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A kind of preparation method of high-strength, high-hardness and low-modulus titanium boride nanocomposite ceramics

A composite ceramic and high hardness technology, which is applied in the preparation of high hardness and low modulus titanium boride nanocomposite ceramics, high strength field, can solve the problems of reducing material hardness and application restrictions, and achieve the improvement of hardness and strength, Effects of low elastic modulus and cheap raw materials

Active Publication Date: 2022-07-19
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But their introduction also greatly reduces the hardness of the material, which limits the application of the ceramic side in metal-ceramic joint parts

Method used

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  • A kind of preparation method of high-strength, high-hardness and low-modulus titanium boride nanocomposite ceramics
  • A kind of preparation method of high-strength, high-hardness and low-modulus titanium boride nanocomposite ceramics
  • A kind of preparation method of high-strength, high-hardness and low-modulus titanium boride nanocomposite ceramics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] with TiC 0.7 N 0.3 (particle size is 5-20μm) and boron powder (particle size is 0.1-1.5μm) as raw materials, according to equation (3) to prepare

[0032] TiC 0.7 N 0.3 +5.1 B=TiB 2 +0.7B 4 C+0.3 BN (3)

[0033] The phase composition (volume content) of the obtained sample is 45% TiB 2 -45%B 4 C-10%BN.

[0034] Using acetone (purity>99%) as solvent and 3Y-TZP balls as mixing medium, mix the weighed powder and use a mixer for mixing at a mixing speed of 30-100rpm. After mixing for 12-36 hours, the obtained slurry was dried at 60-85°C by vacuum rotary steaming. The dried powder is crushed and sieved, and then poured into a graphite mold, and pressure sintered by a discharge plasma sintering equipment. The whole process is carried out under vacuum.

[0035] The sintering process includes the following steps: from room temperature to 700 °C, the heating rate is 100 °C / min, and the pressure applied to the sample is 5 MPa. The pressure was raised to 60 MPa within 1...

Embodiment 2

[0038] with TiC 0.5 N 0.5 (particle size is 5-20μm) and boron powder (particle size is 0.1-1.5μm) as raw materials, according to equation (4) for batching

[0039] TiC 0.5 N 0.5 +4.5 B=TiB 2 +0.5B 4 C+0.5 BN (4)

[0040] The phase composition (volume content) of the obtained sample is 48% TiB 2 -35%B 4 C-17%BN.

[0041]Using acetone (purity>99%) as solvent and 3Y-TZP balls as mixing medium, mix the weighed powder and use a mixer for mixing at a mixing speed of 30-100rpm. After mixing for 12-36 hours, the obtained slurry was dried at 60-85° C. by means of vacuum rotary evaporation. The dried powder is crushed and sieved, and then poured into a graphite mold, and pressure sintered by a discharge plasma sintering equipment. The whole process is carried out under vacuum.

[0042] The sintering process includes the following steps: from room temperature to 700 °C, the heating rate is 100 °C / min, and the pressure applied to the sample is 5 MPa. The pressure was raised to ...

Embodiment 3

[0044] with TiC 0.5 N 0.5 (particle size is 5-20μm) and boron powder (particle size is 0.1-1.5μm) as raw materials, according to equation (4) for batching

[0045] TiC 0.5 N 0.5 +4.5 B=TiB 2 +0.5B 4 C+0.5 BN (4)

[0046] The phase composition (volume content) of the obtained sample is 48% TiB 2 -35%B 4 C-17%BN.

[0047] Using acetone (purity>99%) as solvent and 3Y-TZP balls as mixing medium, mix the weighed powder and use a mixer for mixing at a mixing speed of 30-100rpm. After mixing for 12-36 hours, the obtained slurry was dried at 60-85° C. by means of vacuum rotary evaporation. The dried powder is crushed and sieved, and then poured into a graphite mold, and pressure sintered by a discharge plasma sintering equipment. The whole process is carried out under vacuum.

[0048] The sintering process includes the following steps: from room temperature to 700 °C, the heating rate is 100 °C / min, and the pressure applied to the sample is 5 MPa. The pressure was raised to...

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Abstract

The invention provides a preparation method of high-strength, high-hardness and low-modulus titanium boride nanocomposite ceramics, which is characterized in that: using commercially available TiC x N 1‑x , B, B 4 C and Si powders are used as raw materials, and the powders are proportioned according to the corresponding chemical reaction equations. The raw material powders are mixed, dried, and sieved, and then densified by hot-pressing sintering or discharge plasma to obtain the desired complex. Phase ceramics. The method of the present invention utilizes the solid solution effect of the reaction sintering raw materials, and can obtain TiB through the feature that the reaction and sintering occur at the same time. 2 Multiphase ceramics with nanoscale grains, the final multiphase ceramics have high strength, hardness and low elastic modulus at the same time; and the raw materials are cheap, convenient and easy to obtain, the preparation process is simple, and the cycle is short. The sintering and densification of the multiphase ceramic can be realized, which is beneficial to reduce the energy consumption required in the material preparation process and obtain the high density of the ceramic.

Description

technical field [0001] The invention belongs to the field of non-oxide structural ceramics, and in particular relates to a preparation method of high-strength, high-hardness and low-modulus titanium boride nanocomposite ceramics. Background technique [0002] Through the connection and composite of metal and ceramic, the respective performance advantages of metal and ceramic materials can be fully utilized, thereby forming a macro-structure composite component with better performance. However, the strain tolerance of general ceramic materials is very small, and compared with metal materials such as steel, it has a higher elastic modulus. When used in connection with metal materials, the ceramic part is often damaged due to excessive thermal or mechanical stress. Happening. This makes the reliability of metal-ceramic connection parts in service decline, and obtaining high-strength and low-modulus ceramic materials is the key to solving this problem. [0003] There are gener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/58C04B35/622C04B35/64
CPCC04B35/58071C04B35/622C04B35/64C04B2235/3826C04B2235/3821C04B2235/785C04B2235/781C04B2235/428C04B2235/421C04B2235/38
Inventor 邹冀刘晶晶季伟傅正义
Owner WUHAN UNIV OF TECH
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