WO3 film, an n-type semiconductor, is used as an excellent thin film gas-sensing element in applications of gas sensors. You know, WO3 is a typical n-type gas sensing material that has attracted considerable attention to detect various hazardous gases, in the form of nano particles or thin films.

Tungsten alloy cluster bomb, which is also known as tungsten alloy cluster munition, is a container filled with small explosive bombs called “sub-munitions.” This container may be a shell, rocket, missile, or other device. Dropped from an aircraft or fired from the ground, it opens in the air and releases the tungsten alloy sub-munitions. This scatters a carpet of bombs over a large area without any degree of accuracy, to attack cluster targets such as cluster tanks, armored combat vehicles, military assembly sites, or large area targets such as airport runways.

As a gas sensing material, WO3 on the nanoscale has good gas sensitivity and selectivity towards H2, CO, H2S, NH3, NOx, O3 as well as some organic gases. WO3 nano powder is a typical n-type semiconductor that is considered to be the promising material to fabricate the gas sensor, which has a widespread utilization in the environment detecting and the safety monitoring. When WO3 nanopowder contacts the gas to be measured, its resistance changes, so that the output signal changes accordingly to achieve the purpose of gas detection.

Tungsten alloy applied for military defense is tungsten heavy alloy that is 90% to 97% pure tungsten in a matrix of nickel and copper, or nickel and iron. Why these alloying elements are necessary? That is because pure tungsten is very difficult to machine or fabricate, addition of these elements improves both the ductility and machinability of the alloys while retaining its high density. These tungsten heavy alloys are ideal for high density applications where machining is required. For example, tungsten alloy is widely used as the cores of armor-piercing projectiles, the shaped charge liners of shaped charges, the warheads of rockets and artillery shells, the rotors of missile gyroscopes, the projectiles of clusters, etc.