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In-situ autogenous TiB+TiC/Ti composite material based on Ti-B4C-C series and preparing method thereof

A composite material and in-situ self-generation technology, which is applied in the field of preparation technology of in-situ self-generated reinforced titanium-based composite materials, can solve the problem that the volume ratio of TiB and TiC cannot be changed, and achieve wettability problems, excellent mechanical properties, distribution uniform effect

Inactive Publication Date: 2008-02-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the Ti-B 4 The problem that the volume ratio of TiB and TiC in the preparation of titanium base cannot be changed by C system, the present invention provides a method based on Ti-B 4 Preparation method of C-C system in-situ self-generated TiB+TiC / Ti composite material

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  • In-situ autogenous TiB+TiC/Ti composite material based on Ti-B4C-C series and preparing method thereof

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specific Embodiment approach 1

[0028] Specific implementation mode one: the Ti-B-based 4 The in-situ self-generated TiB+TiC / Ti composite material of the C-C system is composed of Ti matrix, TiB and TiC reinforcement phase. The tensile strength of the composite material is ≥900MPa, the elongation is 0.4-5.0%, and the volume ratio of TiB to TiC is Any ratio not equal to 4:1, that is, the volume ratio of TiB to TiC is 4:1+x, x>0.

[0029] In this embodiment, the TiB and TiC account for 10% of the total volume of the composite material, and the volume content of TiB and TiC in the Ti-based composite material can also be adjusted according to different needs.

[0030] In this embodiment, the Ti particle size ranges from 1 to 20 μm, and B 4 C Average particle size 1 μm.

specific Embodiment approach 2

[0031] Embodiment 2: Different from Embodiment 1, the values ​​of x in this embodiment are 1, 3, 7, and 15 respectively. The finally obtained volume ratios of TiB and TiC are: 2:1, 1:1, 1:2, 1:4 respectively. The specific proportioning of raw materials is as shown in Table 1:

[0032] Table 1 The volume ratio of TiB and TiC in the composite material and the proportion content of various powders

[0033]

specific Embodiment approach 3

[0034] Specific embodiment three: This embodiment prepares Ti-B-based 4 In situ self-generated TiB+TiC / Ti composites of C-C system:

[0035] 1. Mixture:

[0036] When mixing materials, weigh titanium powder, boron carbide powder, graphite powder according to the following reaction equation, (5+x+y)Ti+B 4 C+xC=4TiB+(1+x)TiC+yTi, in the formula: x is the molar weight of the added C powder, y is the final molar weight of titanium as the matrix, and then on the planetary ball mill at a speed of 300~ Mix for 6-10 hours under the conditions of 500r / min and ball-to-material ratio of 1:1 to achieve the best powder mixing effect. Since graphite itself is a process control agent with good performance, it not only participates in the reaction to act as a reaction component during the reaction, participates in the reaction to form TiC particles, but also acts as a process control agent in the mixing process, reducing the The degree of adhesion of the powder to the ball during the mixin...

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Abstract

An in-situ autogenous TiB+TiC / Ti composition based on Ti-B4C-C system is composed of Ti as basic material and the reinforcing phase (TiB and TiC, whose volume ratio is not 4:1), and is prepared from Ti powder, boron carbide powder and graphite powder through mixing by ball grinding, vacuum degassing, loading in graphite mould, cold pressing, vacuum hot pressing and sintering, and hot extruding. Its advantages are high mechanical performance and high processibility.

Description

technical field [0001] The invention relates to a preparation process of a composite material, in particular to a preparation process of an in-situ self-generated reinforced titanium-based composite material. Background technique [0002] Titanium matrix composites (TMCs, in which the content of titanium exceeds 50%) have high specific strength, specific stiffness, specific elastic modulus and good creep properties, so they are very attractive in the field of aerospace and become ideal for this field. It is widely used in aeroengine blades, racks, landing gear beams, rocket engine cases and other components. Especially with the development of discontinuously reinforced titanium matrix composites (Discontinuously reinforced titanium matrix composites, DRTMCs), the research of TMCs shows a new situation of vigorous development. In recent years, this type of material has also shown good application prospects in civil industry, and has become an extremely active branch in the r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C45/10C22C1/05
Inventor 耿林倪丁瑞马宗义郑镇洙孟庆武
Owner HARBIN INST OF TECH