The thermal expansion coefficient of white fused aluminum oxide is related to its quality. High quality white fused aluminum oxide is of lower thermal expansion coefficient. Low sodium WFA is featured with high Aluminu oxide content, high corundum phrase, low Na2O. It has a lower expansion rate than normal WFA even at high temperatures.
White fused alumina (other name: white corundum or white aluminum oxide) is an excellent material in the field of power plant maintenance. It is not only suitable for surface treatment, but also a base material for other usage.
White fused alumina sand & powder are both made by crushing and sorting large pieces of smelted white corundum. It is difficult to distinguish the quality from the appearance of WFA sand and powder. However, we can judge white fused alumina quality grade from the appearance of WFA blocks.
Electronic ceramics are ceramic electronic components in the electronics and semiconductor industries. The main materials of electronic ceramics include aluminum oxide, aluminum nitride, silicon carbide, zirconium oxide, silicon nitride, etc. The precision and quality requirements for electronic ceramic structural components and functional ceramics are relatively high, and the sintering process of electronic ceramics is an important part of ensuring ceramic quality. Sintering electronic ceramics not only requires special kiln equipment, but also excellent isolation materials for assistance. High purity 99.8-99.9% white aluminum oxide powder F80-F220 are used as prelay sand in the ceramic green body sintering process.
Blasting media white aluminum oxide F120( White corundum 120 grit) is an artificial abrasive media. It can meet the requirements of high sandblasting efficiency, high durability, low residue, and corrosion resistance of coatings.
There are several advantage of Blasting media White aluminum oxide F120:
99.7%-99.8% WFA powder gets 97% corundum phase in crystal. The sodium oxide content is less than 0.1%. It works in fine refractory coatings, refractory castables, ceramic shell slurry, high-end grinding tools, coatings, and spray materials.
White corundum is an artificially synthesized wear-resistant material. The typically aluminum oxide content is 99% -99.5% with A grade white corundum. In more specialized fields, using low sodium industrial alumina powder and refining with special formulas can purify white corundum alumina to 99.7% -99.8%, with sodium content controlled within 0.1%. The proportion of corundum phase after crystallization is 97-98%. That greatly improves the fire resistance, wear resistance, self sharpening, bulk density and many other properties of white corundum. Then with suspension treatment and water seivinig, we get 99.8% white corundum powder. This type of aluminum oxide powder is micro sodium white corundum powder.
99.7%+ Aluminum oxide powder 800# fused is a type of low Na2O white fused alumina. The Na2O content is less than 0.1% with very low impurity. Due to strict control of the content of sodium oxide, the conversion rate of α – Al2O3 in the process of electrofusing aluminum oxide powder to form corundum crystals is higher than 90%. In terms of performance, it is reflected in better material hardness, fire resistance stability, and chemical stability.
As is well known, 99.5% white fused alumina is a type of WFA with low Na2O. The purpose of high-temperature melting through electric melting technology is to recrystallize industrial alumina powder and obtain a corundum crystal with high refractory temperature, high hardness, and strong grinding force. Most of the recrystallized alumina is in the corundum phase (i.e. alpha phase alumina). Normally, the Na2O content of white fused alumina is 0.3-0.4%. In the mean time, the content of alpha phase Al2O3 is about 90%. 99.5% white fused alumina produced through a special formula has a Na2O content of less than 0.1%. That helps to increase the production proportion of corundum phase. The proportion of alpha phase Al2O3 can reach 97-98%. This greatly improves the physical and thermodynamic properties of white fused alumina material.
After slicing silicon wafer, sandblasting treatment can remove the oxide layer and improve the flatness. The commonly used sandblasting method is wet micro-sandblasting. The blasting media for this application is white fused aluminum oxide 15-20um powder.
