论文部分内容阅读
由于各种新兴的科学技术部门如超音速飞机、火箭、导弹、核子动力工程的发展,因而就相应地需要一些在高溫下有一定机械强度、能忍受溫度急剧变化、有较高热导率而又能耐腐蚀的材料。例如,一个速度为+倍声速的导弹,几秒钟內表面溫度达415℃。火箭发动机工作时,在几个微秒內溫度达到1670—5000℃和100大气压。难熔金属钨、钼、鉻、铌、钽等和氧化物-
Due to the development of various emerging science and technology sectors such as supersonic aircraft, rockets, missiles and nuclear power engineering, accordingly, there is a need for some mechanical strength at high temperatures, capable of withstanding rapid changes in temperature and high thermal conductivity Corrosion-resistant material. For example, a missile with a velocity of + times the speed of sound will have a surface temperature of 415 ° C in a few seconds. Rocket engine work, in a few microseconds temperature reached 1670-5000 ℃ and 100 atm. Refractory metals such as tungsten, molybdenum, chromium, niobium, tantalum, and oxide-