subject: Polymer Materials Thermal Conductivity Additive: High Purity Submicron Aluminum Nitride Powder [print this page] Aluminum nitride is an atomic crystal belonging to the case of diamond-like carbon nitride. The maximum stability is about 2200 C. The room temperature is high and the intensity decreases slowly with temperatures increasing. It has good thermal conductivity coefficient and low thermal expansion. It becomes a good thermal shock material. With its strong ability of erosion resistance molten, aluminum nitride is an ideal crucible material for casting iron, aluminum or aluminum alloy.
Aluminum nitride is an electrical insulator with good dielectric properties. It is also promising for the electrical components. Due to the characteristics of aluminum nitride piezoelectric and silicon powder effect, the extensional stretching of the aluminum nitride crystal for surface acoustic wave detector. Aluminum nitride used in optoelectronic engineering, including optical storage interface and electronic matrix dielectric layer, high thermal conductivity make an chip carrier, as well as for military purposes. Ultra-fine aluminum nitride powder is mainly used to do the thermal conductive filler of polymer materials. It is very good for high thermal insulation filler in the electronic glue and conductive plastic. Application prospects are very broad. In LED heat dissipation and heat transfer.
Application of the aluminum nitride powder in the polymer material thermal conductivity is not optimistic. The main reason is that when using it, the heat conduction heat transfer effect is far from the actual test data. The aluminum nitride powder is a highly material to absorb moisture and oxygen, an exposure to moisture and oxygen, on the hydrolysis of oxidized and lost its thermal conductivity thermal performance characteristics, this is the current constraints of the aluminum nitride powder problem. The ultra-fine aluminum nitride powder, without surface treatment and modification, it is difficult with the polymer nickel powder material mixed evenly, making it difficult to form a good thermal conductivity channels, interpenetrating networks, it is difficult to solve the thermal conductivity of the polymer heat transfer.
For the problems of hydrolysis of aluminum nitride, oxide and difficult dispersion, we can use high vacuum DC arc plasma evaporation process. The evaporation of high purity aluminum targets nitride condensing, high purity ultra-fine aluminum nitride powder, in the production process above, add aluminum nitride-line surface treatment process, the surface resistance to hydrolysis groups grafted polymer coupling agent, macromolecular the dispersant coupling and surface crosslinking reaction mechanism of aluminum nitride powder surface waterproof and anti-oxidation treatment, then the aluminum nitride powder is preprated. In the use of the process, the resistance to hydrolysis and oxidation, greatly improving the thermal insulation properties of the aluminum nitride powder, aluminum nitride powder after modification of a good, well mixed with the polymer material to form a very dense thermal conductivity channel and interpenetrating network, to maximize the play of the thermal conductivity, thermal efficacy.
Applying directions of modified ultra-fine aluminum nitride powder are as follows: heat silica gel and thermal conductivity of epoxy resin, LED packaging materials; conductive plastic PA, PPS, the PE, the PC; high thermal conductivity of silicone rubber, fluorine rubber copper powder(FCu) applications and for the field of electronics and electrical industries. Other application areas are : fine aluminum nitride powder can be used for melting non-ferrous metals and semiconductor materials, gallium arsenide crucible, the evaporation boat, thermocouple protection tube, high temperature insulation, microwave dielectric materials, high temperature and corrosion-resistant structural ceramics and transparent to microwave ceramics, as well as the application of polyimide resin, the LED heat dissipation, thermal insulation of mica tape, thermal grease, high thermal conductivity of the insulation varnished cloth, as well as conducting oil, high thermal conductivity slot insulation and high thermal conductivity of the impregnated resin.
