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What are the introductions of common ceramic substrate PCB boards?

Word:[Big][Middle][Small] QR Code 2021/6/15     Viewed:    
  The ceramic substrate refers to a special process board in which the copper foil is directly connected to the surface(single-sided or double-sided)of the aluminum oxide(Al2O3)or aluminum nitride(AlN)ceramic substrate at high temperatures.The made ultra-thin composite substrate has excellent electrical insulation properties,high thermal conductivity,excellent weldability and high adhesion strength,can corrode various patterns like a PCB board,and has a large current-carrying capacity.Therefore,ceramic substrates have become the basic material for high-power power electronic circuit structure technology and connection technology.

  The emergence of ceramic substrate products has opened up a new development in the heat dissipation application industry.Due to the heat dissipation characteristics of the ceramic substrate,the ceramic substrate has the advantages of high heat dissipation,low thermal resistance,long service life,and withstand voltage.With the improvement of production technology and equipment,the rationalization of product prices has accelerated,and the application fields of the light-emitting diode industry have been expanded,such as indicator lights for household appliances,car lights,street lights and large outdoor billboards.The successful development of ceramic substrates provides better services for indoor lighting and outdoor lighting products,and makes the light-emitting diode industry a broader market in the future.

  Features.

  ◆Strong mechanical stress,stable shape;high strength,high thermal conductivity,high insulation;strong bonding force,corrosion resistance.

  ◆Good thermal cycle performance,50,000 cycles,high reliability.

  ◆It can corrode the structure of various patterns like a PCB board(or IMS substrate);no pollution,no pollution.

  ◆The operating temperature is wide-55℃~850℃;the thermal expansion coefficient is close to silicon,which simplifies the production process of power modules.

  Types of.


ceramic substrate


  |Divided by material.

  1.Alumina(Al2O3)

  Alumina substrate is a commonly used substrate material in the electronics industry,because compared with most other oxide ceramics,it has higher strength and chemical stability,rich sources of raw materials,suitable for various technologies and different shapes.Stone alumina substrates can already be customized in 3D.

  2.Beryllium oxide(BeO)

  The thermal conductivity is higher than that of metal aluminum,which is suitable for the occasions that require high thermal conductivity,but the temperature drops rapidly after the temperature exceeds 300℃.The important thing is that its toxicity limits its development.

  Beryllium oxide ceramics are ceramics with beryllium oxide as the main component.Mainly used for large-scale integrated circuit substrates,high-power gas laser tubes,transistor heat sink housings,microwave output windows,neutron reducers and other materials.

  Pure beryllium oxide(BeO)belongs to the cubic crystal system with a density of 3.03g/cm3.The melting point is 2570℃,and the thermal conductivity is high,which is almost equal to pure copper and pure aluminum.The thermal conductivityλis 200-250W/(m.K),and it has good thermal shock resistance.Its dielectric constant is 6~7(0.1 MHz).The tangent value of the dielectric loss angle is about 4×10-4(0.1 MHz).The big disadvantage is that the powder is very toxic and it is difficult to heal wounds in contact.Beryllium oxide powder is added to alumina and other ingredients and sintered at high temperature.The manufacture of such ceramics requires good protection measures.The volatility of beryllium oxide in a high-temperature medium with high water content will increase,and the volatility will increase with the increase of temperature,which brings difficulties to production,and some countries no longer produce it.However,the product has excellent performance and although the price is high,there is still considerable demand.

  3.Aluminum Nitride(AlN)

  AlN has two very important properties worth noting:one is high thermal conductivity,and the other is the expansion coefficient matching Si.The disadvantage is that even if there is a thin oxide layer on the surface,it will affect the thermal conductivity.Only by strictly controlling the materials and processes,can the AlN substrate with good consistency be produced.The domestic AlN production technology like Stoner rarely can be mass-produced.Compared with Al2O3,the price of AlN is relatively high,which is also a small bottleneck restricting its development.But as the economy improves and technology upgrades,this bottleneck will disappear.

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