一、引言 近几年来,稀有金属的烧结和提纯,对真空电阻炉提出了愈来愈高的要求。将超高真空技术应用于冶金工业已成为急待解决的问题。例如,由于电子技术要向小型和微型化发展,对于钽、铌电容器的要求是体积小和比容高。而在钽、铌的烧结过程中有较高的真空度或者适当的降低烧结 I. INTRODUCTION In recent years, the sintering and purification of rare metals have raised higher and higher requirements for vacuum resistance furnaces. The ultra-high vacuum technology used in metallurgical industry has become an urgent problem to be solved. For example, niobium capacitors are required to be small in volume and high in specific volume for tantalum due to the miniaturization and development of electronic technology. In tantalum, niobium sintering process has a higher degree of vacuum or appropriate to reduce sintering