Low-cost high-performance TiBw/Ti composite as well as preparation method and application thereof

Abstract

The invention discloses a low-cost and high-performance TiBw / Ti composite as well as a preparation method and application thereof. The method comprises the following steps of mixing and ball-milling nano TiB2 powder and stearic acid, then mixing a product with titanium hydride powder, and conducting compression molding and sintering to obtain the TiBw / Ti titanium-based composite with uniformly distributed TiB ceramic phases; and using TiB2 and a matrix to conduct an in-situ reaction to obtain a TiB reinforced phase, and obtaining the TiBw / Ti composite. By using the low-cost and high-performance TiBw / Ti composite as well as the preparation method and the application, the tensile strength of the prepared TiBw / Ti composite reaches 740MPa, the percentage elongation after fracture reaches 6.1%, and the breakthrough that the tensile plasticity of the titanium-based composite prepared by sintering titanium hydride is changed from nothing is achieved. The composite prepared by the invention is wide in 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, its proportion of use in various fields is increasing, and its application in civil applications is getting more and more attention. People are constantly pursuing titanium materials with higher performance within the affordable cost range. At present, improving the performance of titanium alloys mainly depends on the development of new alloy materials and the refinement of the grain size of materials. Since the discovery of titanium, researchers have developed a large number of titanium alloy grades with excellent performance, such as Ti60, TC21, BT37 and so on. In recent years, the development of new grades of titanium ...

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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