Plasma-spray-based manufacturing method of hot-pressing-resistant insulating mirror plate

Abstract

The invention discloses a plasma-spray-based manufacturing method of a hot-pressing-resistant insulating mirror plate. The method comprises the following steps: (1) carrying out acid-washing and degreasing on a substrate to be sprayed, and then drying the substrate; (2) carrying out corona treatment on the substrate; (3) spraying coating powder onto the surface of the substrate by a plasma spraying method, wherein the coating powder is prepared from the following materials in parts by weight: 100 parts of barium oxide, 30-32 parts of calcium oxide and 10-12 parts of silicon oxide. According to the method, the formula of the coating powder is newly designed according to the plasma spraying process, so that the formula is well applicable to the plasma spraying process; a layer of dense coating is formed on the surface of the substrate, and the coating is capable of enabling the insulating mirror plate to be frequently used in a hot-pressing process at high temperature and under high pressure; the insulating mirror plate also does not have expansion and shrink, and the surface of the insulating mirror plate is flat and wear-resistant, and is not sunken.

Description

technical field [0001] The invention relates to a method for manufacturing an insulating mirror plate, in particular to a method for manufacturing a heat-resistant and pressure-resistant insulating mirror plate based on plasma spraying. Background technique [0002] When manufacturing the main substrate of the circuit board (PCB), it is necessary to use a voltage machine to laminate multiple layers of different materials. The working principle of this voltage machine is to heat the processed glue through copper foil (or aluminum foil) Adhesive resin material, and press the multi-layer material by applying a certain pressure for at least half an hour, so as to make the circuit board base material, and in the process of pressing with an electric machine, due to cost considerations, a single pressing operation often needs to be done at the same time. Pressing multiple pieces of circuit board substrates, and in order to prevent multiple pieces of circuit board substrates from be...

AI Technical Summary

Problems solved by technology

[0003] The biggest difference between the mirror plate and the ordinary insulating plate is that there is a dense coating on the surface, which has a great influence on the performance of the mirror plate. In the lamination process, the performance requirements of the mirror plate are very high. During operation, both high temperature heat (greater than 300°C) and strong pressure (greater than 50MPa) are generated, which requires the mirror plate to have excellent thermal pressure resistance, that is, the mirror plate needs to have a very high limit temperature resistance And the ultimate pressure resistance, and, more importantly, the surface coating of the mirror plate must remain very smooth and smooth after repeated hot pressing, without depressions on the surface, and no expansion and contraction. This requirement cannot be realized in the process. Generally, the mirror plate of the prior art can be used for about 100 times at room temperature, and then the surface begins to be sunken, resulting in the failure of the mirror plate, and it can only be used about 50 times at high temperature. has expired

The main reason why the existing technology cannot meet this requirement is that the preparation process of this coating is not yet mature, more specifically, the combination of the coating formula and the coating construction process is not yet perfect.

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