The melting temperature of any high-quality glass including alkali-free or low-alkali is much lower than 1720e. Therefore, the dense Cr2O3 material may not react with the glass main component SiO2 during use, resulting in defects such as streaked stones in glass products. High-purity industrial Cr2O3 is used as raw material, isostatic pressing is adopted, compound additive is introduced, and it is fired in a weak reducing atmosphere, and the apparent porosity is 40%, the bulk density is 4.604.72gcm-3, the compressive strength is 318374MPa, and the glass is resistant to glass. Dense Cr2O3 products with excellent aggressiveness and permeability. The mechanism of the composite additive is that it forms a substitutional solid solution with Cr2O3 in the sintering process, activates the Cr2O3 crystal lattice, accelerates the Cr2O3's own body diffusion and surface diffusion rate, strengthens the grain-to-grain binding, and suppresses the grain growth of the main crystalline phase. As for the oxidation barrier effect of Cr2O3, it can be sintered at a lower temperature in a weak oxidizing atmosphere to obtain high-density, high-strength products. In the early 1990s, China began to research and produce B-Sialon/Si3N4 bonded SiC refractories, which has been used in the lower part of the blast furnace shaft and has achieved good results. So far, based on the severe synthetic process conditions of B-Sialon materials and the limitation of high temperature (>1m3) nitriding furnace temperature (generally no more than 1500e), it has not been possible to use industrial refractory materials and equipment for stable and reliable performance. - Sialon phase, making the production and application technology of fire-resistant Sialon material has not been widely developed. In this study, B-Sialon phase was synthesized by refractory raw materials and industrial conditions of not more than 1500e, which achieved a breakthrough in technology and technology, and provided important technical support for the research and development of B-Sialon-Al2O3-SiC high-grade refractories. From the backscattered electron image, it can be seen that each sample is a Sialon sintered body, and the energy spectrum microdomain analysis is composed of a Sialon phase.
Chisels are classified in different shapes according to different uses:
Flat chisel: the cutting edge is flat, the cutting edge and the chisel body is an inverted isosceles triangle, mainly used for opening square holes or repairing some square holes;
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Oblique chisel: the blade is 45° Angle, the blade and chisel body is an inverted right triangle, mainly used for repair, most of the dead corners for carving and carving repair;
Gouge: the cutting edge is semicircular, mainly used for opening circular or elliptical holes;
U type chisel: the cutting edge is U-shaped, which is rare now, mainly used for carving and repair;