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Ti-enhanced B4C/SiC multiphase ceramic

A technology of composite phase ceramics and powder, which is applied in the field of Ti-enhanced B4C/SiC composite phase ceramics, which can solve the problems of poor wettability between metal phase and ceramic phase, failure to obtain finished products, and inability to form uniform and stable products, so as to optimize the phase composition , promote the sintering and densification process, and the effect of compact microstructure

Inactive Publication Date: 2017-08-15
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main research work is concentrated on the composite materials of Fe, Cu, Mg, Ti, Al and other metals and boron carbide. The preparation temperature is usually 1000 °C, but due to the poor wettability of the metal phase and the ceramic phase, it is impossible to form a unified and stable composite material. structure, so that it is impossible to obtain a stable finished product

Method used

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  • Ti-enhanced B4C/SiC multiphase ceramic
  • Ti-enhanced B4C/SiC multiphase ceramic
  • Ti-enhanced B4C/SiC multiphase ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step 1. Combine Ti powder, SiC powder, B 4 C powder, PEG4000 and absolute ethanol are mixed according to the mass ratio of 1:1.5:2.5:0.1:20 and moved into the PTFE ball mill tank, and then added into the ball milling medium ZrO according to the ball-to-material ratio of 4:1 2 Balls, and then ball milled at a speed of 150r / min for 48 hours, and then dried the mixed slurry in a vacuum oven at 80°C for 8 hours to obtain a complex powder;

[0035] Step 2. Put the multiphase powder obtained in step 1 in a vacuum hot-pressing sintering furnace until the vacuum degree reaches 6.63×10 - 3 Pa, sintering at a sintering temperature of 1950°C and a sintering pressure of 30MPa for 2 hours, and cooling with the furnace to obtain Ti-enhanced B 4 C / SiC composite ceramics.

[0036] Characterize the composite ceramics prepared in this example: the measured relative density is 98.7%, the microhardness is 40.7GPa, the flexural strength is 576.7MPa, and the fracture toughness is 5.41MPa ...

Embodiment 2

[0040] Step 1. Combine Ti powder, SiC powder, B 4 C powder, PEG4000 and absolute ethanol are mixed according to the mass ratio of 0.5:1.5:2.5:0.1:20 and moved into the PTFE ball milling tank, and then the ball milling medium ZrO is added according to the ball material ratio of 4:1 2 Balls, and then ball milled at a speed of 200r / min for 24 hours, and then dried the mixed slurry in a vacuum oven at 80°C for 8 hours to obtain a complex powder;

[0041] Step 2. Put the multiphase powder obtained in step 1 in a vacuum hot-pressing sintering furnace until the vacuum degree reaches 6.63×10 - 3 Pa, sintering at a sintering temperature of 1950°C and a sintering pressure of 30MPa for 2 hours, and cooling with the furnace to obtain Ti-enhanced B 4 C / SiC composite ceramics.

[0042] Characterize the composite ceramics prepared in this example: the measured relative density is 97.9%, the microhardness is 38.1GPa, the flexural strength is 495.2MPa, and the fracture toughness is 5.13MPa ...

Embodiment 3

[0044] Step 1. Combine Ti powder, SiC powder, B 4 C powder, PEG4000 and absolute ethanol are mixed according to the mass ratio of 1:1.5:2.5:0.1:20 and moved into the PTFE ball mill tank, and then added into the ball milling medium according to the ball-to-material ratio of 4:1 ZrO 2 Balls, and then ball milled at a speed of 150r / min for 48 hours, and then dried the mixed slurry in a vacuum oven at 80°C for 8 hours to obtain a complex powder;

[0045] Step 2. Put the multiphase powder obtained in step 1 in a vacuum hot-pressing sintering furnace until the vacuum degree reaches 6.63×10 - 3 Pa, sintering at a sintering temperature of 1800°C and a sintering pressure of 20MPa for 1h, and cooling with the furnace to obtain Ti-enhanced B 4 C / SiC composite ceramics.

[0046] Characterize the composite ceramics prepared in this example: the measured relative density is 97.4%, the microhardness is 37.5GPa, the flexural strength is 486.2MPa, and the fracture toughness is 4.96MPa m 1...

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Abstract

The invention relates to a Ti-enhanced B4C / SiC multiphase ceramic, which belongs to the technical field of a metal particles-enhanced ceramic composite material. In the Ti-enhanced B4C / SiC multiphase ceramic, Ti and B4C are subjected to an interface reaction to generate a TiB2 phase, optimization of object phase composition is realized, crystal grain refinement effect is realized, and mechanical properties of the multiphase ceramic can be increased; a lot of liquid phase is generated during a vacuum hot pressed sintering of Ti, sintering and densifying processes of the multiphase ceramic can be promoted, the microstructure of the prepared multiphase ceramic is compact; in addition, the multiphase ceramic has a transgranular fracture and intergranular fracture-coexisted mixing fracture mode, so that the fracture toughness property of the multiphase ceramic is increased.

Description

technical field [0001] The present invention relates to a kind of Ti enhanced B 4 A C / SiC composite ceramic belongs to the technical field of metal particle reinforced ceramic composite materials. Background technique [0002] B 4 C ceramics are widely used as structural materials due to their low density, high hardness and corrosion resistance. Research and experiments have found that in B 4 Adding second phases such as oxides, activated carbon, borides, carbides and metal elements to C can effectively improve B 4 The sintering performance and mechanical properties of C products, compared with pure boron carbide, can obtain a multi-phase ceramic material with higher density at a lower sintering temperature. [0003] The current study found that when the B in the ceramic matrix composite 4 When the content of C phase is higher than that of SiC phase, dense B 2 o 3 The glass phase, which isolates the inward transmission of oxygen and heat, has excellent high-temperatur...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/565C04B35/563C04B35/52C04B35/622
CPCC04B35/52C04B35/563C04B35/565C04B35/58071C04B35/622C04B2235/404C04B2235/5436C04B2235/656C04B2235/6581
Inventor 李云凯吴超程兴旺张朝晖陈义文
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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