Preparation And Properties Of Lioght Weight Refractory Used In Radiant Cooker And Fireplace

Recently, Radiant Cooker and Gas fireplace occupied the mainland of sales market inEuropean and American began to preheat the Chinese market. The number of enterprisesmanufactured them comes from each district of China is growing,in addition,the localagents who prefer to do similar business noticed the opportunities of selling Radiant Cookerand Gas fireplace and began to take their action.This subject is based on Radiant Cooker and Gas fireplace market, involving materialresearch and preparation of two different kinds of stoves. One of them named light-weightheat insulation composite materials which can be used in Radiant Cooker,while the othercalled light-weight refractory used in Gas fireplace.In this paper, a design idea of compositing different materials was adopted to prepare alight-weight heat insulation composite material,which composed of ceramic fiber andinorganic powder cohered by complex binder. The novel point showed in this techniquereflected by taking advantage of fly ash and siliceous dust during the preparation. Meanwhile,the products don't need to be calcined which can also save energy and simplify the moldingtechniques.Through repeated testing, the maximum dispersion concentration of inorganic fibersslurry and its added dispersant suitable range was determined. The results showed that themaximum dispersion concentration of fiber was appropriate 0.04g/ml, and the fiber slurryachieved good dispersion when the added amount of dispersant amounted to it's 0.3% -0.6%.In this experiment, the mold was self-made to shape up materials, and orthogonal tableL9(34)was designed to determine the test formulations. Scanning electron microscopy(SEM) was used to analyze the microstructure of composite insulation materials, and thesample thermal shock resistance, resistivity, and the apparent density were also measured.The results show that the composite insulation material has excellent thermal shock resistanceof hot and cold cycles without cracking,discoloring and powdering through 20 cycling.And the room temperature surface resistance of Furnace plate base material reached to500MΩ, higher than the national standard of 2MΩfor electrical insulating materials. Thematerial also had a apparent density of 0.6g/cm3, while the surface was flexible to fit electricwires. These results show that the composite insulation material overcomes the shortcomingsof traditional lightweight materials which were not quite commonly used in the Radiantcooker. Aiming at the refractory for gas fireplace, it had been improved based on industrialproducts. Experimental formula designed to take into account the cost of the product andperformance, process operability and customer demand and other factors. This test uses themethod which cement-sodium silicate as the additive composite with mixed fiber to suppressthe emergence of the "frost" phenomenon in the subsequent product processing, whileimproving product strength. The results show that frost is the main component of sodiumcarbonate and its hydration products. Adding the product of 5% cement and 2% silicone waterrepellent, the products of frost phenomena play an effective inhibition, and the 28d flexuralstrength can reach 3.2MPa, to meet customer needs.