LED lighting fixture aluminum substrate introduction
Aluminum substrate, referred to as ALPCB in English, is the abbreviation of aluminum-based copper-clad circuit board. It belongs to metal-based circuit board (also known as MCPCB). Compared with common FR4 glass fiber board, it has good thermal conductivity and high cost performance. After that, it quickly became the preferred PCB for LED lighting fixtures. Based on the production experience and lighting application information in recent years, the topic of aluminum substrates was thrown here.
A: Common structural metal substrate of metal substrate, as shown in diagram a, common structure has 1: conductive layer (also known as copper foil layer), used for circuit arrangement and component pad position; 2: insulating heat dissipation layer (commonly used for ceramics) Powder PP glue, as the name suggests, play the role of insulation heat dissipation 3: metal base layer (commonly aluminum-based, copper-based), as a carrier of copper foil and insulation layer, aluminum base in the market share of metal substrate with high cost performance and good machinability Leading the way.
B: Conventional performance of aluminum substrate As the most commonly used PCB for LED lighting, we are interested in knowing more about aluminum substrates. The aluminum substrate is made of aluminum alloy, and its thermal, electrical and mechanical properties are especially important. Common parameters such as specific heat capacity, thermal conductivity, melting point range, linear expansion coefficient, electrical conductivity, electrical resistivity, hardness, fatigue strength, tensile strength , elastic modulus, elongation, cutting force, etc. In the case of meeting the national standard, the thermal conductivity is especially important. The concept and measurement method may refer to the 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 adopted, the thermal conductivity of the mainstream aluminum-based copper clad laminates in the domestic market is mostly between 0.2-1.5W/MK, and the cost difference is easy to induce the thermal conductivity is wrong. Etc., so when considering the thermal conductivity, you may wish to refer to the aluminum substrate price positioning and third-party testing.
In daily production, the aluminum substrate orders should indicate the following elements as much as possible:
First, the product model / item number / order number: This information is clear, self-interested, many departments inside and outside the company easy to cooperate!
Second, the type of sheet: single-sided / double-sided aluminum-based copper clad, sheet thickness and copper foil thickness (OZ): H, 1, 2 (ie 18/35/70mil), more than 18mil of sheet;
Third, the process, including surface treatment, solder mask color, text color and molding method; is a single molding or imposition shipment (conventional process side is generally 5MM, do not forget to add MARK point and patch process hole);
In addition, such as delivery, quantity and special requirements, most of the two parties communicate and sign the contract when the order is placed, so that the suppliers can cooperate with each other more powerfully and restraint each other. The order structure of PCB manufacturers at different times may be different. Very normal, please be careful when you cooperate.
Product name Zinc Phosphate
CAS No 7779-90-0
EC No 231-944-3
Chemical formula Zn3(PO4)2.2H2O
Appearance White Powder
Storage Keep the product in a tightly closed container ,Isolate form any source of heat or ignition and moisture
Packing unit 25kg Poly Propylene bag & 500kg Poly Propylene bag,
Any size customers want.
Application Material for anti-corrosion paint used in container,Ship and steel structures .Electronic materials
Goods characteristics White Powder.
Soluble in acid or alkali solution ,insoluble in water or alcohol.
Zinc Orthophosphate Powder, Anti-Corrosion Zinc Phosphate, Rust Preventive Zinc Phosphate, Antirust Paint Zinc Phosphate
shijiazhuang city xinsheng chemical co.,ltd , http://www.xsphos.com