采用西安科技大学王晓刚教授发明的多热源合成SiC技术，使用自行设计的实验装置，将SiC合成过程中产生的CO气体收集于物料外部，形成了物料和收集装置之间密闭的气体空间，并对气体空间内CO气体的温度、压强、流量、酸碱性、组分含量等参数进行了实验研究。一般地，影响CO气体温度、压强、流量等参数的控制因素主要有两个，一是和装炉体积大小相关的保温料层厚度，二是实验过程中的供电量和供电时间。研究了CO气体温度、温度梯度、压强、流量等参数随保温料层厚度和供电量两个主要控制因素的变化规律以及气体温度梯度随空间位置的变化规律。实验结果表明：SiC合成炉内的气体空间中，气体温度随供电时间的延长而升高，呈现出了近线性增长的变化规律；空间位置越高，距物料表面越远，气体温度就越低，气体温度梯度值就越小，在物料上部的气体空间内竖直方向上，就形成了与实验条件、空间位置相关的温度梯度值；保温料层的厚薄，是影响气体温度的主要因素，保温料层越厚，气体温度就越低。在整个实验过程中，气体的压强、流量均比较稳定，变化较小，压力约为5kPa，流量为6～12m3/h不等；使用pH广泛试纸测得气体的酸碱值约为6.5，气体呈弱酸性。采用QF型1904气体分析仪测得气体的主要成分为CO，含量为65～92%不等。 多热源SiC合成炉内气体温度、压强、流量等参数变化规律为气体收集装置材料的选择、研制提供了理论依据和技术参数，针对SiC合成炉内CO气体高温特性，首先从市场现有的材料中优先选择出合适的有机基材和高温涂料，通过实验研究自行配制出适合SiC合成炉内的CO气体温度、压强、流量等参数的收集材料，该材料具有柔韧性好、力学强度高、耐高温、耐酸碱腐蚀等优异性能。实验基材为涂塑布（二防布），表面涂覆的高温涂料为掺加有20%增柔剂邻苯二甲酸二丁酯、20%矿化剂Al2O3粉的400℃常温固化耐高温防腐涂料。将该新型涂料涂于涂塑布（二防布）的表面，待涂料表干后即可使用，并于SiC中试炉上进行了耐高温实验验证。实验结果表明：在炉内物料基本上已完全反应、保温料层的厚度值近似为0的条件下，距物料表面正上方约60cm处收集装置表面气体温度最大值高达300℃，该材料仍能继续工作，且保持有较好的力学性能。

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.