Alumina powder can be used in abrasives, ceramics, medicine, cosmetics, aerospace, thermal media, etc. Today the editor will talk about a very small class of alumina applications: thermally conductive alumina powder for electronic potting adhesives in thermally conductive media.

First of all, electronic encapsulants are mainly divided into three categories: silicone encapsulants, epoxy encapsulants, and polyurethane encapsulants. Dongchao mainly provides corresponding thermal conductivity solutions for the three encapsulants.

Potting characteristics

Silicone potting compound:
advantage:
1. It becomes semi-solidified after curing, and has excellent resistance to alternating heat and cold.
2. After cracking, it will automatically heal to a certain extent, and the moisture-proof and waterproof capabilities still function.
3. No shrinkage and no toxicity.
4. The curing time can be controlled according to the needs.

Disadvantages:
Poor adhesion
Scope of application:
Suitable for potting high-end precision/sensitive electronic source devices under various extreme conditions.
Silicone potting compound is the most widely used potting product. By adding heat-conducting filler to the matrix material, silicone rubber is given corresponding thermal conductivity.

Epoxy resin potting compound
advantage:
1. Has excellent high temperature resistance
2. Simple operation, relatively stable before and after curing
3. Strong adhesion
Disadvantages: poor resistance to alternating heat and cold, easy to crack under impact.
Scope of application:
Mostly used in southern warm areas or indoor electronic products.

Polyurethane encapsulant

advantage:
1. Strong low temperature resistance
2. The viscosity is between silicone and epoxy encapsulant
3. Strong toughness

Disadvantages:
1. Poor high temperature resistance
2. It is easy to foam, generally need vacuum potting
3. Easy to change color
Scope of application:
Generally used in areas with relatively low temperatures, or electronic products with low heat.

SAT NANO can supply the alumina powder micron particle 1-100um, spherical type, good quality and low price, please feel free to contact us at admin@satnano.com