LED lighting fixture aluminum substrate
Aluminum substrate, abbreviated as ALPCB in English, is the abbreviation of aluminum-based copper-clad circuit board, which is a kind of metal-based circuit board (also known as: MCPCB). After that, it quickly became the preferred PCB for the light source board of LED lighting lamps. Based on the production experience in recent years and the application information of lamps and lanterns, the topics related to aluminum substrates are thrown here.
A: Common structure of metal substrate Metal substrate, as shown in schematic a, common structures are 1: conductive layer (also known as copper foil layer), used for circuit layout and component pad positions; 2: insulating heat dissipation layer (commonly ceramic Powder PP glue), as the name suggests, play the role of insulation and heat dissipation 3: Metal base (commonly aluminum base, copper base), as the carrier of copper foil and insulating layer, aluminum base has high cost performance and good machining performance in the market share of metal substrates far ahead.
B: The general performance of aluminum substrates is more commonly used as a PCB for LED lighting fixtures. We are interested in knowing more about aluminum substrates. The aluminum substrate is based on aluminum alloy, and its thermal, electrical and mechanical properties are particularly important. Common parameters such as: specific heat capacity, thermal conductivity, melting point range, linear expansion coefficient, electrical conductivity, resistivity, hardness, fatigue strength, tensile strength , elastic modulus, elongation, cutting force, etc. In the case of conforming to the national standard, the thermal conductivity is particularly important. Its concept and measurement method may be referred to the schematic diagram b, which is more intuitive.
At present, the thermal conductivity of aluminum-based copper clad laminates produced by different manufacturers is quite different. If the above measurement method is used, the thermal conductivity of the mainstream aluminum-based copper clad laminates in the domestic market is mostly between 0.2-1.5W/M-K, and the cost difference is easy to induce incorrect thermal conductivity. Therefore, when considering thermal conductivity, you may wish to refer to the price positioning of aluminum substrates and third-party testing.
In daily production, aluminum substrate orders should indicate the following elements as much as possible:
1. Product Model/Material Number/Order Number: The information is clear and self-interested, and many departments inside and outside the company can easily cooperate!
2. Plate type: single-sided/double-sided aluminum-based copper clad laminate, plate thickness and copper foil thickness (OZ): H, 1, 2 (ie 18/35/70mil), and there are many plates below 18mil;
3. Process treatment, including surface treatment, solder mask color, text color and molding method; whether it is a single molding or imposition shipment (the conventional process edge is generally 5MM, do not forget to add MARK points and patch process holes);
In addition, such as delivery time, quantity and special requirements, most of the two parties communicate and sign the contract when placing an order, so that suppliers can cooperate more effectively and restrain each other. The order structure of PCB manufacturers at different times may be different. The difference is that It is normal, please check carefully when cooperating.