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Nano TiB2 particle reinforced metal-base composite material and preparation method thereof

A technology of particle reinforcement and composite materials, which is applied in the field of composite materials, can solve problems such as insufficient strength, and achieve the effects of increasing tensile strength at room temperature, improving material performance, and low cost

Active Publication Date: 2014-11-26
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although its room temperature hardness, elongation, and bending strength have been improved, the TiB produced by this reaction 2 The size is around 1~10μm, the volume fraction of borides added must be less than 10vol%, otherwise there will be unreacted coarse borides, which still cannot meet the demand for strength

Method used

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  • Nano TiB2 particle reinforced metal-base composite material and preparation method thereof
  • Nano TiB2 particle reinforced metal-base composite material and preparation method thereof
  • Nano TiB2 particle reinforced metal-base composite material and preparation method thereof

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preparation example Construction

[0028] The present invention also provides a kind of above-mentioned nano-TiB 2 A method for preparing particle-reinforced metal matrix composites, the preparation method makes TiB 2 The fine and dispersed particles are distributed in the metal matrix material to ensure that the strength, toughness and high temperature strength of the composite material are improved at the same time, such as figure 1 Shown in the flowchart, the concrete steps of the preparation method are as follows:

[0029] The first step is augmentation body preprocessing.

[0030] Ultrafine Nano TiB 2 Particle pretreatment: After mixing the reinforcement particles and metal additives, they are compounded on a ball mill to form a composite powder; the metal additives use the same alloy scrap or alloy powder as the matrix alloy. The volume ratio of the reinforcement particles to the metal additive is 1:2 to 2:1.

[0031] The conditions of the composite ball milling are as follows: the ball milling time i...

Embodiment 1

[0036] Example 1: Preparation of 5vol%TiB 2 Reinforced TiAl-based composites, using TiB 2 The particle size is 20nm.

[0037] TiB 2 The particles are evenly mixed with TiAl powder, and the reinforcement TiB is guaranteed in the mixed powder 2 The volume ratio of particles to TiAl powder is 1:2, TiB 2 The particle size is 20nm. A ball mill is used for ball milling, the ball milling time is 1h, the ball milling speed is 200r / min, and the ball-to-material ratio is 2:1. After the ball milling, the temperature of the ball milling tank will be higher, and the tank can be opened after it is completely cooled. Open the ball mill tank in the vacuum operation box, and put the composite powder obtained after ball milling into the sample bag. The composite powder after ball milling was pre-compacted under atmospheric conditions of 25°C, the pressure was 1 MPa, and the holding time was 10 minutes, and it was used as a composite powder pre-compaction block. The compacted composite ...

Embodiment 2

[0039] Example 2: Preparation of 5vol%TiB 2 Reinforced TiAl-based composites, using TiB 2 The particle size is 80nm.

[0040] TiB 2 The particles and TC4 alloy chips are evenly mixed, and the volume ratio of reinforcement particles to TiAl alloy chips in the mixed powder is guaranteed to be 2:3, and TiB 2 The particle size is 80nm. A ball mill is used for ball milling, the ball milling time is 4 hours, the ball milling speed is 400r / min, and the ball-to-material ratio is 4:1. The composite powder after ball milling was pre-compacted under atmospheric conditions of 25°C with a pressure of 5 MPa and a holding time of 10 minutes, and it was used as a composite powder pre-compaction block. The pre-pressed block is pre-placed in the hollow TiAl alloy. Particle-reinforced titanium-aluminum matrix composites were smelted using an induction furnace. The melting conditions of the induction furnace are as follows: medium frequency induction furnace + graphite crucible melting, t...

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Abstract

The invention discloses a nano TiB2 particle reinforced metal-base composite material and a preparation method thereof. The composite material reinforcer nano TiB2 particle accounts for 1-30 vol% of the composite material, the particle size is 20-500nm, and the matrix alloy is TiAl or Ti-base alloy. The preparation method comprises the following steps: mixing the reinforcer particle and metal additive, and carrying out composite ball milling to form composite powder; precompacting the composite powder to obtain a precompacted block; and finally, putting the precompacted block in a hollow matrix alloy ingot, and carrying out vacuum smelting to obtain the nano TiB2 particle reinforced metal-base composite material. The invention overcomes the defect of uncontrollable particle size of the reinforcer in the in-situ synthesis method, and avoids the problem of aggregation due to direct addition of ultrafine particles, so that the material can have favorable reinforced effect, thereby improving the room-temperature and high-temperature strength and elongation percentage of the material.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to a particle-reinforced composite material and a casting preparation process thereof, in particular to a nano-TiB2 particle-reinforced metal-based composite material and a preparation method thereof. Background technique [0002] Ti-based and TiAl-based alloys have the advantages of high melting point, low density, high elastic modulus, excellent oxidation resistance, corrosion resistance and creep resistance, and high specific strength and specific stiffness, making it possible to replace some nickel Based on superalloys, it has broad application prospects. However, TiAl-based alloys have low room temperature plasticity and insufficient oxidation resistance above 760 °C, and the low high-temperature performance of Ti-based alloys above 650 °C has become the main obstacle to the practical application of Ti-based and TiAl-based alloys. [0003] Metal matrix composites com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C22C14/00C22C32/00C22C1/02
Inventor 吴国清贾红叶李志燕
Owner BEIHANG UNIV
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