锌合金压铸用二元复合水溶性盐芯的制备与性能
发布时间：2019-03-12 11:11
【摘要】：针对复杂内腔锌合金压铸件难清理及型芯强度要求高的问题,以高熔点盐氯化钾和低熔点盐硝酸钾组成混合盐为制芯材料,采用熔融重力浇注工艺制备了高强度二元复合水溶性盐芯.对比分析了氯化钾盐芯、硝酸钾盐芯和20%KCl-80%KNO3二元复合水溶性盐芯的性能特征.采用扫描电镜和X射线衍射等测试方法分析了水溶性盐芯的微观形貌与物相组成.研究结果表明:与单质盐芯相比,二元复合盐芯综合性能更佳,其表面基本无裂纹与褶皱,抗弯强度可达21.2 MPa,24 h吸湿率为0.568%,80℃的水溶速率可达208.63 kg·min-1·m-3.复合盐芯在裂纹扩展时走向发生了偏转,这是复合盐芯抗弯强度提高的主要原因.
[Abstract]:The high-strength binary composite water-soluble salt core is prepared by using the high-melting-point salt potassium chloride and the low-melting-point salt potassium nitrate as the core-making material, aiming at the problems of difficult cleaning of the complex inner-cavity zinc alloy die casting and high strength requirements of the core-shaped core. The performance characteristics of potassium chloride salt core, potassium nitrate salt core and 20% KCl-80% KNO3 binary composite water-soluble salt core were compared and analyzed. The micro-morphology and phase composition of the water-soluble salt core were analyzed by means of SEM and X-ray diffraction. The results show that the comprehensive performance of the binary composite salt core is better than that of the elemental salt core. The surface is free of cracks and folds, the bending strength can reach 21.2 MPa, the moisture absorption rate of 24h is 0.568%, and the water-soluble rate of 80 鈩，
本文编号：2438722
[Abstract]:The high-strength binary composite water-soluble salt core is prepared by using the high-melting-point salt potassium chloride and the low-melting-point salt potassium nitrate as the core-making material, aiming at the problems of difficult cleaning of the complex inner-cavity zinc alloy die casting and high strength requirements of the core-shaped core. The performance characteristics of potassium chloride salt core, potassium nitrate salt core and 20% KCl-80% KNO3 binary composite water-soluble salt core were compared and analyzed. The micro-morphology and phase composition of the water-soluble salt core were analyzed by means of SEM and X-ray diffraction. The results show that the comprehensive performance of the binary composite salt core is better than that of the elemental salt core. The surface is free of cracks and folds, the bending strength can reach 21.2 MPa, the moisture absorption rate of 24h is 0.568%, and the water-soluble rate of 80 鈩，
本文编号：2438722
本文链接：https://www.wllwen.com/kejilunwen/jiagonggongyi/2438722.html
