However, plastic bolts cannot be used in high temperature environments. Yes, at the beginning of the design, the bolt selection of material is plastic, so the bolt not only weight to light, and high temperature strength can not be reduced. To this end, a kind of powder metallurgy titanium hollow screw with hexagonal head and circular through hole in the rest is designed and manufactured. Such hollow bolt is made by cold isostatic pressing and sintering after finishing the outside diameter of the lathe and machining thread. The dome of the sidewinder missile used to be made of titanium alloy blank with a mass of 2.2kg, and the finished dome with a precision tolerance and a wall thickness of 0.635mm was made by cutting. The quality of preformed billet produced by powder metallurgy cold isostatic pressing and sintering process is only 0.56kg, so the cost of only preforming billet is 60% less than that of forging rolled titanium alloy billet used before. At the same time, it also saves a lot of cutting costs and energy, which is obvious.
Maverick missile lens mount made of titanium powder metallurgy material. This part used to be made from blank, with cutting process, and the ratio of the quality of the feed to the quality of the finished part is 15:1; After the titanium powder metallurgy material is used for manufacturing, the ratio between the quality of the feed and the quality of the finished parts is reduced to 3:1, saving about 80% of the material, and of course, the cutting cost and energy consumption will be greatly reduced. Some powder metallurgy titanium alloy parts are produced by powder forging process. When using the conventional forging process to manufacture parts, not only the weight of the forgings is large, but also several pairs of forging moulds need to be used. When using the powder forging, the first use of cold isostatic pressing (or conventional pressing forming) process, the element powder mixed powder (or pre-alloyed titanium alloy powder) and sintering into preformed billet (density about 95%), and then after a forging, can be made into full-density forgings.
Aircraft titanium keel joints are made of titanium powder by hot isostatic pressing. When powder metallurgy isostatic pressing is used for manufacturing, each part can save 1.65KG of titanium alloy, about 78.6% of material, in addition to save a lot of cutting costs and time resources.
Industrial blunt titanium hexagon nuts produced by powder metallurgy can save a lot of costs in the process of manufacturing fasteners. This powder metallurgy titanium nuts account for the majority of titanium hexagon nuts market and have been used in military industry.
According to the literature. Titanium has excellent corrosion resistance to seawater and is an ideal material for naval weapons. Titanium powder unmetallurgic samples were tested in seawater at wrightsville beach and in Marine atmosphere at KureBeach, NorthCarolina. After 15 years of exposure to seawater, titanium POWDER metallurgy test plates showed excellent corrosion resistance.
Us Navy sonar reflector plate made of titanium alloy. This product was previously made from forging rolled titanium alloy with cutting process, as early as the 1970s, the production of powder metallurgy titanium alloy was switched.
Another project completed by the U.S. Navy is a method for extruding powder metallurgy titanium billet into 20mm shell casings. This was due to exposure to the elements to the ammunition stored in the rails on the deck to be fired, which quickly corroded. The initial production process consists of 7 processes, and the powder metallurgy titanium shell case is produced, and the test shooting is completed successfully. Later, due to the use of plastic and brass coated shells, the powder metallurgy titanium shell case was not used.
Such as missile nose cone, also used to be forged rolled titanium alloy ring material, made by cutting, as early as in the 1970s to use cold isostatic pressing sintering production. Early production of hundreds of powder metallurgy titanium alloy missile nose cones passed acceptance tests. Another special use of titanium powder is as a material in the production of incendiary bombs. Historically, zirconium and cerium alloys have been used for these purposes. However, titanium has some advantages as a material for the production of incendiary bombs, such as producing more energy per kilogram or cubic meter at a lower cost.
Post time: Aug-13-2021