Product Description:Fused silica, is an amorphous (glass) state of silica (quartz, silica). It is a typical glass with long-range disorder in its atomic structure. It offers its high service temperature and low thermal expansion coefficient through three-dimensional structural cross-linking.
Fused silica is produced by melting natural high-purity silica in an electric furnace at a temperature above 1760°C, followed by rapid cooling. This process converts crystalline silica into an amorphous glass melt. The melting temperature of fused silica is about 1713 ºC, the thermal conductivity is low, and the thermal expansion coefficient is almost the smallest among all refractory materials, so it has extremely high thermal shock stability. Therefore, the fused silica shell is rarely broken due to sudden temperature changes during the roasting and pouring process. It is an ideal refractory material for investment casting. It can be used as a refractory material for surface or back coating, as well as a sanding material.
Product advantages:
1. The price of fused silica is cheaper than that of zircon, and the density is much lower than that of zircon. Therefore, replacing zircon with fused silica can reduce the cost of shell making.
2. The raw materials of fused silica are selected, and then remelted by arc, and cristobalite is removed, so there are few impurities and high purity. So coating paste stability has never been a problem. Practice has proved that the stability of fused silica-silica sol coatings can usually last for more than 1 year.
3. High temperature crystallization and low temperature phase transformation make the casting surface easy to clean.
Product Cons:
1. The powder particle size distribution range is narrow, and the density is small, which is not conducive to the flow and dripping of the coating; due to the high transparency of the fused silica coating slurry, it is difficult for the operator to identify the thickness and uniformity of the coating.
2. As the surface layer of sand, the fused silica sand grains are polygonal in shape, and with low density, it is easy to bridge and form floating sand.
Main Cooperation Materials Manufacturers: CORNING, OHARA, SCHOTT, LEONI, AGC,HELLMA, NIKON,VITRON,C-LASER,ETC
Main Export Countries & Areas: Usa, Uk, Japan, Germany, Spain, France, Swiss, Korea, Russia, Pakistan, India, Portugal, Canada, New Zealand, Australia, Saudi Arab, Turkey, Finland, Poland ,etc.
Raytekoptics Extra value added services offered: 1). Optical workcraft & process solution design; 2). Rough processing raw materials; 3). Semi finishing raw materials; 4). Fabricate custom sizes and shapes; 5). Design and supply custom coatings; 6). Modify and resurface customer supplied materials; 7). Drill holes, notch glass and provide beveled substrates; 8). Precision polish optics with non-standard aspect ratios;
Payment Method: by T/T or Western Union. Delivery time: 7-10 days. Quality Warranty: Ruitaiphotoelectric(Raytekoptics) offersquality warranty for our optics products with "3R" policy. For any inferior-quality products, Ruitaiphotoelectric(Raytekoptics) is responsible for return, replacement and refund.
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