Effect On The Function Of Deflection-Magnetic-Core Burning Frame Of Adding The Andalusite And Kaynite To Corundum-Mullite

As the rapid development of deflection magnetic core, much higher requirements are made on the function of the burning frame which is the best material of the kiln furniture for producing deflection magnetic core. But in our country, the research on this burning frame is a little bit late and what's more, no advanced one has been produced so far.Fine mechanics and resistance heat impact performances are needed for the well-functioned kiln furniture. While the kiln furniture of pure mullite has good refractoriness, thermal shock resistance, softening point under load, chemical corrosion resistance, creep properties resistance, volume stability and so on, its low intensity , especially its lower toughness, preventing it from the widely application in the kiln furniture. And on the other hand, the kiln furniture of pure corundum has high fusion, degree of hardness, chemical shock resistance, corrosive resistance, mechanics behavior in higher temperature etc., but its burning temperature is too high and its thermal shock resistance is not so good, so it is also not the suitable material for the kiln furniture. But Corundum-mullite multiphase ceramic is featured with high melting point and thermal shock resistance, fine creep properties resistance and oxidation resistance, abundance and low prices, as a result, it is wildly used in the kiln furniture. Since the late start of the research, the burning frame of corundum-mullite that produced by our country, compared with the foreign products of the same kind, has too much differences in quality. The burning frame produced in our country, to a large extent, can be used almost 40 times, but in Korea, it can be used over 100 times. Then the huge differences can be found in quality. So the pressing issue right now, is to make a change on the current production situation of the burning frame, improving its quality and lowing its cost.This paper makes detailed comparisons about the advantages and shortcomings of the different materials for the kiln furniture, adopting corundum-mullite finally. The subject mainly makes a research on the performance of the fire-proof material of corundum-mullite as adding andalusite and kaynite of different particle size to it. The result is got as follows. When the particle size of andalusite is less than 0.5mm and its content is 15 percent in the corundum-mullite, the biggest ambient compressive strength can be got by the test sample in the normal temperature, as far as 45.70MPa. Compared with the content of 10 percent and 20 percent, the the ambient compressive strength increases 6.9 percent and 22.4 percent respectively. Under the circumstances of the same composition of the pellet, as the increase of the powdered kaynite( less than 0.088mm), the ambient compressive strength of the test sample decreases gradually while the line change percentage increases. While keeping the same content, the ambient compressive strength of powdered andalusite(less than 0.088mm) is larger than powdered kaynite( less than 0.088mm). what's more, as the increase of the content, the difference of the ambient compressive strength on these two materials is more and more clear.