The basic principle of SHS method for preparing refractories. Refractory materials prepared by SHS technology are based on the SHS reaction (mainly aluminothermic reaction) with a reduction stage. The aluminothermic reaction is an oxidation-reduction process. It is usually a large amount of heat released after ignition and the reaction is self-sustaining. The energy efficiency of the aluminum thermal reaction is high, making it possible to use it in the preparation of refractory materials and ceramics. The use of SHS technology to prepare refractories must consider whether the reaction mixture involved in the SHS reaction is readily available, whether the cost of the reaction mixture and the melting point of the reaction product satisfy the requirements of the refractories.
The SHS technology involved in the preparation of refractory materials is based on the SHS reaction with a reduction stage. The raw material composition is as follows: Raw material composition Heating material heating agent, such as Al, Mg and its alloy oxygen donor, such as Cr2O3, Fe2O3 and oxygen in the air. Aggregate additives such as CaF2, SiO2, etc. In the raw material composition of the material, in addition to aggregates and heat-generating materials involved in the SHS reaction, other substances are called additives. The role of additives is to improve the combustion characteristics, adjust the structure and composition of the product phase during the synthesis of the material. Different types of additives play different roles in the SHS reaction process.
The main additives used for SHS refractories are: various high-melting point oxides (such as SiO2, MgO, Al2O3, etc.), magnesite, dolomite, chromite, refractories, scrap, carbon-containing components and carbides and alkalis Metal and alkaline earth metal salts, metal nitrides, etc. The self-propagating reaction with reduction stage used in SHS refractories is aluminothermic reaction. The term "aluminothermic reaction" was first coined by Goldschmidt in 1908 to describe the highly exothermic redox reaction between aluminum and metal oxides.
By combining nice groove and the elegance of high-definition decorative panels, you will enjoy the ultimate in security and beatuy with the clean design popular Word antique finsh Interior moulded door. .8);">High-definition panels closely replicate the appearance of a high-end Wood Door with excellent shadow lines for added architectural interest. Expertly engineered, the wood-edge design features an energy saving door core adding strength and insulation. Ready to customize and paint, the baked-on primer helps create a durable, smooth finish.
Interior Door, Indoor Door, Inside Door, Internal Door.
Zhejiang JiHengKang (JHK) Door Industry Co.,LTD , http://www.zjjhk.com