JPS6164869A - Barium phosphate-base powdery thermal spraying material - Google Patents

Abstract

PURPOSE:To obtain the titled thermal spraying material forming a waterproof glassy sprayed film having fine surface luster by pulverizing and classifying a glass base material contg. a specified amount of P2O5 besides barium phosphate as the principal component. CONSTITUTION:A two-component type glass base material contg. 40-70mol% P2O5 besides barium phosphate such as barium metaphosphate as the principal component is melted, solidified, pulverized, and classified to obtain a thermal spraying material forming a transparent and waterproof glassy sprayed film having fine surface luster. When about 0.01-5% transition metallic oxide such as V2O5, CoO or Fe2O3 is added to the glass base material before melting, a thermal spraying material forming a colored sprayed film having superior decorativeness can be obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a barium phosphate powder thermal spray material that forms a two-surface glossy and water-resistant vitreous thermal spray coating by thermal spraying.

Prior Art Thermal spraying, in which semi-molten wire or powder of metal or metal oxide is sprayed onto the surface of the workpiece and is sprayed in close contact with the surface of the workpiece, has become widely used along with the advancement of plasma spraying technology that can obtain high temperatures (2000). The number of types of thermal spray materials, such as metals, ceramics, and cermets, is increasing.

Problems with the Prior Art In recent years, there has been an increasing demand for thermal spray materials that form glassy thermal spray coatings with surface roughness as decorative thermal spray coatings. However, silicate glass and silicate glass have a high melting point and a high viscosity, so when sprayed directly onto the surface of a workpiece, the molten droplets do not spread well, resulting in a rough surface. Therefore, a completely fused and transparent film cannot be obtained.

Many of the other low-melting point glasses are hygroscopic, resulting in coatings with low water resistance, and none of them have been put into practical use (2).

Object of the invention and implantation The object of the present invention is to provide a molten H'rt1. coating material which can be formed with a glass Jyi coating having excellent surface gloss (two excellent properties and water resistance) by thermal spraying.
5 is 40 to 70 moles, dissolved and surface-formed nine phosphate bar 11
Um-based substance? Phosphate barium-based spray powder material 1 made by crushing and classifying a binary glass base material as the main component: Yes.

Specific constitution and operation of the invention
P2O51 includes simple compounds in which P205 is 40 to 70 mol %, such as barium metaphosphate, as well as compositions in which P2O5 falls within the above range.

Barium orthophosphate (Ba3(PO4'21) and barium pyrophosphate (Ba2P20.) each have P2o5 of 2
5 molar ratio and 33 molar ratio, it is not suitable as a thermal spray material of the present invention. The reason for this is that if the P2O5 content is less than 40 molar, it will deviate from the vitrification region and will crystallize, becoming clumpy and failing to form a glassy, glossy film. If the P2O5 cuff exceeds 0 molch, the hygroscopicity will be even worse and it will not be practical (for two-day use).

The thermal spray material of the present invention is obtained by melting a composition having P2O5 in the above range in a crucible, cooling and solidifying it to produce a binary glass base material, and crushing and classifying the base material.

9. When melting (2. P2O5, coo b Ft
0.01 to 5 mol of transition metal oxide such as i1203 is added to the solution W! After XC, the material is solidified and pulverized to obtain a thermal spray material that forms a colored thermal spray coating.

In addition, S is substituted for the transition metal oxide such as V2O5.
102% Al103, B203k Ca0%
Even if H60 or the like is added and melted, a similar coloring effect can be obtained.

The above-mentioned thermal spraying material is extremely excellent for decorative purposes because it forms a beautiful thermal sprayed film after being transparent or colored on the processed surface.

Note that calcium phosphate-based materials using other alkaline earth metals instead of barium have a high melting point and do not produce beautiful films.

Examples and Comparative Examples [Example 1] Barium metaphosphate was placed in a crucible and melted, cooled and solidified to create a glass base material, which was crushed and classified to form a 53% glass base material.
A sprayed material with a diameter of ~10μ was obtained. When this was plasma sprayed onto a stainless steel plate, the entire surface melted together to form a highly glossy sprayed coating.

After soaking it in water for a few months, my friend observed no change.

Additionally, when melting metaphosphoric acid, 0.1 molt of P2O5 or C00 is added to produce thermal spray materials.

When this molten material was thermally sprayed onto a stainless steel print, a glossy thermal sprayed coating of emerald green or cobalt blue was obtained. BaQ and P2O5 were placed in a crucible (:) and melted and mixed, cooled and solidified to produce a two-element glass base material, which was crushed and classified to obtain a thermal spray material with a diameter of 53 to 10 μm.

This was subjected to plasma spraying on a step VV plate to form a sprayed coating, which was then observed.

[Comparative Examples 1 to 4] P2O5 is 35 mol, 25 mol, 75 mol, 85
Formulated with BaO so as to have a molar relationship, Examples 2 to 4 were used.
The sprayed coatings were formed and observed in the same manner as in Example 2-3 and Comparative Examples 1 to 4, and the results are shown in Table 1.

Table 1 Effects of the Invention As described above, the thermal spraying material according to the present invention forms a smooth, glossy glassy transparent or colored thermal spraying coating, and is extremely useful as a thermal spraying material for forming decorative coatings. It is excellent.

Claims (1)

[Claims] A barium phosphate powder thermal spray material made by crushing and classifying a binary glass base material whose main component is a melted and solidified barium phosphate material containing 40 to 70 mol% of P_2O_5.