechanism for the consolidation (performed experimentally earlier) of brittle quartz powder particles under a strong external action (high-pressure torsion) is proposed. This mechanism is based on possible destruction of silicon–oxygen tetrahedra via breakage of the Si–O interatomic bonds. The surface layer of the ceramic powder particles is shown to contain initial tetrahedra and their “fragments,” i.e., defects of the tetrahedra (proposed for the first time by the authors together with the name). The emergence of the tetrahedra and their fragments to the surface by the faces, edges, and vertices predetermines the surface shape and, eventually, surface adhesion. The enhancement of an external action results in healing broken Si–O bonds, which predetermines the possibility of partial or complete consolidation.

中文翻译：

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高压扭转过程中的硅氧石英四面体和固结过程

摘要

提出了一种在强外部作用（高压扭力）下使脆性石英粉颗粒固结（较早进行实验）的机理。该机制是基于Si-O原子间键的断裂可能破坏硅-氧四面体的。陶瓷粉末颗粒的表面层显示出含有初始的四面体及其“碎片”，即四面体的缺陷（作者首次提出并提出了名称）。四面体及其碎片通过面，边和顶点出现在表面上，这预先确定了表面形状，并最终确定了表面附着力。外部作用的增强导致愈合的Si-O键断裂，从而预先确定了部分或完全固结的可能性。