Fabrication and liquid-solid, two-phase erosion wear behaviour of 尾-Sialon ceramic from pyrophyllite by carbothermal reduction and nitridation

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• 作者：Gansheng Yang^a ; Li Yin^b ; Xian-ge Fang^b ; Minghao Fang^b ; ^{fmh@cugb.edu.cn" class="auth_mail} ; Yan-gai Liu^b ; Zhaohui Huang^b ; Baolin Liu^a ; ^{lbaolin@cugb.edu.cn" class="auth_mail}
• 关键词：尾-Sialon ceramic ; Pyrophyllite ; Erosion-wear testing ; Carbothermal reduction and nitridation ; Oil and gas drilling
• 刊名：Ceramics International
• 出版年：August 2014
• 年：2014
• 卷：40
• 期：7
• 页码：10737-10741
• 全文大小：943 K

文摘

In this paper, 尾-Sialon ceramic was formed with pyrophyllite as raw material and coke as reductant by carbothermal reduction and nitridation in flowing nitrogen atmosphere. Then, the erosion wear property of 尾-Sialon ceramic was measured. When the pre-synthesized temperature was 1400 °C, the effects of carbon additions (with theoretical carbon addition and carbon in excess of 10–50 wt.%) on the phase compositions of the products were studied by X-ray diffraction. 尾-Sialon ceramic was sintered at 1600 °C, and its erosion wear behavior was examined with the use of a self-designed, liquid–solid, two-phase flow erosion equipment. Results show that the optimum carbon addition to fabricate the 尾-Sialon ceramic powders was in excess of 10 wt% at 1400 °C. Under these conditions, the pre-synthesized powders were composed of 尾-Sialon as the main crystalline phase and 尾-SiC as the secondary phase. The relationship between volume erosion amount per area of the specimens and erosion time can be explained by two exponential equations—螖V=−5.2²t+10.4t$\mathrm{螖}V=-5.2t^2+10.4t$ and 螖V=−0.006²t+0.273t+4.884$\mathrm{螖}V=-0.006t^2+0.273t+4.884$ in two stages.