FCVI中气体流量对温度分布的影响

强制流动热梯度化学气相渗透(FCVI)作为一种制备碳基与陶瓷基复合材料的新工艺 ,可在短时间内制备出密度均匀、性能优良的制件。分析了在FCVI工艺过程中预制体温度与气体温度的区别 ,并从理论上推导出了FCVI中气体温度与预制体温度间的关系 ,进一步分析气体流量对气体温度分布的影响。

RELATIONSHIP BETWEEN TEMPERATURE DISTRIBUTION AND FLOW QUANTITY OF GAS IN FCVI

As a new approach to the fabrication of carbon/carbon composites, forced flow thermal gradient chemical vapor infiltration(FCVI) process can overcome the problems of slow diffusion and restricted permeability, resulting in dramatically short densification time with uniform infiltration and good properties. This paper described the difference of temperature between gas and preform. On the basis of theoretic analysis, an equation was deduced to describe the relation of temperature between gas and preform. Moreover, the relation between the temperature distribution of gas and the flow quantity of gas was investigated according to the equation.