Si_3N_4 Composite Toughened Synergistically by Forming in Situ Si_2N_2O and Adding β-Si_3N_4 Seed

The effect of different additives,seeds and introduction methods on in-situ growth Columnar Crystals of alumina was summarized.

Studies show that part of the mother liquor with crystal seeds can be reused in the preparation.

Effect of mineralizers on the effect of crystal seeds;

Study on iron red crystal seed formation from sulphate by wet process;

The effects of crystal seed on nature of α-Al_2O_3 powers by hydrothermal synthesis;

Effect of carbonization seeds on precipitation of sodium aluminate solution;

Study of effects of seeds on preparation of ZSM 5 membranes;

Effects of celsian seeds on crystallization and phase transformation in low-temperature processed BaO-Al_2O_3-SiO_2 glass-ceramics;

02,seed crystal consumption 1%,initial temperature for adding crystalseed:40～50℃,and stirring frequency for crystallization 10～15Hz.

H2TiO3 was obtained by hydrolyzing the solution of TiCl4 of fixed concentration with seed crystal introduced.

This paper is a study on the production of cement by mixing BaSO 4 and seed crystal and adopting the batch mixing method of low KH ,high SM ,and low IM .

Action of crystal seeds in the synthetic system of zeolite L;

,and addition of crystal seeds etc.

It considered that the new process had several advantages, such as sta-bility of brine quality, easy operation, saving energy, filtration capacity improvement by crystal seeds pro-tection.