Method for preparing ultra nanometer diamond coating of ceramic valve core

Abstract

The invention belongs to a method for surface modification of a ceramic valve core, and particularly relates to a method for preparing an ultra nanometer diamond coating, which can improve the overall performance of a ceramic valve core matrix. The method comprises the following steps of: soaking the planar tap ceramic valve core in soaking solution; grinding the surface of the matrix by using diamond micropower suspension; and placing the ceramic valve core in a microwave plasma reaction cavity for growing the ultra nanometer diamond coating. The ultra nanometer diamond coating generated by the method has the advantages of high wear resistance and hardness, small frictional coefficient and thermal expansion coefficient, high self-lubrication, high chemical stability, no toxin and harmlessness and high hydrophobicity; and the ultra nanometer diamond coating can also improve the overall performance of the tap using the ceramic valve core, and the service life of the tap is prolonged by over 10 times. The tap and the oil-gas valve can be used in various mediums for a long time, are always kept tightly sealed and eliminate leakage, and are switched flexibly and light.

Description

technical field

[0001] The invention belongs to a method for modifying the surface of a ceramic valve core, in particular to a method for preparing a super nano-diamond coating for improving the overall performance of a ceramic valve core substrate. Background technique

[0002] Ultra-nano-diamond coating refers to an adhesive diamond film with a grain size of less than 40 nm in the coating. Compared with the traditional diamond film, its surface is smoother and smoother, and the hardness is basically close (up to 60GPa, while the traditional diamond film is about 80GPa), but the structure is different: it is based on sp 3 Hybridized carbon atoms account for the majority (sp 3 Hybrid carbon atoms are greater than 75%), and the grain size in the film layer with a certain network structure is less than 40nm.

[0003] Ceramic valve core is a new high-tech product that uses engineering ceramic materials to replace traditional rubber and steel as seals. Due to the high strengt...