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In-situ WC ceramic-based composite material prepared by selective laser melting and method thereof

A technology for selective laser melting and composite materials, which is applied in the field of in-situ WC ceramic matrix composite materials and its preparation, which can solve the problems of limited cemented carbide, poor brittleness, and limited shape of formed parts, etc., and achieves the realization of process-structure - The effect of performance

Inactive Publication Date: 2018-11-27
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cemented carbide prepared by traditional powder metallurgy is usually limited by the shape of formed parts, high brittleness and poor machinability, these unfavorable conditions limit the practical application of cemented carbide

Method used

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  • In-situ WC ceramic-based composite material prepared by selective laser melting and method thereof
  • In-situ WC ceramic-based composite material prepared by selective laser melting and method thereof
  • In-situ WC ceramic-based composite material prepared by selective laser melting and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047]Step 1: The mixed powder is composed of pure W powder with a purity of >99.9%, an average particle size of 5 μm, and an equiaxed shape, and a pure W powder with a purity of >99.9%, an average particle size of 22.5 μm, and an irregular shape. Pure Ni powder, pure graphite powder with a purity of >99.9%, an average particle size of 30 μm, and an equiaxed structure. The mass fraction of pure W powder in the mixed powder is 85 wt%, and the mass fraction of pure nickel powder is 10 wt%, the mass fraction of pure graphite powder is 5 wt%;

[0048] Step 2: Use a planetary high-energy ball mill for mechanical alloying ball milling, put 50 g of mixed powder and 500 g of stainless steel balls into the ball milling tank in sequence, the ball-to-material ratio is 10: 1, the ball milling speed is 300 rpm, and the ball milling time is 35 h;

[0049] Step 3: Establish a three-dimensional digital model of the sample to be processed, and use layering software to slice the model layer by...

Embodiment 2

[0053] Step 1: The mixed powder is composed of pure W powder with a purity of >99.9%, an average particle size of 5 μm, and an equiaxed shape, and a pure W powder with a purity of >99.9%, an average particle size of 22.5 μm, and an irregular shape. Pure Ni powder, pure graphite powder with a purity of >99.9%, an average particle size of 30 μm, and an equiaxed structure. The mass fraction of pure W powder in the mixed powder is 85 wt%, and the mass fraction of pure nickel powder is 10 wt%, the mass fraction of pure graphite powder is 5 wt%;

[0054] Step 2: Use a planetary high-energy ball mill for mechanical alloying ball milling, put 50 g of mixed powder and 500 g of stainless steel balls into the ball milling tank in sequence, the ball-to-material ratio is 10: 1, the ball milling speed is 300 rpm, and the ball milling time is 35 h;

[0055] Step 3: Establish a three-dimensional digital model of the sample to be processed, and use layering software to slice the model layer b...

Embodiment 3

[0059] Step 1: The mixed powder is composed of pure W powder with a purity of >99.9%, an average particle size of 5 μm, and an equiaxed shape, and a pure W powder with a purity of >99.9%, an average particle size of 22.5 μm, and an irregular shape. Pure Ni powder, pure graphite powder with a purity of >99.9%, an average particle size of 30 μm, and an equiaxed structure. The mass fraction of pure W powder in the mixed powder is 85 wt%, and the mass fraction of pure nickel powder is 10 wt%, the mass fraction of pure graphite powder is 5 wt%;

[0060] Step 2: Use a planetary high-energy ball mill for mechanical alloying ball milling, put 50 g of mixed powder and 500 g of stainless steel balls into the ball milling tank in sequence, the ball-to-material ratio is 10: 1, the ball milling speed is 300 rpm, and the ball milling time is 35 h;

[0061] Step 3: Establish a three-dimensional digital model of the sample to be processed, and use layering software to slice the model layer b...

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Abstract

The invention discloses an in-situ WC ceramic-based composite material prepared by selective laser melting and a method thereof. The in-situ WC ceramic-based composite material is prepared by processing and forming W-Ni-C nano composite powder by means of an SLM forming technology. The in-situ WC ceramic-based composite material is a hard alloy-based composite material which takes a WC tissue or aWC tissue and a Ni2W4 tissue as a structural phase and Ni and W as a sticking phase. When the structural phase is the WC tissue, the sticking phase is distributed around the WC tissue; when the structural phase is the WC tissue and the Ni2W4C tissue, the Ni2W4C tissue is located between the WC tissue and the sticking phase. Therefore, the comprehensive mechanical property of the ceramic-based hard alloy can be improved.

Description

technical field [0001] The invention belongs to the technical field of laser additive manufacturing, and in particular relates to an in-situ WC ceramic matrix composite material and a preparation method thereof. Background technique [0002] As the main component of cemented carbide, WC has a high melting point (2870 ℃), high density (15.63g / cm3), high elastic modulus (71GPa), low thermal expansion coefficient (3.84 X 10-6 / ℃) and high resistance Compressive strength (56MPa) and other characteristics make it widely used in the preparation of cutting tools, armor-piercing projectile cores, mining machine drill bits, engine nozzles and other parts. In particular, transition metal elements such as Co, Ni and Fe are used as the binder phase to prepare WC cemented carbide matrix composites. Due to the existence of the metal binder phase at the grain boundary of WC, the composite material can be improved by means of stress loss under mechanical load. The overall toughness of the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C29/08B22F3/105
CPCC22C1/055C22C29/067C22C29/08B22F10/00B22F10/34B22F10/28Y02P10/25
Inventor 顾冬冬林开杰戴冬华夏木建郭朦程灵钰刘正武王联凤赵维刚
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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