A thermal insulating layer of 99.5% White corundum sand can avoid the Alumina ceramic component sticking during sintering. The corundum sand here refers to Low soda white fused aluminum oxide particles. The WFA sand is chemical & heat insert. That is very important features for this application.
Starting from the end of September 2024, the price of Bayer process alumina powder has skyrocketed. That lead to the price rise of white fused alumina directly. Several listed companies producing alumina related products hit the daily limit up. There are many reasons for the price increase this time such as:
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.
