The Research on High Pressure Sintering of Mixed Powder γ-Si3N4 and α-Si3N4

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The high pressure and high temperature sintering of α-Si3N4 and γ-Si3N4 with Y2O3-Al2O3-La2O3 as additives were studied under pressures of 5.4 GPa and temperatures of 1420-1770 K. The effects of sintering temperatures and pressures on properties of sintered ceramic samples were investigated with X-ray diffraction and scanning electron microscopy. The results show that γ-Si3N4 and α-Si3N4 is transformed to β-Si3N4 completely. The highest relative densities and Vickers hardness (HV) of sintered samples are 98.71 and 21.76GPa, respectively. The sintered samples were composed of elongated β-Si3N4 rod crystals with disordered orientation and had intergranular interlocks and uniform and compact microstructure. Pulled out crystal grains on the fractured cross sections were obviously observed by SEM.

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Periodical:

Advanced Materials Research (Volumes 284-286)

Main Theme:

Edited by:

Xiaoming Sang, Pengcheng Wang, Liqun Ai, Yungang Li and Jinglong Bu

Pages:

1397-1400

DOI:

10.4028/www.scientific.net/AMR.284-286.1397

Citation:

H. Yao et al., "The Research on High Pressure Sintering of Mixed Powder γ-Si3N4 and α-Si3N4", Advanced Materials Research, Vols. 284-286, pp. 1397-1400, 2011

Online since:

July 2011

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$35.00

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