【摘 要】
：
Phase pure ZrB2-SiC composite powders were prepared after 1 450 ℃/3 h via carbothermal reduction route,by using ZrSiO4,B2O3 and carbon as the raw materials.The influences of firing temperature as well as the type and amount of additive on the phase compos
【机 构】
：
The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,W
【出 处】
：
武汉理工大学学报（材料科学版）（英文版）
论文部分内容阅读
Phase pure ZrB2-SiC composite powders were prepared after 1 450 ℃/3 h via carbothermal reduction route,by using ZrSiO4,B2O3 and carbon as the raw materials.The influences of firing temperature as well as the type and amount of additive on the phase composition of final products were detailedly investigated.The results indicated that the onset formation temperature of ZrB2-SiC was reduced to 1 400 ℃ by the present conditions,and oxide additive(including CoSO4·7H2O,Y2O3 and TiO2) was effective in enhancing the decomposition of raw ZrSiO4,therefore accelerating the synthesis of ZrB2-SiC.Moreover,microstructural observation showed that the as-prepared ZrB2 and SiC respectively had well-defined hexagonal columnar and fibrous morphology.Furthermore,the methodology of back-propagation artificial neural networks(BP-ANNs)was adopted to establish a model for predicting the reaction extent(e g,the content of ZrB2-SiC in final product)in terms of various processing conditions.The results predicted by the as-established BP-ANNs model matched well with that of testing experiment(with a mean square error in 10-3 degree),verifying good effectiveness of the proposed strategy.
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