Method of preparing tungsten metal material and tungsten target with high purity
Inactive Publication Date: 2018-01-25
NAT CHUNG SHAN INST SCI & TECH
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Benefits of technology
The present invention provides a method of preparing high purity tungsten metal material, which includes steps of mixing tungsten metal powder with metal nitrate, ball-grinding, and sintering. The resulting material has a purity of more than 99.% and a density of more than 99% of pure tungsten. It can be used to prepare tungsten metal targets with high purity and high density. The technical effect of this invention is to provide a reliable and efficient method for preparing high purity tungsten metal materials for various applications.
Problems solved by technology
However, continuous casting is not suitable for the metals with high melting point such as tungsten, molybdenum, and tantalum.
However, this method cannot be used for the metal materials with higher melting point or for achieving purity>99% (2N) such as tungsten, molybdenum, and tantalum.
Besides, the degree of vacuum will seriously influence the smelting purity.
However, though the purity of the raw material are high, the disadvantage of this method is that the cost of the manufacturing equipment is expensive.
Moreover, the grains of the metal obtained by electron beam smelting are rough and big which cannot be directly used as target and have to be further treated.
But, in the process of casting, there are some defects such as segregation of the ingredients, porosity, and non-uniform microstructure which appear after slow solidification.
But, all these costs of investment for the equipment are very expensive, and thus are not advantageous for the industry to carry out mass production.
Method used
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embodiment
[0022]The present embodiment mixes W(CO)6 (hexacarbonyl tungsten) with Ni(NO3)2 (metal nitrate) to form a mixed powder slurry, and illustrates the influence of different proportions of solid phase to liquid phase on the target (final product). The ingredients are shown in Table 1. According to Table 1, the present embodiment mixes W(CO)6 (hexacarbonyl tungsten) with Ni(NO3)2 (metal nitrate) by different proportions of solid phase to liquid phase to form a tungsten-based metal mixed slurry, which is further mixed with oleic acid (solvent) and YSZ grinding balls. After 24-hour ball grinding, the mixed slurry is put into the furnace at 200° C. After being completely dried to become powder, it is filtered through the 325 mesh screen to obtain uniformly mixed powder. The present embodiment further adopts dry pressing to press and shape the powder into green body of circular shaped disk (8 mm in diameter).
TABLE 1Different proportions of solid phase to liquid phaseProportion of solid phase...
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Abstract
A method of preparing a tungsten metal material with high purity, comprising the steps of (A) providing a tungsten metal powder to mix with a metal nitrate to form a mixed powder slurry; (B) ball-grinding the mixed powder slurry to obtain a uniformly mixed powder; (C) sintering the uniformly mixed powder to obtain the tungsten metal material with high purity. Accordingly, the tungsten metal material with purity more than 99.9% can be prepared, so as to prepare the tungsten metal target.
Description
CROSS-REFERENCE TO RELATED APPLICATION[0001]This non-provisional application claims priority under 35 U.S.C. §119(a) on Patent Application No(s). 105122815 filed in Taiwan, R.O.C. on Jul. 20, 2016, the entire contents of which are hereby incorporated by reference.FIELD OF THE INVENTION[0002]The present invention relates to a method of preparing the metal material and, more particularly, to a method of preparing the tungsten metal material with high purity and a method of preparing the tungsten target.BACKGROUND OF THE INVENTION[0003]Tungsten has the highest melting point among the metals. Since tungsten has the properties such as high strength, high density, good toughness of matrix phase, low coefficient of expansion, and good wear-resistant ability, tungsten is usually used in the fields of national defense and electronics industry. In the military industry, particularly in the aspect used for manufacturing weapons, tungsten exhibits good property. Tungsten is principally used in ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B22F9/30B22F9/04B22F1/00
CPCB22F9/30B22F1/0003B22F2998/10B22F2009/043B22F2301/20B22F9/04B22F3/1017B22F1/09B22F1/142B22F3/02B22F3/1035C22C1/1084C22C1/05
InventorLIN, CHIA-SHIHWEI, CHAO-NANNIEH, CUO-YOBOR, HUI-YUNFUNG, KUAN-ZONG
OwnerNAT CHUNG SHAN INST SCI & TECH