The application discloses a soluble
ceramic core for growing
mullite whiskers in situ from low-grade
ball clay, and raw materials of the soluble
ceramic core include low-grade
ball clay,
sodium chloride and water.The method is as follows: the low-grade
ball clay is dried, sieved, mixed with
sodium chloride, sprayed and granulated with water, pressed into a mold, moved into a
muffle furnace, heated to 300 DEG C at a rate of 5 DEG C / min, kept for 0.5 h, sintered from 300 DEG C to 725-775 DEG C at a rate of 3 DEG C / min for 1.0 h, then cooled to 100 DEG C and taken out, so as to obtain a soluble
ceramic core for growing
mullite whiskers in situ.The application has the advantages that the core is made by a pressing and
sintering process, the process is simple,
mullite whiskers are grown in situ in the ceramic core during the
sintering process, the soluble ceramic core is reinforced and toughened,
sodium chloride is used as a binder, there is no
pollution, and the comprehensive performance is excellent.The bending strength of the soluble ceramic core is 7-15 MPa, the tensile strength is 2-6 MPa, the soluble ceramic core can be scattered at a
water temperature of 90 DEG C, and the application provides a new technology for ceramic
casting development.