JPH03278587A - Metal base metal-foiled laminated board - Google Patents

Abstract

PURPOSE:To make it possible to improve both humidity and heat resistance by forming a plasma spray coated film on a bond surface of a metal board. CONSTITUTION:A plasma spray zinc coated film 3 is formed on an aluminum board 4. Then, the zinc coated surface by spraying is degreased-treated. After the treatment is over, a prepreg is internally placed on the plasma-sprayed surface of the aluminum board so that a copper foil 1 may be placed on the surface.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a metal foil-clad laminate based on a metal substrate used as a printed circuit board.

Conventional technology A metal foil-clad laminate based on a metal substrate uses prepreg to bond and integrate the metal substrate and the metal foil. Prepreg is a sheet-like base material impregnated with thermosetting resin and dried.
It is placed between the metal substrate and the metal foil and heated and pressurized. The bonding surface of the metal substrate is subjected to a blasting process to roughen the surface and increase bond strength.

Problems to be Solved by the Invention In the metal foil-clad laminate described above, there is a risk that the roughened surface of the metal substrate easily absorbs moisture and deteriorates. Further, the prepreg layer becomes an insulating layer by heating and pressurizing, but when subjected to high heat treatment, there is a problem that peeling occurs between the insulating layer and the metal substrate.

An object of the present invention is to improve moisture resistance and heat resistance in the metal base metal foil clad laminate.

Means for Solving the Problems The metal-based metal foil-clad laminate according to the present invention is a sheet-like base material impregnated with a thermosetting resin and dried, and then a metal substrate and a metal foil are bonded together by heat and pressure. Figure 1 shows a cross-sectional view of the plasma sprayed coating formed on the adhesive surface of the metal substrate. 3, gold [Ffi
l is integrated with adhesive.

Active plasma spraying involves supplying a spraying material into an ultra-high temperature plasma jet of inert gas and melting it to form a sprayed coating on a metal substrate.Since it is carried out in an inert gas, the metal substrate is hardly oxidized. The adhesion strength of the sprayed coating to the metal substrate is also very high, usually 400 to 800 kg/c.
4, it is possible to prevent the treated layer from deteriorating due to moisture absorption.

Further, the surface of the plasma sprayed coating has a complicated uneven shape, and the anchoring effect of the insulating layer formed of prepreg to the plasma sprayed coating is large. This prevents the metal substrate and the insulating layer from peeling off when subjected to heat treatment, improving heat resistance.

Examples The thermal spraying materials used in carrying out the present invention are metals such as zinc and tin, and high melting point materials such as ceramics, porcelain, and cermets. The sheet-like base material impregnated with a thermosetting resin and dried to form a prepreg is a woven or nonwoven fabric of glass fiber, or a woven fabric or nonwoven fabric of aramid fiber.

Example 1 A 20 μm thick zinc coating was formed on a 0 mm K aluminum plate by plasma spraying. Thereafter, the surface of the zinc spray coating was degreased.

Separate prepreg was prepared as follows.

An epoxy resin varnish consisting of 45 parts by weight of bisphenol type epoxy resin, 40 parts by weight of brominated epoxy resin, 15 parts by weight of phenol novolac type epoxy resin, and 3 parts of dicyandiamide was prepared, and a 0.18 mm thick plain-woven glass cloth was impregnated with this and dried. A prepreg with a resin content of 50% by weight was prepared.

A 35 μm thick copper foil was placed on the Blazne sprayed surface of the aluminum plate with one sheet of the prepreg interposed therebetween, and this was sandwiched between mirror plates and molded for 60 minutes at a temperature of 170 cm and a pressure of 80 kg/cd. .2 mm thick aluminum-based copper-clad laminate.

Conventional Example 1 Instead of forming a thermal spray coating on an aluminum plate, a sandblasting machine was used to roughen the surface of the adhesive surface. Other than this, an aluminum-based copper-clad laminate having a thickness of 1.2 mm was prepared in the same manner as in Example 1.

Table 1 shows the characteristics of the laminates of the example and the conventional example.

Table 1 PC-2: Pressure force - 2 hour treatment Effect of the invention Table 1 shows the state of peeling between the aluminum substrate and the insulating layer. Peeling is less likely to occur. Furthermore, even after high-temperature treatment (pressure cooker), peeling does not easily occur, and it is found that the film has excellent moisture resistance.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a metal base metal foil clad laminate according to the present invention. 1 is a metal foil, 2 is an insulating layer, 3 is a plasma sprayed coating, 4 is a metal substrate

Claims (1)

[Scope of Claim] A metal base metal foil clad laminate in which a metal substrate and metal foil are bonded and integrated by heat and pressure through a prepreg prepared by impregnating a thermosetting resin into a sheet-like base material and drying the metal substrate. A metal-based metal foil-clad laminate characterized by having a plasma sprayed coating formed on the adhesive surface.