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Boron carbide/carbon composite material with controllable boron carbide structure and preparation method and application thereof

A carbon composite material and boron carbide technology, applied in the field of ceramic materials, can solve the problems of low toughness, easy fracture, and high brittleness of boron carbide ceramics, achieve good material hardness and toughness, speed up production cycle, and reduce production costs.

Active Publication Date: 2021-12-17
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Boron carbide ceramics usually have the problems of high brittleness, easy fracture and low toughness

Method used

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  • Boron carbide/carbon composite material with controllable boron carbide structure and preparation method and application thereof
  • Boron carbide/carbon composite material with controllable boron carbide structure and preparation method and application thereof
  • Boron carbide/carbon composite material with controllable boron carbide structure and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The boron carbide powder and the yttrium oxide additive are fully mixed according to the mass ratio of 95:5, and then put into a stainless steel mold for cold pressing, the pressure is 20MPa, and the holding time is 1min. The cold-pressed block was packaged in a graphite tank, and then the graphite tank was packaged in a corundum ark, and the temperature was raised to 1550 °C at a rate of 3 °C / min using a muffle furnace, and then kept for 2 hours. After cooling down to normal temperature, the microscopic confocal Raman spectrum of the bulk material in the graphite tank was measured.

[0049] like Figure 5 As shown, the relative ratio of Raman peak intensities of triatomic chain stretching vibration, icosahedral rocking vibration, icosahedral breathing vibration, D peak and G peak is 0.61:0.38:1.00:2.16:1.75. and figure 2 Compared with the boron carbide powder without high temperature treatment, Figure 5 The relative peak intensity ratios of triatomic chain stretch...

Embodiment 2

[0053] The boron carbide powder and the barium titanate additive are fully mixed according to the mass ratio of 95:5, and then put into a stainless steel mold for cold pressing, the pressure is 20MPa, and the holding time is 1min. The cold-pressed block was packaged in a graphite tank, and then the graphite tank was packaged in a corundum ark, and the temperature was raised to 1550 °C at a rate of 3 °C / min using a muffle furnace, and then kept for 2 hours. After cooling down to normal temperature, the microscopic confocal Raman spectrum of the bulk material in the graphite tank was measured.

[0054] like Figure 7 As shown, the relative ratios of the Raman peak intensities of the three-atom chain stretching vibration, icosahedral rocking vibration, icosahedral breathing vibration, D peak and G peak are 0.58:0.35:1.00:1.62:1.14. and figure 2 Compared with the boron carbide powder, Figure 7 The relative peak intensity ratios of triatomic chain stretching and icosahedral sw...

Embodiment 3

[0057] After the boron carbide powder and magnesium oxide additive are fully mixed according to the mass ratio of 95:5, they are put into a stainless steel mold for cold pressing, the pressure is 20MPa, and the pressure holding time is 1min. The cold-pressed block was packaged in a graphite tank, and then the graphite tank was packaged in a corundum ark, and the temperature was raised to 1550 °C at a rate of 3 °C / min using a muffle furnace, and then kept for 2 hours. After cooling down to normal temperature, the microscopic confocal Raman spectrum of the bulk material in the graphite tank was measured.

[0058] like Figure 8 As shown, the relative ratio of the Raman peak intensities of the triatomic chain stretching vibration, icosahedral rocking vibration, icosahedral breathing vibration, D peak and G peak is 0.82:0.41:1.00:3.74:2.02. and figure 2 Compared with the boron carbide powder, Figure 8 The relative peak intensities of triatomic chain stretching and icosahedral...

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Abstract

The invention relates to a boron carbide structure regulation and control method and a boron carbide / carbon composite material preparation method, and belongs to the technical field of ceramic materials. The preparation method comprises the following steps: fully mixing boron carbide powder and auxiliary agent powder, performing pressure forming, and sintering at the sintering temperature of 1000-1600 DEG C to obtain the boron carbide / carbon composite material. The relative proportion of a boron carbide triatomic chain to an icosahedron structure is regulated and controlled by controlling the types of added auxiliary agents, and the auxiliary agents are one or more of Y2O3, BaTiO3, MgO, Fe3O4 and Al2O3. According to the preparation method, the boron carbide / carbon composite material is prepared, and the strength of a D peak and a G peak of carbon is regulated and controlled, so that the composite material has better material hardness and toughness performance, good thermal shock resistance of carbon is combined with good high-temperature plasma scouring resistance of boron carbide, the production period of material preparation is greatly shortened, the production cost is reduced, and the application prospect of the boron carbide composite material is expanded.

Description

technical field [0001] The invention relates to boron carbide structure regulation and boron carbide / carbon composite material preparation technology, and belongs to the technical field of ceramic materials. Background technique [0002] Boron carbide has the characteristics of high hardness, low density, high temperature resistance, corrosion resistance, and neutron radiation absorption, and is a high-temperature semiconductor material with excellent performance. It is widely used in aerospace, nuclear industry, light armor, electronics and other fields. [0003] Boron carbide ceramics usually have the problems of high brittleness, easy fracture and low toughness. The preparation of boron carbide / carbon composite materials avoids the excessive growth of boron carbide grains at the microscopic level, which not only improves the toughness of the material, but also improves the electrical conductivity, so that the boron carbide-carbon composite materials have dual characterist...

Claims

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Application Information

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IPC IPC(8): C04B35/563C04B35/52C04B35/622C04B35/63
CPCC04B35/563C04B35/52C04B35/622C04B35/6303C04B2235/3225C04B2235/3236C04B2235/3206C04B2235/3217C04B2235/3272C04B2235/5454
Inventor 于迎涛黄佳瑩张学翰韩皓璇
Owner DALIAN MARITIME UNIVERSITY
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