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Laminar Ti/B4C composite material and preparation method thereof

A composite material and layered technology, applied in the field of layered Ti/B4C composite material and its preparation, can solve problems such as crack deflection and influence on Ti, and achieve the effect of relatively high porosity, easy operation and good industrial application prospects.

Inactive Publication Date: 2017-09-01
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that Ti is easy to react with ceramic materials in the prior art, thereby affecting the performance of Ti-enhanced ceramic composite materials, one of the purposes of the present invention is to provide a layered Ti / B 4 C composite material, the composite material is made of Ti toughening layer and B 4 C strength layers are stacked alternately, Ti layers and B 4 The C interlayer will cause crack deflection during fracture, so that the composite material has excellent fracture toughness

Method used

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  • Laminar Ti/B4C composite material and preparation method thereof
  • Laminar Ti/B4C composite material and preparation method thereof
  • Laminar Ti/B4C composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] (1) Add 50g of titanium powder, 3g of aluminum powder, 400mL of absolute ethanol and 0.5g of polyethylene glycol (molecular weight 4000) into the ball mill jar, and then add ZrO at a ball-to-material ratio of 10:1 2 Balls, and then ball milled at a speed of 150r / min for 12 hours, and then the uniformly mixed slurry after ball milling was dried in a vacuum oven at 80°C for 8 hours to obtain Al / Ti mixed powder;

[0039](2) Using polyvinyl alcohol as the binder, under the pressure of 30MPa, Al / Ti mixed powder, B 4 The C powder was dry-pressed, and after holding the pressure for 10 minutes, a Ti flake with a thickness of 0.2 mm and Al doped and a B sheet with a thickness of 0.4 mm were obtained. 4 C flakes, Ti flakes and B 4 C flakes are stacked alternately in sequence to obtain layered Ti / B 4 C composite material green body;

[0040] (3) layered Ti / B 4 The green body of C composite material is placed in a vacuum hot-pressing sintering furnace, and the vacuum degree rea...

Embodiment 2

[0043] (1) Add 50g of titanium powder, 2g of aluminum powder, 400mL of absolute ethanol and 0.5g of polyethylene glycol (molecular weight 4000) into the ball mill jar, and then add ZrO at a ball-to-material ratio of 10:1 2 Balls, and then ball milled at a speed of 150r / min for 12 hours, and then the uniformly mixed slurry after ball milling was dried in a vacuum oven at 80°C for 8 hours to obtain Al / Ti mixed powder;

[0044] (2) Using polyvinyl alcohol as a binder, under a pressure of 10MPa, Al / Ti mixed powder, B 4 The C powder was dry-pressed, and after holding the pressure for 5 minutes, a Ti flake with a thickness of 0.4 mm and Al doped and a B sheet with a thickness of 0.8 mm were obtained. 4 C flakes, Ti flakes and B 4 C flakes are stacked alternately in sequence to obtain layered Ti / B 4 C composite material green body;

[0045] (3) layered Ti / B 4 The green body of C composite material is placed in a vacuum hot-pressing sintering furnace, and the vacuum degree reaches...

Embodiment 3

[0048] (1) Add 50g of titanium powder, 3g of aluminum powder, 400mL of absolute ethanol and 0.5g of polyethylene glycol (molecular weight 4000) into the ball mill jar, and then add ZrO at a ball-to-material ratio of 10:1 2 Balls, and then ball milled at a speed of 150r / min for 12 hours, and then the uniformly mixed slurry after ball milling was dried in a vacuum oven at 80°C for 8 hours to obtain Al / Ti mixed powder;

[0049] (2) Using polyvinyl alcohol as the binder, under the pressure of 20MPa, Al / Ti mixed powder, B 4 The C powder was dry-pressed, and after holding the pressure for 8 minutes, a Ti flake with a thickness of 0.4 mm and doped with Al and a B sheet with a thickness of 0.8 mm were obtained. 4 C flakes, Ti flakes and B 4 C flakes are stacked alternately in sequence to obtain layered Ti / B 4 C composite material green body;

[0050] (3) layered Ti / B 4 The green body of C composite material is placed in a vacuum hot-pressing sintering furnace, and the vacuum degre...

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Abstract

The invention relates to a laminar Ti / B4C composite material and a preparation method thereof, and belongs to the technical field of metal enhanced ceramic composite materials. The composite material is formed by alternately overlying a Ti layer and a B4C layer in sequence; Ti and B4C have different thermal expansion coefficients and elastic modulus, so that cracks deflect when the cracks are extended in the composite material, fracture energy is gradually consumed, and the fracture toughness of the composite material is easy to improve; furthermore, less Al is added, and the interface strength can be improved, so that the mechanical properties of the composite material are improved; moreover, the interface reaction extent between the Ti layer and the B4C layer is reduced by utilizing a surface contact manner of particles between the Ti layer and the B4C layer. The method provided by the invention has a simple process, is easy to operate and has a very good industrial application prospect; the prepared laminar Ti / B4C composite material has a good microscopic structure, relatively low porosity and good mechanical properties.

Description

technical field [0001] The invention relates to a layered Ti / B 4 A C composite material and a preparation method thereof belong to the technical field of metal reinforced ceramic composite materials. Background technique [0002] B 4 C ceramics have a low density (2.52g / cm 3 ), high hardness (27.5GPa~49.5GPa), high wear resistance, strong chemical stability and excellent neutron absorption, etc., have been widely studied in recent years and gradually applied to protective armor, engineering structural parts and nuclear industry, etc. field. However, since B 4 The covalent bond content of C reaches 93.94%, which leads to higher sintering temperature and poorer fracture toughness than other ceramic materials, which severely limits the wide application of boron carbide ceramics in engineering and military fields. [0003] Layered ceramic matrix composites were first proposed in the journal Nature in 1990 (Clegg W J, Kendall K, Alford N M, et al.A simple way to make tough c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/76C04B35/563C04B35/622
CPCC04B35/563C04B35/622C04B35/76C04B2235/404C04B2235/5436C04B2235/77C04B2235/96
Inventor 李云凯吴超程兴旺张朝晖陈义文
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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