Study On The Parameters And Collecting Devices Of CO Gas Produced From Multi-heat Sources SiC Furnace

Self-designing experimental devices are used by multi-heat sources SiC synthesizing technology invented by professor Wang xiaogang of Xi'an University of Science and Technology. CO gas is collecting outside reaction materials which is produced during SiC synthesis. Then the airtight gas room is formed between reaction materials and the collecting devices. The temperature, pressure, flux, ingredients and content of CO in the airtight gas room are studied through experiment. Commonly, there are two dominating controlling factors which influence the temperature, pressure, flux etc. of CO. One is the depth of heat preservation materials which correlating with the size and volume of furnace body. The other is the quantity and time of power supply during experiment. The changing rules of CO temperature, temperature grads, pressure, flux, etc. are studied following the two controlling factors of heat preservation material's depth and power supply quantity and the changing rules of temperature grads are studied following space. The experimental result shows that the temperature of CO gas increases along with the power supply time and takes on approximately linear increasing trend. Taller space and further from material surface, lower CO temperature, lower temperature grads. In upright direction of the gas field above material there is a certain temperature grads correlating with experimental conditions. The depth of heat preservation material is the dominant factor which influences CO temperature. Thicker heat preservation material, lower gas temperature. During the whole experiment, the pressure, flux of gas all are comparatively steady. They change less. The pressure approximately is 5kPa, the flux is 6～12m3/h. The acid-alkali value of gas approximately 6.5 by pH test paper. The gas takes on weakly acidic. The dominant component of gas is CO which's content is 65～92% by QF-1904 gas analyzing instrument. The temperature, pressure, flux, etc. parameter of gas produced from multi-heat sources SiC furnace offer theory basis. Aim at high temperature characteristic of CO in SiC furnace, the proper organic backing material and high-temperature coatings are chosen preferentially from existing materials in market. The collecting devices material is confected by experimental research. This material has excellent flexility, mechanics intensity, high-temperature, acid-alkali antisepsis and so on. The experiment backing material is plastic-coating fabric (di-defending fabric). The high-temperature coatings is 400℃ normal temperature solidifying high-temperature antisepsis coatings with 20% flexility-enhancing reagent dibutyl phthalate and 20% mineralizing reagent Al2O3. Coat this new composite on the surface of plastic-coating fabric (di-defending fabric), and after the new composite surface dries, it can be used. The validation has been done on SiC mid-experiment furnace. The experimental results show that the maximal surface temperature of collecting devices is up to 300℃ which is apart from material surface 60㎝, and the material reacts entirely, the depth of heat-preservation material is approximately 0㎝. In this condition the collecting devices still go on working and retain preferable mechanics performance.