April 13, 2017

Thermal spraying material selection guide

The correct choice of coating material is the key to ensure the work required for the properties of the coating. The coating materials selection, should first consider the working conditions and performance of workpiece coating required,but also consider the workpiece material, batch, economy and intends to adopt the method of thermal spraying coating.According to the function of the coating can be divided into corrosion resistant coating, abrasion resistant coatings, friction reducing and sealing coating, high temperature resistant thermal barrier coatings, insulation or conductive coating, the size of repair coating.

The surface of the workpiece after coating in the rejection caused by failure reason is often not a single factor, so can meet the requirements of working conditions and performance of the coating does not necessarily exist simple relationship should be analyzed in detail. According to the working conditions, and reference and experimental data on the coating structure, physical, chemical, mechanical and other comprehensive performance consider, in order to determine one or several kinds of coating materials.

Wear resistant coating is one of the main fields of the application of surface coating technology. Although there is a general relation between the hardness and wear resistance, hardness and wear resistance but not entirely representative of the surface coating. Because of the different types of wear properties of material is not the same, and in the wear and often accompanied by shock, corrosion influence of fatigue, and temperature.

The choice of surface coating materials can not blindly pursue high performance or high price of the coating material, resulting in unnecessary waste of material price can not be used as coating materials selection criteria, phase reaction prerequisite to meet the requirements of working conditions under the coating material as far as possible with low price, is particularly important in mass production for example, can use the material of Ni based alloy coating without cobalt base alloy coating materials.

In the selection of surface coating materials, the following steps can generally be carried out:

(1) analyze the working condition and the performance of the parts, understand the reason of failure and the requirement of the coating performance;

(2) lists the available coating materials;

(3) analysis of the compatibility between the selected material and the substrate material and the thermal spraying method;

(4) conducting laboratory or field tests if necessary;

(5) considering the service life, cost and factory conditions, determine the coating material;

(6) determine the surface coating method and develop the coating process

The following is a brief introduction of the commonly used coating performance, for the correct selection of spraying technology to provide reference

Generally speaking, the main purpose of using thermal spraying coating are the following: (1) corrosion resistant coating; wear resistant coating; (2) (3) and antifriction sealing coating; (4) high temperature resistant thermal barrier coating; (5) insulation or conductive coating; (6) the size of different repair coating and so on. The purpose of using different coatings.

Thermal sprayed coatings can also be used as electric conductors,such as printed circuit and the heating element. The contact thermal spray coating oxide and organic plastics can be used as an electrical insulator. The electrical properties of matrix material by spraying materials. Effects of spraying materials should generally be selected according to the known properties of the material and its use.

Posted by: hannahgwendolyn at 09:31 AM | No Comments | Add Comment
Post contains 550 words, total size 11 kb.




What colour is a green orange?




25kb generated in CPU 0.0114, elapsed 0.1953 seconds.
35 queries taking 0.1878 seconds, 104 records returned.
Powered by Minx 1.1.6c-pink.