Aguilar Juan, Urueta Luis, Valdez Zarel
Universidad Autónoma de Nuevo León, Facultad de Ingeniería Mecánica y Eléctrica, Nuevo Leon, Mexico.
J Microw Power Electromagn Energy. 2007;40(3):145-54. doi: 10.1080/08327823.2005.11688536.
The aim of this work is conducting polymeric synthesis with microwaves for producing beta-SiC. A polymeric precursor was prepared by means of hydrolysis and condensation reactions from pheniltrimethoxysilane, water, methanol, ammonium hydroxide and chloride acid. The precursor was placed into a quartz tube in vacuum; pyrolysis was carried out conventionally in a tube furnace, and by microwaves at 2.45 GHz in a multimode cavity. Conventional tests took place in a scheme where temperature was up to 1500 degrees C for 120 minutes. Microwave heating rate was not controlled and tests lasted 60 and 90 minutes, temperature was around 900 degrees C. Products of the pyrolysis were analyzed by means of x-ray diffraction; in the microwave case the diffraction patterns showed a strong background of either very fine particles or amorphous material, then infrared spectroscopy was also employed for confirming carbon bonds. In both processes beta-SiC was found as the only produced carbide.
这项工作的目的是利用微波进行聚合物合成以制备β-SiC。通过苯基三甲氧基硅烷、水、甲醇、氢氧化铵和盐酸的水解和缩合反应制备了一种聚合物前驱体。将前驱体置于真空中的石英管中；传统上在管式炉中进行热解，并在多模腔中以2.45 GHz的微波进行热解。传统测试按照温度高达1500摄氏度并持续120分钟的方案进行。微波加热速率未控制，测试持续60和90分钟，温度约为900摄氏度。通过X射线衍射对热解产物进行分析；在微波情况下，衍射图谱显示出由非常细的颗粒或无定形材料构成的强烈背景，然后还采用红外光谱法来确认碳键。在这两个过程中，均发现β-SiC是唯一产生的碳化物。
