Download Free Niobium Molybdenum Tantalum And Tungsten Book in PDF and EPUB Free Download. You can read online Niobium Molybdenum Tantalum And Tungsten and write the review.

The metals Nb, Mo, Ta and W are discussed from the aspects of: (1) physical properties, (2) mechanical characteristics at various temperatures (unalloyed metal and main alloys), and (3) oxidation behaviour. Reference is also made to the problems of protective coatings, joining and fabrication. Following the examination of the present state of knowledge, recommendations are made for research and development. A detailed study is presented of the state of knowledge of each of the metals in regard to phase diagrams, impurities (determination and effects), diffusion couples, behaviour at high temperature under exposure to different gases, and protective coatings. A bibliography of the studies of the 4 metals and their alloys is also presented.
Many of the important developments in the joining of columbium, molybdenum, tantalum, tungsten, and graphite are summarized. Much of the subject matter is devoted to the brazing processes, but diffusion and solid-state bonding are covered also. The particular properties which recommend the refractory metals and graphite to aerospace applications are discussed. Adverse properties which limit the use of these materials or which must be overcome by using special precautions also are mentioned. Typical filler metals used to join the refractory materials for low- as well as high-temperature service conditions are covered. The information was gathered from the current literature on joining and from the open DMIC files.