Hard high-damping coating preparation process used for surface of high-temperature damping part

Abstract

The invention discloses a hard high-damping coating preparation process used for the surface of a high-temperature damping part. According to the process, firstly, the surface of the part is subjected to decontamination treatment; secondly, the surface of the part is coarsened by adopting surface sand blasting treatment; then the part subjected to sand blasting is preheated; the surface of the part is subjected to spraying by adopting a low-pressure plasma spraying method, wherein the material system of a coating is any one of an NiCr system high-temperature alloy coating, an FeCr system ferromagnetic coating and a YSZ ceramic coating; and subsequently, the coating is subjected to vacuum annealing treatment. A coating composite structure prepared by adopting the process not only has high damping performance, but also has high mechanical performance, can bear large stress, and meanwhile is wide in temperature application range; and the damping performance of the damping structure is obviously higher than that of a bulk damping material. The coating is uniform; and the bonding strength of the coating with a matrix is high. The process has the advantages that the implementation cost is low; the operation is simple and convenient; the yield is high; the comprehensive performance of products is high; and the like.

Description

technical field [0001] The invention relates to the preparation of a damping coating, in particular to a preparation process for a hard high damping coating used on the surface of a high temperature damping part. Background technique [0002] Vibration control and noise suppression of dynamic systems are extremely desirable in the design of aviation, aerospace, ships, military and other industries. Excessive vibration and noise may cause structural damage, environmental degradation, affect the normal work of airborne equipment, affect combat effectiveness, and even cause catastrophic damage. In most cases, material strength and damping performance are contradictory. In fact, the commonly used materials for aero-engine blades such as aluminum alloy, martensitic stainless steel, titanium alloy and other high-temperature alloys have poor damping performance due to excessive consideration of strength factors. Poor, damping performance Q -1 Often less than or only in the 10 -3...

AI Technical Summary

Problems solved by technology

[0004] Existing damping coatings are generally made of polymer materials. Although the damping performance is significantly improved, they cannot withstand high temperatures.

The thickness of the coating cannot be determined. If the coating is too thick, there are too many internal defects and the bonding force is poor. Not only can the damping performance not be fully exerted, but the peeling of the coating will lead to aggravated wear on the surface of the workpiece, which will eventually aggravate the damage of the workpiece.

Images