Laser additive manufacturing method for La2O3/(Cu, Ni) functionally graded composites

A gradient function, laser additive technology, applied in additive manufacturing, additive processing, energy efficiency improvement, etc., can solve the problems of increasing material preparation cycle and energy consumption, and achieve the effect of short preparation cycle

Active Publication Date: 2018-12-28
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The usual method is to post-process the material to control the stress, such as: stress relief annealing, natural aging and shot peening, etc., but post-processing will increase the preparation cycle and energy consumption of the material

Method used

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  • Laser additive manufacturing method for La2O3/(Cu, Ni) functionally graded composites
  • Laser additive manufacturing method for La2O3/(Cu, Ni) functionally graded composites
  • Laser additive manufacturing method for La2O3/(Cu, Ni) functionally graded composites

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A kind of laser additive manufacturing La 2 o 3 / (Cu, Ni) the method for gradient function composite material, its step is as follows:

[0035] S1, the preparation of raw material powder;

[0036] La 2 o 3 The particle size of the powder is 2-10 μm, and the purity is 99.4%; the particle size of the Cu powder is 50-150 μm, and the purity is 99.9%; the particle size of the Ni45 powder is 50-150 μm, and the purity is 99.9%; the ratio of various powders is shown in Table 1.

[0037] Table 1 Various powder ratios and corresponding layer sequences

[0038]

[0039] Prepare 4 kinds of raw material powders according to the proportions in Table 1, mix the powders by ball milling, and put them into a drying oven. Drying temperature: 110°C, time: 90min, remove the moisture in the powders, and prepare 4 kinds of raw material powders.

[0040] S2, pretreatment of Cu substrate;

[0041] The selected Cu substrate size is 150×50×15mm 3 . Use 240# sandpaper to polish the surf...

Embodiment 2

[0053] A kind of laser additive manufacturing La 2 o 3 / (Cu, Ni) the method for gradient function composite material, its step is as follows

[0054] S1, the preparation of raw material powder;

[0055] La 2 o 3 The particle size of the powder is 2-10 μm, and the purity is 99.4%; the particle size of the Cu powder is 50-150 μm, and the purity is 99.9%; the particle size of the N545 powder is 50-150 μm, and the purity is 99.9%; the ratio of various powders is shown in Table 2.

[0056] Table 2 Various powder ratios and corresponding layer sequences

[0057]

[0058] Prepare 5 kinds of raw material powders according to the proportions in Table 2, mix them by ball milling, and put them into a drying oven. Drying temperature: 110°C, time: 90min, remove the moisture in the powders, and prepare 5 kinds of raw material powders.

[0059] S2, pretreatment of Cu substrate;

[0060] The selected Cu substrate size is 150×50×15mm 3 . Use 240# sandpaper to polish the surface of t...

Embodiment 3

[0070] A kind of laser additive manufacturing La 2 o 3 / (Cu, Ni) the method for gradient function composite material, its step is as follows

[0071] S1, the preparation of raw material powder;

[0072] La 2 o 3 The particle size of the powder is 2-10 μm, and the purity is 99.4%; the particle size of the Cu powder is 50-150 μm, and the purity is 99.9%; the particle size of the Ni45 powder is 50-150 μm, and the purity is 99.9%; the ratio of various powders is shown in Table 3.

[0073] Table 3 The sequence corresponding to various powder ratios

[0074]

[0075]

[0076] Prepare 4 kinds of raw material powders according to the proportions in Table 3, mix them by ball milling, and dry them in a drying oven at 110°C for 90 minutes to remove moisture from the powders; 4 kinds of raw material powders are prepared

[0077] S2, pretreatment of Cu substrate;

[0078] The selected Cu substrate size is 150×50×15mm 3 . Use 240# sandpaper to polish the surface of the substra...

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Abstract

The invention discloses a laser additive manufacturing method for La2O3 / (Cu,Ni) functionally graded composites. The laser additive manufacturing method comprises the following steps that raw materialpowder is prepared, specifically, La2O3 powder of rare earth metal oxide ceramics and Ni-based self-melting alloy powder are proportioned by a certain mass percentage, and the balance is Cu powder; pretreatment of a Cu substrate is performed; the preheating of the Cu substrate is performed; and the La2O3 / (Cu,Ni) gradient functional composites are manufactured by a laser additive. According to thelaser additive manufacturing method for the La2O3 / (Cu,Ni) functionally graded composites, La2O3 can improve the strength of materials, the organization is improved, a Ni-base self-melting alloy can improve the wettability of a melt, bonding strength of La2O3 and a metal matrix is improved, the obtained La2O3 / (Cu,Ni) functionally gradient composites have smooth macroscopic stress transition in a gradient layer, microscopic stress decreases gradually from bottom layer to top layer, and hardness and elastic modulus show the characteristics of gradient transition.

Description

technical field [0001] The invention relates to the field of laser additive manufacturing, in particular to a laser additive manufacturing La 2 o 3 / (Cu,Ni) gradient functional composites approach. Background technique [0002] Cu and its alloys are widely used because of their high electrical and thermal conductivity, but the strength of Cu is low. If the surface of Cu is modified, its service life can be improved under the application conditions of high-speed sliding electrical contact. However, when there is a large difference in thermophysical properties between the Cu matrix and the strengthening layer, thermal stress concentration will occur at the interface, which will easily cause the strengthening layer to fall off and cause the material to fail. In addition, the micro-stress existing inside the strengthening layer will cause defects such as micro-holes and micro-cracks. Therefore, it is necessary to regulate the thermal stress and microscopic stress to obtain a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C1/05C22C32/00C22C9/06C22C30/02C22C19/03B22F3/105B33Y10/00B22F7/06
CPCC22C1/0425C22C1/0433C22C1/05C22C9/06C22C19/002C22C19/03C22C30/02C22C32/0021C22C32/0026B22F7/06B33Y10/00B22F10/00B22F10/362B22F10/322B22F10/25B22F10/34B22F10/36Y02P10/25
Inventor 战再吉彭宇相曹海要
Owner YANSHAN UNIV
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