热压注双层壁陶瓷型芯用SiC增强水溶蜡型芯性能和水溶解行为OA

Water-soluble paraffin wax is a critical transitional material for fabricating next-generation double-wall ceramic cores using the hot-pressing injection process,and its mechanical properties,thermal stability,and dissolution behavior are key factors governing its engineering applicability.In this study,the water-soluble wax core specimens were prepared with varying SiC particle contents as the reinforcing phase,and the effects of SiC contents on the mechanical properties,thermal stability,and dissolution behavior of the water-soluble wax cores were systematically investigated.In addition,mechanisms underlying the effects of pH and temperature on the dissolution behaviors of the optimized water-soluble wax core materials were examined.The results show that the water-soluble wax core containing 0.9wt.%SiC exhibits the best overall performance,with a room-temperature flexural strength of 13.5 MPa,12.5%higher than that of the unreinforced core;and its thermal deformation ratio is decreased to 12%,representing a 56.4%reduction compared with that of the unreinforced core,and indicating significantly improved dimensional stability of the water-soluble wax core.However,in an acidic solution with pH=2,the dissolution time of the 0.9wt.%SiC-reinforced water-soluble wax core specimen increases to 17.5 min,34.6%longer than that of the unreinforced core;under strongly acidic conditions(pH=1),the dissolution time is decreased to 16 min;as the solution temperature increases from 15 ℃ to 35 ℃,the dissolution time is sharply decreased from 15.8 min to 6.9 min,corresponding to a reduction of 56.3%,indicating that increasing temperature and decreasing pH can effectively accelerate the dissolution of SiC-reinforced water-soluble wax cores,enabling efficient core removal while maintaining adequate mechanical strength.