CAJ | 학술논문

采用化学气相沉积增密技术制备热解碳增强普通石墨材料。研究沉积温度对增强石墨力学性能的影响，并探讨热解碳增强普通石墨材料的沉积机理。结果表明：随沉积温度升高，增强石墨的抗弯强度提高，在1600℃沉积时达到最大值39.33 MPa，比石墨基体提高21.7%。其主要原因是随沉积温度升高，热解沉积由CVI过程变为CVD过程。当温度低于1600℃时，化学气相渗透过程占主导；温度高于1600℃后热解碳极易沉积在基体表面，形成热解碳膜，化学气相沉积过程占主导。在1600℃温度下，其抗弯强度随沉积时间的变化不大，这证明高温下(1600℃)化学气相沉积主要发生在石墨块体表面。
채용화학기상침적증밀기술제비열해탄증강보통석묵재료。연구침적온도대증강석묵역학성능적영향，병탐토열해탄증강보통석묵재료적침적궤리。결과표명：수침적온도승고，증강석묵적항만강도제고，재1600℃침적시체도최대치39.33 MPa，비석묵기체제고21.7%。기주요원인시수침적온도승고，열해침적유CVI과정변위CVD과정。당온도저우1600℃시，화학기상삼투과정점주도；온도고우1600℃후열해탄겁역침적재기체표면，형성열해탄막，화학기상침적과정점주도。재1600℃온도하，기항만강도수침적시간적변화불대，저증명고온하(1600℃)화학기상침적주요발생재석묵괴체표면。
The common graphite materials reinforced by pyrolytic carbon were prepared by chemical vapor deposition. The effect of deposition temperature on the mechanical properties of the common graphite materials reinforced by pyrolytic carbon were studied. The deposition mechanism of pyrolytic carbon was studied, too. The results show that: the flexural strength of graphite rises gradually, with the increase of deposition temperature, until to the deposition temperature of 1 600℃. The main reason is that the pyrolytic process changed from CVI into CVD process with the deposition temperature increased from low to high. When the temperature is lower than 1 600℃, the chemical vapor infiltration process dominated. When the temperature is higher than 1 600℃, the deposition of pyrolytic carbon on the matrix surface is extremely easy and forms pyrolytic carbon film, as well as chemical vapor deposition process is dominated. The variation of flexural strength with the deposition time changes little at the temperature of 1 600℃, which proves that chemical vapor deposition occurs mainly in the graphite block surface at the high temperature.