添加铈的氮化硅热压

Ceramurgia International Pub Date : 1980-07-01 DOI:10.1016/0390-5519(80)90019-8

G.N Babini, A Bellosi, P Vincenzini

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引用次数: 18

摘要

研究了(1 ~ 20)wt% CeO2Si3N4在T = 1823 ÷ 1973 K和Pa = 14.7 ÷ 39.2 MNm−1条件下的热压动力学、αβ转化反应和β相织体。晶间正硅酸铈Ce4.67(SiO4) 30o液相存在时，烧结可能通过流变重排、固溶/再沉淀和晶界滑动等多组分机制发生。同样的溶解/扩散/再沉淀机制似乎适用于致密化和热压初期的αβ转化反应。β相织构对热压参数和液相量也有明显的依赖性。

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Hot pressing of silicon nitride with ceria additions

Hot pressing kinetics, $α β$ conversion reaction and β-phase texture were studied for (1 – 20) wt% CeO₂Si₃N₄ compositions hot pressed at T = 1823 ÷ 1973 K and P_a = 14.7 ÷ 39.2 MNm⁻¹ in a nitrogen atmosphere. Sintering is likely to occur in the presence of an intergranular cerium orthosilicate Ce_4.67(SiO₄)₃O liquid phase by a multicomponent mechanism including rheologic rearrangement, solution/reprecipitation and grain boundary sliding. The same solution/diffusion/reprecipitation mechanism seems to apply for densification and for the $α β$ conversion reaction in the early stages of hot pressing. An appreciable dependence of the β - phase texture on hot pressing parameters and amount of liquid phase is also featured.

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Ceramurgia International

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