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Preparation method of nano yttrium oxide dispersion strengthening tungsten alloy

A technology of nano-yttrium oxide and dispersion strengthening, which is applied in the field of powder manufacturing, can solve the problems of grain boundary segregation, large dispersed phase of tungsten alloy grains, uneven mixing of yttrium oxide, etc., and achieve high hardness and high density.

Inactive Publication Date: 2013-06-26
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method has fewer steps, it is prone to uneven mixing of yttrium oxide in tungsten
And the added nano-scale yttrium oxide powder is easy to agglomerate, resulting in the problem that the dispersed phase existing in the tungsten alloy grains is too large and segregated at the grain boundary

Method used

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  • Preparation method of nano yttrium oxide dispersion strengthening tungsten alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In the process of preparing sintered tungsten alloy with nanometer Y2O3 content of 0.05%, the specific preparation process is as follows:

[0020] Step 1. Dissolve 1.42g of yttrium nitrate in 100ml of alcohol, ball mill and mix with 270g of ammonium paratungstate. The mass ratio of yttrium nitrate to ammonium paratungstate is 1:1000. The mixing process is that the ball milling speed is 120r / min, and the ball milling time is 2 hours ;

[0021] Step 2. Put the mixed wet powder into a vacuum drying oven, dry at 50°C, and dry for 20 hours;

[0022] Step 3: put the dried raw material powder into a muffle furnace for calcination, the calcination temperature is 700°C, and the calcination time is 1 hour, to obtain nano-yttrium oxide dispersion-strengthened tungsten oxide powder;

[0023] Step 4: Prepare nano-yttrium oxide dispersion-strengthened tungsten powder by subjecting the nano-yttrium oxide dispersion-strengthened tungsten oxide powder to hydrogen reduction at 900°C for...

Embodiment 2

[0027] Preparation of sintered tungsten alloy with nanometer Y2O3 content of 2.5% In this implementation process, the specific preparation process is:

[0028] Step 1. Dissolve 19.15g of yttrium nitrate in 150ml of alcohol, and ball mill and mix it with 270g of ammonium paratungstate. The mass ratio of yttrium nitrate and ammonium paratungstate is 1:40. The mixing process is that the ball milling speed is 150r / min, and the ball milling time is 8 hours ;

[0029] Step 2. Put the mixed wet powder into a vacuum drying oven, and dry at 65°C for 12 hours;

[0030] Step 3, put the dried raw material powder into a muffle furnace for calcination, the calcination temperature is 500°C, and the calcination time is 3 hours, to obtain nano-yttrium oxide dispersion-strengthened tungsten oxide powder;

[0031] Step 4. The nano-yttrium oxide dispersion-strengthened tungsten oxide powder is subjected to hydrogen reduction at 700°C for 60 minutes to prepare nano-yttrium oxide dispersion-streng...

Embodiment 3

[0035] Preparation of sintered tungsten alloy with nanometer Y2O3 content of 5% In this implementation process, the specific preparation process is:

[0036] Step 1. Dissolve 38.3g of yttrium nitrate in 500ml of alcohol, and mix it with 270g of ammonium paratungstate by ball milling. The mixing process is that the ball milling speed is 150r / min, the mass ratio of yttrium nitrate to ammonium paratungstate is 1:20, and the ball milling time is 12 hours ;

[0037] Step 2. Put the mixed wet powder into a vacuum drying oven and dry at 75°C for 36 hours;

[0038] Step 3: putting the dried raw material powder into a muffle furnace for calcination at a calcination temperature of 900° C. and a calcination time of 1 hour to obtain nano-yttrium oxide dispersion-strengthened tungsten oxide powder.

[0039] Step 4: The nano-yttrium oxide dispersion-strengthened tungsten oxide powder is subjected to hydrogen reduction at 1000° C. for 30 minutes to prepare the nano-yttrium oxide dispersion-...

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Abstract

The invention provides a preparation method of a nano yttrium oxide dispersion strengthening tungsten alloy and belongs to the field of the manufacturing of powder used for powder metallurgy. The preparation method mainly comprises the following steps of: dissolving yttrium nitrite (Y(NO3)3.6H2O) in ethyl alcohol, and carrying out ball milling and mixing on yttrium nitrite and ammonium paratungstate (APT); after wet powder is dried by distillation, calcining for 20-150 minutes at the temperature of 400-900 DEG C to obtain nano yttrium oxide dispersion strengthening tungsten powder; then reducing by H2 for 30-150 minutes at the temperature of 600-1000 DEG C to prepare the nano yttrium oxide dispersion strengthening tungsten powder; and mixing 0.1-1% of Ni as an activated sintering agent, and carrying out compression moulding and H2 gas shield sintering or vacuum or HIP (hot isostatic pressing) sintering, so that the nano yttrium oxide dispersion strengthening tungsten alloy can be prepared. The preparation method provided by the invention has the advantages that the density can be 18.28-19.2g / cm<3>, and a yttrium oxide dispersed phase is fine and is uniformly distributed in tungsten crystal particles.

Description

technical field [0001] The invention belongs to the field of powder manufacturing in powder metallurgy production technology, and relates to a preparation method of nanometer yttrium oxide dispersion strengthened tungsten alloy. Background technique [0002] Tungsten has a high density (19.3 g / cm3), the highest strength among refractory metals, high elastic modulus, small expansion coefficient, low vapor pressure, excellent corrosion resistance, excellent thermal shock resistance and neutron radiation resistance Tungsten and its alloys are also widely used in the electronics and electric light source industries, as well as in aerospace, casting, weapons and other departments. Make rocket nozzles, die-casting molds, armor-piercing projectile cores, contacts, heating elements and heat shields, etc. In the aerospace industry, tungsten and its alloys can be used to make rocket nozzles without cooling, ion rings of ion rocket engines, jet vanes and positioning rings, hot gas ref...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C27/04B22F9/22
Inventor 郭志猛王瑞欣罗骥杨芳
Owner UNIV OF SCI & TECH BEIJING
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