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Method for strengthening interface bonding of GNPs/Ti composite by directionally growing TiBw

A composite material and directional growth technology, which is applied in the field of directional growth of TiBw to strengthen the interface bonding of GNPs/Ti composite materials, can solve problems such as optimizing the interface structure of GNPs/Ti composite materials, deteriorating the interface bonding characteristics of composite materials, and chaotic TiBw distribution. Good application prospects, solve the mismatch between strength and plasticity, and improve the effect of strong-plasticity matching performance

Active Publication Date: 2020-11-17
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In TiBw / Ti prepared by traditional powder metallurgy and smelting and casting methods, the distribution of TiBw is chaotic, which is not suitable for optimizing the interface structure of GNPs / Ti composites, and even worsens the interfacial bonding properties of composites

Method used

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  • Method for strengthening interface bonding of GNPs/Ti composite by directionally growing TiBw
  • Method for strengthening interface bonding of GNPs/Ti composite by directionally growing TiBw
  • Method for strengthening interface bonding of GNPs/Ti composite by directionally growing TiBw

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046](1) B nano powder and GNPs are evenly mixed

[0047] B nanopowder and GNPs were accurately weighed and dispersed in absolute ethanol at a mass ratio of 1:100, and ultrasonically dispersed for 0.1h under an ultrasonic power of 500W to obtain a B@GNPs solution;

[0048] (2) Preparation of B@GNPs / Ti composite powder

[0049] Spherical pure Ti powder with an average particle size of 30 μm was added to the B@GNPs solution, stirred magnetically for 5 min at a stirring rate of 500 r / min, filtered and dried to obtain a B@GNPs / Ti composite powder; wherein, GNPs were The mass fraction in B@GNPs / Ti composite powder is 1%;

[0050] (3) Sintering

[0051] Put the B@GNPs / Ti composite powder into a heat-resistant steel mold, use the SPS device to raise the temperature to 600°C (measurement temperature at the temperature measurement hole of the steel mold), and apply a pressure of 100MPa at the same time, keep the temperature at 600°C and 100MPa 5min, and then cooled with the furnace...

Embodiment 2

[0056] (1)TiB 2 Nano powder mixed with GNPs evenly

[0057] TiB 2 The nanopowder and GNPs were accurately weighed and dispersed in absolute ethanol at a mass ratio of 1:20, and ultrasonically dispersed for 1 h at an ultrasonic power of 300 W to obtain TiB 2 @GNPs solution;

[0058] (2)TiB 2 Preparation of @GNPs / Ti6Al4V Composite Powder

[0059] Flake Ti6Al4V alloy powder with an average particle size of 30 μm was added to TiB 2 In the @GNPs solution, after magnetic stirring at a stirring rate of 200r / min for 60min, filter and dry to obtain TiB 2 @GNPs / Ti6Al4V composite powder; among them, GNPs in TiB 2 The mass fraction of @GNPs / Ti6Al4V composite powder is 0.01%;

[0060] (3) Sintering

[0061] TiB 2 The @GNPs / Ti6Al4V composite powder is put into a heat-resistant steel mold, and the temperature is raised to 700°C (measured temperature at the temperature measuring hole of the steel mold) by the SPS device, and a pressure of 350MPa is applied at the same time, and the t...

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Abstract

The invention relates to a method for strengthening interface bonding of a GNPs / Ti composite by directionally growing TiBw, and belongs to the technical field of composite preparation. The method includes the following steps: adsorbing boron-containing substance nano powder on the surface of GNPs, and then uniformly mixing the boron-containing substance nano powder with titanium-based metal powderto obtain boron-containing substance-coated GNPs / Ti composite powder; sintering the composite powder at a local high temperature to obtain a boron-containing substance-coated GNPs / Ti green body; andcarrying out heat treatment on the green body to obtain the GNPs- (TiBw) / Ti composite. TiBw in in-situ synthesis orientation is connected with and strengthens multiple interfaces of Ti-TiC-GNPs, the effect of threading is achieved, then the interface bonding strength of the GNPs / Ti composite is improved, good plasticity can be kept while the strength is improved, the strong plasticity matching performance of the GNPs / Ti composite is improved, and a new thought is provided for optimizing the mechanical property of the GNPs / Ti composite. The method is easy to operate, short in preparation process and high in universality, and has a good application prospect.

Description

technical field [0001] The invention relates to a method for directional growth of TiBw to strengthen the interface bonding of GNPs / Ti composite materials, belonging to the technical field of composite material preparation. Background technique [0002] Graphene nanosheets (GNPs) reinforced titanium matrix composites (GNPs / Ti) have excellent properties such as high specific strength, high specific modulus, low density, wear resistance and corrosion resistance, and are widely used in aviation, aerospace, transportation and other fields prospect. However, the high processing temperature of GNPs / Ti leads to severe interfacial reactions in the GNPs-Ti interface region, which evolves into Ti-TiC-GNPs multiple interfaces. The crystal structures of TiC and Ti do not match, and interdiffusion of Ti and C atoms occurs around TiC to form a non-stoichiometric TiCx (0.46<x<0.97) transition layer. Due to the continuous change of C concentration, TiC cannot have a coherent orienta...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C1/10C22C14/00B22F3/105B22F3/24
CPCC22C1/05C22C14/00B22F3/24B22F2003/248
Inventor 张洪梅刘亮李云凯程兴旺范群波穆啸楠
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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