Sintering wolfram boat is to firing anhydrous wolframic acid to produce tungsten powder, which is an important carrier for making it. Or loading ammonium paratungstate (APT) in firing W-boat to make wolfram powder, the APT is white crystal, which include schistose and acicular, it is applied in the manufacturing process of tungsten metal powder by anhydrous wolframic acid or blue tungsten oxide.

Sintering tungsten boat is mainly used in the production of tungsten powder. Burning ammonium paratungstate into yellow tungsten oxide or blue tungsten oxide, and then make wolfram powder in hydrogen. During the manufacturing process, tungsten oxide should be placed in a W-boat and then put in the reduction furnace. After recycling the hydrogen, remove the carrier. Fritting is divided into three stages, namely the low temperature burn-in step, the medium temperature firing step and keeping warm in a high temperature. In the low-temperature burn-in step is mainly to volatilize the gas and moisture content which is adsorbed in wolfram boat. Anhydrous wolframic acid is a raw material of wolfram powder.

Process for preparing tungsten powder can be divided into two stages. The first procedure is that the  anhydrous wolframic acid is reduced to tungsten dioxide at a temperature of 500 ℃ -700 ℃. The second procedure is that tungsten dioxide is reverted to the wolfram powder under the temperature of 700 ℃ -900 ℃. Purity, particle size, size distribution and other properties of the reduction of W-powder, which primarily rely on the reduction process. When you restore a wolfram powder in a tube furnace, temperature of reduction, charging capacity of tungsten oxide of W-boat, moving speed of W-boat, the flow rate of hydrogen and moisture content of hydrogen content are the main factors to influence the speed of reduction. Particle size of wolfram powder will become thicken as the temperature rises.

While firing, sintering tungsten boat can remove a portion of the harmful impurities, such as sulfur, potassium, sodium and others. This type of W-boat reduces the adverse effects of harmful ingredients (water, oxygen, nitrogen) of the product under vacuum fritting. It is in favor of eliminating the adsorbed gas and the residual gas of the pores which can promote post- fritting shrinkage. However, due to the high temperature, fritting stove would emit large amounts of waste heat.

With the development and application of nuclear technology, radiation technology shows great potential in the medical, radiation processing, power generation, food security, industrial testing and other aspects. Radiation technology is a subject that is closely linked to the fields of high polymer materials, environmental science, biotechnology and medicine. It main uses radiation (such as gamma rays, X-rays, neutrons, etc.) emitted by radiation source to interact with matter to produce activated atoms and activated molecules which will react with matter both in both in physically and chemically, thereby improving the quality and performance of materials or leading to the degradation, polymerization and crosslinking modification of substances and preparation of new substances. The characteristics of radiation technology include high added value, low energy consumption and wide application, radiation technology is widely used in the modification of semiconductor and polymer, food preservation, and radiation sterilization of medical supplies and the like. Radiation technology can be categorized as radiation crosslinking, radiation curing, radiation vulcanization, radiation degradation, radiation grafted.

Radiation technology has brought radiological hazards while bringing the great facility to people. The largest long-term health risk of radiation is cancer. Radiation can destroy the mechanism in vivo which can prevent cancer, so that greatly increases the risk of cancer. Radiation can also enter the body through a variety of ways, causing internal radiation damage, leading to fatigue, dizziness, insomnia, skin redness, ulceration, bleeding, hair loss, leukemia, vomiting, diarrhea and other symptoms. In addition, radiation will increase aberration rate and hereditary disease incidence, to affect the health of future generations. Exposure to radiation will lead to genetic changes, once the DNA in reproductive cells are damaged, the new generation will inherit the altered gene of mother, thus increasing the risks of defects in the offspring. It is understood that the fetal embryos and fetuses are more sensitive to radiation, exposure to radiation before embryo implantation can increase the late fetal mortality rate; while in the case of exposure to radiation during organogenesis, the increased rates are elevated rate of fetal malformations and neonatal mortality.

Tungsten alloy shielding is widely used to absorb and shield radiation generated by the use of radiation technology. Experts have found that the radiation shielding capability of a material is closely related to its density, higher density means better shielding capability to shield and absorb the radiation. Since the tungsten alloy has a higher density compared with other radiation shielding materials (such as lead), tungsten alloy shielding exhibits better radiation shielding capability. Tungsten alloy shielding has high density also means that under the same shielding ability, tungsten alloy shielding is smaller and thinner.