采用凝胶注模成型工艺制备了石墨浆料,研究了石墨粉体类型、pH值、分散剂加入量和固相含量对浆料粘度的影响,浆料温度对凝胶固化时间的影响,以及乙酰丙酮对素坯强度的影响.实验结果表明:当采用等静压石墨粉,pH值为7,分散剂加入量为4wt%,固相含量为50vol%时,可制备流动性良好的石墨浆料;浆料温度为3 ℃时,凝胶固化时间为5.6 min;当乙酰丙酮加入量为0.6wt%时,素坯强度达到15.8 MPa.
Graphite slurry was prepared by gelcasting process.The influences of types of graphite powders, pH value, dispersant and solid loading on the viscosity of slurry were investigated.The effects of slurry temperature on gel time and acetylacetone on the flexural strength of graphite green body were studied.The results show that the fluidity properties of graphite has the best when type of graphite is isostatic pressing graphite powder, pH value is 7, content of dispersant solution(respect to graphite weight) is 4wt%, and solid loading is 50vol%.When the slurry temperature is 3 ℃,the gel time is 5.6 min.Flexural strength of green body is 15.8 MPa when the content of acetylacetone is 0.6wt%.
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