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含有弥散碳化物的化学汽相沉积钨被选来用于航天飞机轨道机动系统和反应控制系统的单向活门菌状物和活门座的材料。这一选择是按照美国国家航宇局提出的原型单向活门研制计划做出的,它采用刀刃式密封壳体茵状物结构方案。菌状物材料沉积成一层厚度约0.9毫米(0.035叶)的沉积层,而后作为独立体被加工成壳体。活门座材料沉积在活门座坯上约1.1毫米(0.045叶)厚以后,在沉积层上加工成刀刃式密封件。模件试验证明,该材料可以研磨或抛光成很锐利的刀刃形,并能切断典型的系统污染,在一定的范围内,密封面不会有太大的破坏。同时还确定了这种材料不受强氧化可贮推进剂的影响。
Chemically vapor-deposited tungsten with dispersed carbides was selected for use as materials for one-way valve cells and valve seats of the Shuttle Orbital Motor System and Reaction Control System. This option was based on a prototype unidirectional valve development program proposed by the National Aeronautics and Space Administration that employs a knife-edge, hermetically sealed housing-like structure. The bacterial material is deposited as a deposit of about 0.9 mm (0.035 folds) thick and then processed into a shell as a separate body. After the valve seat material is deposited on the valve seat blank about 1.1 mm (0.045 leaf) thick, it is processed into a knife-edge seal on the deposit. Modular tests have shown that the material can be ground or polished to a sharp knife-edge shape and cut off typical system contamination, and within a certain range, the sealing surface will not be much damaged. It has also been determined that this material is not strongly oxidized to propel the propellant.