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A boron carbide-based composite ceramic sintering aid and sintering process

A technology of composite ceramics and boron carbide, which is applied in the field of sintering aids and sintering technology of boron carbide-based composite ceramics, and can solve problems such as improving the fracture toughness of boron carbide ceramics

Active Publication Date: 2021-09-14
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of these sintering aids did not significantly improve the fracture toughness of boron carbide ceramics

Method used

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  • A boron carbide-based composite ceramic sintering aid and sintering process
  • A boron carbide-based composite ceramic sintering aid and sintering process
  • A boron carbide-based composite ceramic sintering aid and sintering process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: the preparation of sintering aid

[0036] In this example, the preparation method of the sintering aid for in-situ reaction hot-pressing sintering of boron carbide-based composite ceramics is as follows:

[0037] 1. Melt the proportioned amount of titanium and silicon using non-consumable arc smelting equipment. During the smelting process, in order to make the alloy composition uniform, smelting is repeated five times; titanium and silicon are composed of: titanium 24wt%, silicon 76 wt%.

[0038] 2. The alloy block obtained in step 1 is mechanically crushed, and then the powder is ball-milled into alloy powder with an average particle size of 10 μm by a ball mill.

[0039] 3. Mix the alloy powder obtained in step 2 with boron carbide powder (0.5 μm in particle size) and absolute ethanol by means of mechanical stirring and ultrasonic dispersion to obtain a reaction sintering mixed powder. The mass ratio of boron carbide to sintering aid is 7:3.

Embodiment 2

[0040] Embodiment 2: the preparation of sintering aid

[0041] In this example, the preparation method of the sintering aid for in-situ reaction hot-pressing sintering of boron carbide-based composite ceramics is as follows:

[0042] 1. Carry out vacuum induction melting (vacuum degree at 10 -2 Below Pa, the melting temperature is 1700°C, and the holding time is 10 minutes), cooled with the furnace, and solidified into an alloy block; titanium and silicon are composed of 35wt% titanium and 65wt% silicon.

[0043] 2. The alloy block obtained in step 1 is mechanically crushed, and then the crushed alloy is ground into a powder with an average particle size of less than 1mm by a grinding ballast, and then ball milled into an alloy powder with an average particle size of 20 μm.

[0044] 3. Mix the alloy powder obtained in step 2 with B 4 C powder (particle size 5 μm) was mixed by ball milling to obtain reaction sintering mixed powder. The mass ratio of boron carbide to sinterin...

Embodiment 3

[0045] Embodiment 3: the preparation of sintering aid

[0046] In this example, the preparation method of the sintering aid for in-situ reaction hot-pressing sintering of boron carbide-based composite ceramics is as follows:

[0047] 1. Melt the proportioned amount of titanium and silicon using non-consumable arc smelting equipment. During the smelting process, in order to make the alloy composition uniform, smelting is repeated five times; titanium and silicon are composed of: titanium 30wt%, silicon 70wt%.

[0048] 2. The alloy block obtained in step 1 is mechanically smashed, and then the smashed alloy is ground into a powder with an average particle size of less than 1mm by a grinding ballast, and then ball milled into an alloy powder with an average particle size of 10 μm.

[0049] 3. Mix the alloy powder obtained in step 2 with boron carbide powder (particle size 1 μm) and absolute ethanol by means of mechanical stirring and ultrasonic dispersion to obtain a reaction sint...

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Abstract

The invention discloses a boron carbide-based composite ceramic sintering aid and a sintering process, wherein the composition and ratio of the sintering aid are: 20-40 wt% of titanium and 60-80 wt% of silicon. The invention utilizes a vacuum hot-pressing sintering process to prepare boron carbide-based composite ceramics. When the sintering temperature is 1850°C, the holding time is 30min, the pressure is 30MPa, and the addition of sintering aids is 30wt%, the in-situ reaction hot-pressing sintered boron carbide The performance of matrix composite ceramics is better, the microhardness, bending strength, fracture toughness and compressive strength are 28.4GPa, 582MPa, 6.3MPa m 1 / 2 and 4109MPa. At a lower sintering temperature, a boron carbide-based composite ceramic with high density, wire-cutting processing, and good mechanical properties is obtained, which has high practical value.

Description

technical field [0001] The invention relates to a boron carbide-based composite ceramic sintering aid and a sintering process, belonging to the field of preparation of boron carbide ceramic-based composite materials. Background technique [0002] Boron carbide ceramics are attractive high-temperature functional-structural materials with excellent chemical and physical properties, such as good chemical stability, high hardness, low density, high melting point, and good wear resistance. Therefore, boron carbide has been used in a wide range of fields, such as bulletproof armor, refractory materials, abrasive coatings, electronics, etc. In addition, because boron has good neutron absorbing ability, boron carbide is also widely used as neutron absorber and shielding material in nuclear reactors. The poor sinterability and machinability of boron carbide ceramics, as well as its inherent brittleness, limit the practical application of boron carbide ceramics. Therefore, it is nece...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/645C04B35/65C04B35/563
CPCC04B35/563C04B35/645C04B35/65C04B2235/3813C04B2235/3826C04B2235/404C04B2235/428C04B2235/5436C04B2235/5445C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/96
Inventor 钟志宏杨安康王睿温群
Owner HEFEI UNIV OF TECH
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