Casting infiltration method capable of increasing hardness and wear resistance of castings

Abstract

A casting infiltration method capable of increasing the hardness and the wear resistance of castings comprises the following steps: preparing composite coating, coating the prepared composite coating on lost foams or sand molds corresponding to the set position of which the hardness and the wear resistance are needed to increase, forming a composite coating layer, closing the molds, then casting according to the known conventional method; after depanning, quenching and tempering to the composite coating layer position; the key point is that the composite coating is paste coating which is prepared by mixing 65-70wt% of diamond nanometer powder or ceramic nanometer powder with 35-30wt% of polyving alcohol condensation product and then adding water, and the composite coating is coated on the set position of lost foams or sand molds for 3-4 times to reach the set thickness. The invention has simple process; by adopting nanometer diamond powder, the hardness and the wear resistance on the set position of the castings can be greatly improved and no interfacial effect can be generated between the castings substrate and the penetration layer; in addition, the penetration layer part has strong impact resistance.

Description

technical field [0001] The invention relates to a casting method, in particular to a casting infiltration method using diamond nanometer powder and polyvinyl chloride condensation composite material. Background technique [0002] Cast infiltration is a traditional casting process, which is a casting method adopted to improve the hardness and wear resistance of castings, and plays a good role in improving the quality of castings. However, the common cast-infiltration casting method has a long preparation period. In the finished casting, there is an obvious interface between the casting and the infiltrated layer, and restricted by traditional materials, the hardness and wear resistance are limited, and the impact resistance is poor. Contents of the invention [0003] The object of the present invention is to solve the above-mentioned problems existing in the known infiltration method, and provide a nanocomposite infiltration method, which can greatly improve the hardness and...

AI Technical Summary

Problems solved by technology

However, the preparation period of the ordinary cast-infiltration casting method is long. In the finished casting, there is an obvious interface between the casting and the infiltrated layer, and restricted by traditional materials, the hardness and wear resistance are limited, and the impact resistance is poor.