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Preparation method of TiBw/Ti-6Al-4V composite bar adopting quasi-continuous reticular structure

A technology of ti-6al-4v and composite materials, which is applied in the field of material preparation, can solve problems such as incapable of large-scale production, low production efficiency, and complicated preparation process, and achieve good tissue uniformity, short production cycle, and simplified preparation process Effect

Active Publication Date: 2015-01-07
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the technical problems of the existing TiBw / Ti-6Al-4V composite material with complex preparation process, high cost, low production efficiency, high equipment requirements and incapable of large-scale production, and provides a simple process, low cost, production Preparation method of quasi-continuous network structure TiBw / Ti-6Al-4V composite material rod with high efficiency, low equipment requirements, and large-scale production

Method used

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  • Preparation method of TiBw/Ti-6Al-4V composite bar adopting quasi-continuous reticular structure
  • Preparation method of TiBw/Ti-6Al-4V composite bar adopting quasi-continuous reticular structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Low-energy ball mill mixed powder: spherically atomized Ti-6Al-4V powder with a particle size of 130 μm and TiB with a particle size of 2 μm 2 The powder is mixed by ball milling to make the fine TiB 2 The powder is uniformly coated on the surface of the large particle Ti-6Al-4V, thus obtaining TiB 2 / Ti-6Al-4V mixed powder, the process conditions are as follows: the ball milling speed is 120r / min, the ball milling time is 8h, and the mass ratio of ball to material is 5:1.

[0024] (2) Cold press forming: TiB 2 / Ti-6Al-4V mixed powder is placed in a metal sheath, and is formed by cold pressing at a pressure of 900MPa, then vacuum degassed, sealed and welded to obtain an extrusion billet, and the vacuum degree is 10 -3 Pa.

[0025] (3) Pre-sintering and hot extrusion: pre-sinter the extruded billet obtained in step (2) at 1050°C for 1 hour, and in situ react self-generated TiB whiskers (TiBw) to obtain a pre-sintered extruded billet . Then, the pre-sintered extr...

Embodiment 2

[0028] (1) Low-energy ball mill mixed powder: spherically atomized Ti-6Al-4V powder with a particle size of 75 μm and TiB with a particle size of 3 μm 2 The powder is mixed by ball milling to make the fine TiB 2 The powder is uniformly coated on the surface of the large particle Ti-6Al-4V, thus obtaining TiB 2 / Ti-6Al-4V mixed powder, the process conditions are as follows: the ball milling speed is 90r / min, the ball milling time is 10h, and the mass ratio of ball to material is 5:1.

[0029] (2) Cold press forming: TiB 2 / Ti-6Al-4V mixed powder is placed in a metal sheath, and is formed by cold pressing at a pressure of 800MPa, then vacuum degassed, sealed and welded to obtain an extrusion billet, and the vacuum degree is 10 -3 Pa.

[0030] (3) Pre-sintering and hot extrusion: Pre-sinter the extruded billet obtained in step (2) at 1000°C for 2 hours, and in situ react self-generated TiB whiskers (TiBw) to obtain a pre-sintered extruded billet . Then, the pre-sintered extr...

Embodiment 3

[0033] (1) Low-energy ball mill mixed powder: spherically atomized Ti-6Al-4V powder with a particle size of 175 μm and TiB with a particle size of 1 μm 2 The powder is mixed by ball milling to make the fine TiB 2 The powder is uniformly coated on the surface of the large particle Ti-6Al-4V, thus obtaining TiB 2 / Ti-6Al-4V mixed powder, the process conditions are as follows: the ball milling speed is 150r / min, the ball milling time is 6h, and the mass ratio of ball to material is 5:1.

[0034] (2) Cold pressing forming: TiB 2 / Ti-6Al-4V mixed powder is placed in a metal sheath, and it is formed by cold pressing at a pressure of 1000MPa, then vacuum degassed, sealed and welded to obtain an extrusion billet, and the vacuum degree is 10 -3 Pa.

[0035] (3) Pre-sintering and hot extrusion: Pre-sinter the extrusion billet obtained in step (2) at 1200°C for 0.5h, and in situ react self-generated TiB whiskers (TiBw) to obtain pre-sintered extrusion billet. Then, the pre-sintered ...

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Abstract

The invention relates to a preparation method of a TiBw / Ti-6Al-4V composite bar adopting a quasi-continuous reticular structure and solves problems that existing Ti-6Al-4V composites are harsh in technological condition, high in equipment requirement, low in production efficiency, difficult to produce on a large scale and the like. The method comprises steps as follows: low-energy ball milling and mixing are performed on spherical Ti-6Al-4V powder and TiB2 powder firstly; then TiB2 / Ti-6Al-4V mixed powder is placed in a metal sheath for cold press molding, and vacuum degassing and sheath sealing welding are performed to obtain an extrusion billet; finally, short-time pre-sintering is performed on the obtained extrusion billet, and hot extrusion deformation is performed on the pre-sintered extrusion billet to obtain a required material. The method can be applied to preparation of a TiBw / Ti-6Al-4V composite adopting the quasi-continuous reticular structure.

Description

technical field [0001] The invention relates to a material preparation method, in particular to a preparation method of a quasi-continuous network structure TiBw / Ti-6Al-4V composite material bar. Background technique [0002] Titanium-based composites have better high-temperature performance and creep resistance than titanium alloys, and can be widely used in aerospace, automobiles, ships, and chemicals. However, titanium-based composites are limited by the high cost of preparation and difficulty in forming. its wider application. [0003] Usually, in order to prepare TiBw / Ti-6Al-4V composite material rods, the TiBw / Ti-6Al-4V composite material billets are first prepared by melting casting or powder metallurgy, and then thermally deformed to obtain the required specifications of the titanium base. Composite rods. However, the TiBw / Ti-6Al-4V composite ingot prepared by melting and casting method has coarse structure, shrinkage cavity, porosity and component segregation, etc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C14/00
Inventor 张文丛陈文振杨建雷于洋冯养巨
Owner HARBIN INST OF TECH AT WEIHAI
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