Fused quartz powder is made by high-temperature melting and rapid cooling of natural quartz, featuring ultra-low thermal expansion, high purity, excellent thermal stability, superior insulation and low dielectric loss. It is mainly used in electronic encapsulation, high-grade refractory materials, precision ceramics, semiconductor packaging, epoxy casting materials and new energy insulation fields. Surface modification is essential for the following core reasons:
Improve compatibility with organic resin matrix
Unmodified fused quartz has abundant hydrophilic hydroxyl groups on the surface, leading to poor wettability with epoxy resin, silicone resin, phenolic resin and other organic binders. Surface modification changes its surface from hydrophilic to lipophilic, forming stable interfacial bonding, effectively increasing filling ratio and reducing resin consumption.
Reduce water absorption and upgrade electrical insulation
Raw fused quartz easily absorbs moisture in the air, which will decrease insulation performance, breakdown voltage and service safety of electronic components after filling. Modification seals surface active hydroxyl groups, greatly lowers moisture absorption, and maintains stable insulation performance under high temperature and humid environment.
Stabilize low thermal expansion performance
Fused quartz owns inherent low expansion advantage. After uniform surface treatment, powder disperses evenly in composites, avoiding local stress concentration, keeping overall thermal expansion coefficient stable, and preventing cracking and deformation during cold and hot cycles, which is critical for precision electronic parts and aerospace materials.
Solve ultrafine powder agglomeration problem
Superfine fused quartz powder is easy to agglomerate seriously. Surface modification can disperse agglomerated particles effectively, improve uniformity in slurry and casting materials, and produce high-density, defect-free finished products.
Reduce curing shrinkage and internal stress
Modified fused quartz can be added in higher proportion, reduce resin content, obviously lower curing shrinkage rate of the system, avoid cracks, warpage and internal stress in electronic packaging products, and improve finished product yield.
Enhance mechanical and comprehensive durability
Good interfacial adhesion after modification greatly improves bending strength, compressive strength and impact resistance of composites. Meanwhile, it strengthens acid and alkali corrosion resistance, extending service life of high-temperature refractory materials and industrial insulation components.
Meet differentiated functional application demands
Different coupling agents can endow fused quartz powder with targeted properties: amino silane for epoxy system, vinyl silane for composite resin, hydrophobic modifier for outdoor high-insulation products, to fully match semiconductor, photovoltaic, high-voltage electrical and other high-end industry standards.
In short, unlike common crystalline quartz powder for general filling, fused quartz powder modification focuses more on stabilizing thermal performance, improving electrical insulation, lowering shrinkage stress and ensuring high-end product reliability, which is an indispensable process for high-grade fused quartz application.
