Preparation method of high purity and densified tungsten-titanium metal

Patent metadata

Field	Value
Publication number	US-10906099-B2
Application number	US-201816104151-A
Country	US
Kind code	B2
Filing date	Aug 17, 2018
Priority date	Dec 26, 2017
Publication date	Feb 2, 2021
Grant date	Feb 2, 2021

Abstract

A preparation method of high purity and densified tungsten-titanium metal which mixes titanium metal powder and tungsten metal powder together; adds metallic nitrates (such as nickel nitrate) as combustion improvers; then taking into the account of the characteristics of metal nitrate, which is soluble in alcohols to form a liquidous precursor, adds metal powder to mix together thoroughly, so that the sintering agent is expected to be colloid and uniformly spread among the tungsten-titanium metal powder. The preparation method significantly reduces the ratio of the combustion improver during the preparation of the high purity and densified tungsten-titanium target material.

First claim

What is claimed is:

1. A preparation method of high purity and densified tungsten-titanium metal which includes the following steps of:
(1) mixing a tungsten-titanium metal powder with a nickel nitrate and/or iron nitrate powder to form a powder mixture;
(2) mixing the powder mixture with a solvent to form a powder mixture slurry;
(3) applying a ball mill process to the powder mixture slurry to produce a uniform slurry mixture;
(4) baking, heating and screening the uniform slurry mixture to form a uniform powder mixture;
(5) pressing the uniform powder mixture into a circular molded body which is sintered by a high-temperature heat treatment to form a tungsten-titanium metal target, where the tungsten-titanium metal target is made of tungsten-titanium metal with a relative density >99% and a purity level of >99%, and wherein the nickel nitrate and/or iron nitrate accounts for 0.4% in volume of the powder mixture.

2. The preparation method of high purity and densified tungsten-titanium metal as claimed in claim 1 , wherein the solvent is an organic solvent.

3. The preparation method of high purity and densified tungsten-titanium metal as claimed in claim 2 , wherein the solvent is ethanol.

4. The preparation method of high purity and densified tungsten-titanium metal as claimed in claim 1 , wherein a heating temperature in Step 4 is at least 200° C. or higher.

5. The preparation method of high purity and densified tungsten-titanium metal as claimed in claim 1 , wherein a sintering temperature of the high-temperature heat treatment in Step 5 is at least 1200° C. or higher.

6. The preparation method of high purity and densified tungsten-titanium metal as claimed in claim 1 , wherein a screen used in the screening in Step 4 is a 320-mesh screen.

7. The preparation method of high purity and densified tungsten-titanium metal as claimed in claim 1 , wherein the tungsten-titanium metal target is made of tungsten-titanium metal with a grain size of 1 to 3 micrometers, nickel content not greater than 230 ppm, and carbon content not greater than 40 ppm.

Assignees

• Nat Chung Shan Inst Science & Tech

Inventors

• Chiou Mau-Sheng
• Liao Chien-Hung
• Wei Chao-Nan
• Bor Hui-Yun
• Fung Kuan-Zong

Classifications

• B22F1/105

  containing inorganic lubricating or binding agents, e.g. metal salts · CPC title

• B22F1/107

  containing organic material comprising solvents, e.g. for slip casting · CPC title

• B22F1/05

  Metallic powder characterised by the size or surface area of the particles · CPC title

• C22C1/045

  Alloys based on refractory metals · CPC title

• C23C16/00

  Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes (reactive sputtering or vacuum evaporation C23C14/00) · CPC title