The dense sintered material has a uniform, fine-grained structure and possesses some small pores of 12 Lm. The matrix is ​​formed from sintered, well-defined particles. Porous materials belong to sintered honeycomb ceramics in terms of structure type. The pore surface is abnormally rough. The pore wall structure is consistent with the overall structure of the densely sintered material. Stoma walls are formed from well-integrated pellets. A two-layer refractory sample was made by separately preparing a densely sintered and porous layer and bonding the two with the same composition slurry. In the preparation of the porous layer, in addition to the conventional two-stage (separation) process with zirconium-containing ceramics, the synthesis and sintering were also successfully combined in the case of using zirconia powder and oblique zirconium oxide powder. In one process, the shrinkage is lower than in the two-stage process. Porous insulation material was prepared by incineration of zirconium oxide. This material can be used both in the form of a separate liner and in the form of a bi-laminate bonded to a dense sintered layer for use in a lanthanum chromite heater furnace.
Due to temperature changes in the furnace body to generate thermal stress, when the temperature changes rapidly, this thermal stress is enough to cause damage to the kiln liner, sometimes even affecting the steel structure of the kiln, which is why many furnace refractories in the far The main reason for cracking, spalling, and even collapse is below the allowable operating temperature. On the other hand, the service temperature of the refractory is also closely related to the load it is subjected to. From the refractory softening temperature test of the refractory material, it can be known that the greater the load tolerated by the refractory material, the lower its allowable operating temperature. It can be seen that the temperature stress has a direct impact on the service life of the refractory material. Therefore, researching the experience exchange of the arched furnace and choosing a reasonable structural form is of great significance for improving the service life of the arched furnace top.
Stainless Steel Welded Round Pipe
Stainless Steel Pipe is a kind of hollow long round steel, which is widely used in petroleum, chemical, medical, food, light industry, mechanical instruments and other industrial pipelines and mechanical structural parts. In addition, when the bending and torsion strength are the same, the weight is lighter, so it is also widely used in manufacturing mechanical parts and engineering structures. It is also used for furniture, kitchenware, etc. The hardness of stainless steel pipe is usually measured by Brinell, Rockwell and Vickers. Annealed stainless steel pipe with inner diameter of more than 6.0 mm and wall thickness of less than 13 mm. Production process of stainless steel seamless pipe A. round steel preparation; b. Heating; c. Hot rolling perforation; d. Cutting head; e. Pickling; f. Grinding; g. Lubrication; h. Cold rolling; i. Degreasing; j. Solution heat treatment; k. Straightening; l. Pipe cutting; m. Pickling; n. Finished product inspection. Common materials are 201, 304 and 316.ETC
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