论文部分内容阅读
研究了BaZrO3作为钛合金熔模铸造面层材料的可行性。以自主合成的BaZrO3作为型壳面层的主要耐火材料,钇溶胶作为粘结剂,制备出了BaZrO3基复合型壳。探讨了BaZrO3涂料的粘度和悬浮率随粉液比、级配变化而变化的规律。通过分析经不同温度、时间焙烧后型壳的抗弯强度和断口形貌,最终确定了复合型壳的焙烧工艺。研究表明,当粉液比为3.0、细粉含量为50%~60%(质量分数)时涂料具有最好的粘度和悬浮性。焙烧温度为1 500℃、保温4h时,复合型壳具有最好的抗弯强度。将BaZrO3基复合型壳用于TiNi合金熔模精密铸造时,发现型壳与TiNi合金熔体润湿性差,二者间反应层很薄,说明BaZrO3是较为理想的钛合金精铸的面层材料。
The feasibility of using BaZrO3 as investment casting titanium alloy surface layer was studied. BaZrO3-based composite shell was prepared by using BaZrO3 synthesized by ourselves as the main refractory material of the shell surface layer and yttrium sol as the binder. The viscosity and the suspension rate of BaZrO3 coatings were investigated with the variation of powder ratio and gradation. By analyzing the bending strength and fracture morphology of the shell after calcined at different temperature and time, the roasting process of the composite shell was finally determined. Studies have shown that when the powder to liquid ratio of 3.0, the fine powder content of 50% to 60% (mass fraction) when the paint has the best viscosity and suspension. Calcination temperature of 1 500 ℃, heat 4h, the composite shell has the best flexural strength. When the BaZrO3-based composite shell was used for investment casting of TiNi alloy, it was found that the wettability of the shell and TiNi alloy melt was poor and the reaction layer between the two was very thin, indicating that BaZrO3 is the ideal titanium alloy casting surface material .