Method for preparing solid solution toughened wolfram-base composite material through laser rapid forming

A technology of laser rapid prototyping and composite materials, applied in the direction of improving process efficiency, improving energy efficiency, etc., can solve the problems of low temperature performance and grain growth of W and its alloys, and achieve the improvement of microstructure and comprehensive properties. Effect

Inactive Publication Date: 2013-05-01
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the thermal processing of W and its alloys, the grains will be exposed to high temperature environment for a long time, causing the grains of

Method used

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  • Method for preparing solid solution toughened wolfram-base composite material through laser rapid forming
  • Method for preparing solid solution toughened wolfram-base composite material through laser rapid forming
  • Method for preparing solid solution toughened wolfram-base composite material through laser rapid forming

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1: The mixed powder is composed of TiC powder with a purity of more than 99.8% and an average particle size of 50-70 nm and W powder with a purity of more than 99.9% and an average particle size of 4.5-5.5 μm, of which the TiC powder component accounts for the total content of 1wt.%, and put it in the German Fristsch company Pulverisette 6 single-pot planetary high-energy ball mill for ball milling; use argon for protection, stainless steel balls as the ball milling medium, add stainless steel balls with a diameter of Ф6~Ф10 mm as the ball milling medium , the mass ratio of balls to powder is 8:1, the milling speed is 250 rpm, and the ball milling time is set to 30 h; Open the ball mill tank in the operation box, and put the powder sample into the sample bag.

[0036] Step 2: The SLM forming system used mainly includes: high-power Nd:YAG (λ=1.064 μm) laser, computer system for forming control, automatic powder spreading device and protective atmosphere device. Fir...

Embodiment 2

[0041] Step 1: The mixed powder is composed of TiC powder with a purity of more than 99.8% and an average particle size of 50-70 nm and W powder with a purity of more than 99.9% and an average particle size of 4.5-5.5 μm, of which the TiC powder component accounts for the total content of 1.3wt.%, and put it in Pulverisette 6 single-pot planetary high-energy ball mill of German Fristsch company for ball milling; use argon gas for protection, stainless steel balls as ball milling medium, add stainless steel balls with a diameter of Ф6~Ф10 mm as ball milling The medium, the mass ratio of balls to powder is 8:1, the ball milling speed is 300 rpm, and the ball milling time is set to 35 h; Open the ball mill tank in the vacuum operation box, and put the powder sample into the sample bag.

[0042] Step 2: The SLM forming system used mainly includes: high-power Nd:YAG (λ=1.064 μm) laser, computer system for forming control, automatic powder spreading device and protective atmosphere ...

Embodiment 3

[0047] Step 1: The mixed powder is composed of TiC powder with a purity of more than 99.8% and an average particle size of 50-70 nm and W powder with a purity of more than 99.9% and an average particle size of 4.5-5.5 μm, of which the TiC powder component accounts for the total content of 1.5 wt.%, and put it in Pulverisette 6 single-pot planetary high-energy ball mill of German Fristsch Company for ball milling; use argon gas for protection, stainless steel balls as ball milling medium, add stainless steel balls with a diameter of Ф6~Ф10 mm as ball milling The medium, the mass ratio of balls to powder is 10:1, the ball milling speed is 300 rpm, and the ball milling time is set to 45 h; Open the ball mill tank in the vacuum operation box, and put the powder sample into the sample bag.

[0048] Step 2: The SLM forming system used mainly includes: high-power Nd:YAG (λ=1.064 μm) laser, computer system for forming control, automatic powder spreading device and protective atmospher...

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Abstract

The invention belongs to the technical field of laser rapid forming, and particularly relates to preparation of a solid solution toughened wolfram-base composite material. A preparation method of the solid solution toughened wolfram-base composite material is as follows: original mixed powder comprises W (wolfram) powder and TiC powder, wherein the TiC powder is 1-1.5wt percent of the total content; and the mixed powder is ball-milled in a high-energy mechanical ball mill for 30-45 h, and then the TiC/W composite material is formed by using a selective laser melting process. The parameters of the adopted laser process are as follows: the powder-bed depth is 50-60 Mum, the laser spot diameter is 200-210 Mum, the laser power is 120-140 W, the laser scanning rate is 100-300 mm/s, and the laser scanning interval is 120-140 Mum. According to the invention, the solid solution toughened wolfram-base composite material is successfully prepared through the method that combines high-energy mechanical ball milling and the selective laser melting process, and the fragility of W material is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of laser rapid prototyping, in particular to the preparation of a solid-solution toughened tungsten-based composite material. Background technique [0002] W and its alloys, due to their superior properties, such as high melting point, high elastic modulus, high thermal shock resistance, low thermal expansion coefficient and good high-temperature strength, make them ideal high-temperature structural materials. However, some of their unique brittleness, namely low temperature brittleness, recovery recrystallization brittleness and irradiation brittleness, greatly limit the application of W and its alloys as structural materials. Studies have shown that the brittleness of W and its alloys is mainly caused by the generation and propagation of cracks at the grain boundaries, while the toughness of W and its alloys is closely related to the grain size and distribution. The smaller the grain size, the better the d...

Claims

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Application Information

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IPC IPC(8): C22C27/04C22C1/05B22F3/105
CPCY02P10/295Y02P10/25
Inventor 顾冬冬张国全王泓乔
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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