Substrate for printed circuit boards
substrate for printed circuit boards
Printed circuit board (PCB) refers to the substrate carrying electronic components, and the substrate is the basic material of the circuit board. The manufacture of the printed circuit is completed on the substrate.
The base material mainly refers to the dielectric material, which is composed of resin reinforcements and fillers. The substrate is mainly based on the insulation part of the substrate as the classification standard of the common raw materials for electric boards glass fibreboard and various types of plastic boards. And the PCB system Manufacturers usually use
Make "adhesive tablets" for use.
Glass-assisted fiber national machine materials and mesh composition
The insulation of the
To ring the Arrow Street and the Steel Arrow
A metal box with a safety plate
Different thickness
Body of foil, in which
Divided into the following four categories.
Different solder, production
Properties of copper clad substrate
A plate scale made of copper foil
Steel substrates. Substrate plate
Phenolic paper based copper
The performance is also very different.
Copper base material
Same box substrate.
It's activated by insulation.
Cloth, coated with electrolytic copper case on its surface or on both sides. This paper or brocade fiber is dipped to match the tree tire, and the two sides are covered with unbroken glass
Aldehyde-resistant steel foil substrates as shown in figure 3.1
Made by hot pressing.
However, the high frequency and the mechanical strength are high, and the mechanical strength is low.
1.2 as shown, it is generally a discussion
Light yellow or black yellow price hard, widely used,
Easy water absorption and high temperature resistance
In general civil electronics such as radios
The performance is lower than that of surface insulation. Its price is easy
Epoxy phenolic glass silk foil substrate
It is not suitable for use in bad environment.
Made by hot pressing. Figure 3.1.3
Epoxy phenolic glass
It is made of alkali-free glass Cloth impregnated with aldehydes resin in electrolytic copper case,
The grease adhesive force is strong, the electrical insulation performance is good, not only the copper box substrate is turquoise green and has the transparent sense, because of the epoxy tree Can work at a frequency of up to 100 MHz,Chemical solvent, moisture resistant,Resistant to high temperature, suitable for use in harsh environments, this kind of board,commonly used in television, advanced instruments and so on, but its price is more expensive.
Epoxy glass cloth steel box substrate. It is made of epoxy resin of glass cloth spread with dicyandiamide curing agent and coated with electrolysis
Purple copper foil, made by hot pressing. The substrate has good transparency, good electrical and mechanical properties and high temperature and moisture resistance.
PTFE glass cloth copper foil substrate. It is impregnated with tetraneon dispersion emulsion by alkali-free glass cloth, coated with
The oxidized copper electrolytic box is made by hot pressing. It has excellent dielectric properties and chemical stability.
A new type of high temperature and high insulation material. The biggest feature is a wide range of adaptations, suitable for cutting-edge products and high frequency microwave
In the device.
When selecting the substrate of PCB, we should first consider that the substrate should have good electrical performance and sufficient mechanical strength.
