A low-cost high-performance tib w /ti composite material and its preparation method and application

Abstract

The invention discloses a low-cost and high-performance TiB w / Ti composite material and its preparation method and application. The method is: the nano-TiB 2 The powder is mixed with stearic acid and ball milled, then mixed with titanium hydride powder, pressed and sintered to obtain TiB with uniform TiB ceramic phase distribution. w / Ti titanium matrix composites. Use TiB 2 In situ reaction with the matrix to obtain a TiB reinforcement phase, to obtain a TiBw / Ti composite material. TiB prepared by the present invention w The tensile strength of the / Ti composite material reaches 740MPa, and the elongation after fracture reaches 6.1%, realizing a breakthrough in the tensile plasticity of the titanium-based composite material prepared by sintering titanium hydride from scratch. The composite material prepared by the invention has wide applicability.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal processing, and in particular relates to a low-cost and high-performance TiB w / Ti composite material and its preparation method and application. Background technique [0002] Titanium is an excellent structural material. With the development and progress of society, the proportion of its use in various fields is increasing, and its application in civil applications has received more and more attention. People continue to pursue higher performance titanium materials within an affordable cost range. At present, improving the performance of titanium alloys mainly depends on developing new alloy materials and refining the grain size of materials. Since the discovery of titanium, researchers have developed a large number of titanium alloy grades with excellent properties, such as Ti60, TC21, BT37 and so on. In recent years, the development of new grades of titanium alloys has been relativ...

AI Technical Summary

Problems solved by technology

[0005] (1) The conventional casting method to prepare titanium-based composite materials uses expensive pure titanium as the raw material, and needs to exceed the melting point of titanium during the smelting process, which consumes a lot of energy and has low material utilization.

high production costs

[0006] (2) Most of the titanium-based composites prepared by the conventional powder metallurgy method still use high-priced pure titanium powder as the raw material, and combine high-energy ball milling, element mixing and other methods to introduce the reinforcing phase, but there are the following deficiencies: First, ball milling The introduction of the reinforcement phase is easy to introduce impurity elements, which deteriorates the mechanical properties of the material; second, the introduction of the reinforcement phase by mixing powder is easy to mix the powder unevenly, and agglomeration occurs, which deteriorates the mechanical properties of the material; third, the selection of the sintering method is general It adopts pressure sintering or pressureless sintering combined with subsequent plastic deformation, and the production cost is high

[0007] (3) The interdiffusion rates of boron and titanium are quite different

During the sintering process, it is easy to form secondary holes due to the Kirkendall effect, which reduces the density of the material

In addition, the TiBw / Ti composite material prepared by pressureless sintering using titanium hydride powder as raw material also has problems such as uneven structure, low density, and poor mechanical properties.

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