In the modern metal processing industry, almost all will be applied to thermal spraying process to extend the service life of machinery. The application of powder thermal spraying is more frequent, so what advantages does it compare to ordinary thermal spraying? Now let's have a chat about this problem.

1, the shape of powder particles mainly refers to the geometry of particles and their surface characteristics. Using the axial ratio (statistics) of the short axis and the axis of the elliptical spherical particles to evaluate, the higher the powder solid fluidity of the sphere, the better the geometry can be measured. Powder balls are not only related to the atomization process parameters, but also to the chemical composition of the powder itself. Therefore, different kinds of powders have different degrees of balls, but also to ensure a smooth and uniform powder spraying process.

The atomization method of metal powder thermal spraying particles sometimes has different sizes, some holes pass through the surface, and some holes are closed in the pellets. If incorrect, spraying will directly affect the quality of the coating. Such loopholes are usually observed by optical microscopy. The surface is surface color, smoothness and so on.

2. Particle size of powder. The selection of grain size and range of powder is mainly determined by the spraying process method and the parameters of spraying process specification, even the grain size range of powder is the same, but the grain size composition ratio is not necessarily the same, for example: although the grain size of powder is in the range of 125-50 micron (- 120 account ~320 account) but 100 micron The proportions of powders with different grain sizes of m~125 micron and 80 micron~100 micron and 50 micron~80 micron are different. The range and composition of powder particle size have direct influence on coating quality, apparent density and fluidity level.

3. Bulk density powder. When bulk density refers to the bulk filling powder powder per unit volume. The apparent density of powders and spheres, the size and quantity of pores, the size and other parameters of the powders also affect the quality of the coating.

4. The fluidity of powder liquid quantitative powder free flow refers to the standard hopper with the required aperture. The time required to flow through the standard 50 g powder hopper with the aperture of 2.5 mm is usually expressed by the time required. It can affect the process of spraying and spraying efficiency.

The above is the advantage of spraying powder thermal spraying material. Do you all understand it?