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High-compactness boron carbide composite ceramic material preparation method

A technology of composite ceramics and boron carbide, which is applied in the field of preparation of boron carbide composite ceramic materials, can solve problems such as unclear function, large shrinkage, and heavy loss of green body

Active Publication Date: 2016-03-02
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with this formulation, TiB 2 All made of TiO 2 Transformation, a large amount of gas is released during the sintering process, the green body loses weight and shrinks greatly, and the sample is prone to cracking and deformation
[0007] In addition, the Chinese invention patent with the application number 201210267777.5 discloses a kind of sintering and densification of boron carbide when using chromium carbide as a sintering aid and utilizing the liquid phase chromium boride generated by it. Although it also generally mentions that titanium oxide, titanium oxide, and Chromium oxide is used as a sintering aid, but no substantive examples are given, and the role of titanium oxide and chromium oxide is not clear

Method used

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preparation example Construction

[0030] The invention belongs to the field of preparation of special materials, and in particular relates to a method for preparing a boron carbide composite ceramic material. The formula contains the following raw materials in parts by weight: 100 parts of boron carbide powder; 20-50 parts of boride powder, 1-20 parts of transition metal carbide, preferably the content of the boride powder in the raw material powder is 20- 40 parts; 1-20 parts of transition metal oxide powder, preferably 2-6 parts; and according to the reduction reaction of transition metals, add carbon or precursor substances that can generate carbon, generally 1-15 parts, preferably The amount of addition should be determined according to calculation and experimental results; wherein: the average particle size of boron carbide powder is 0.1-3.0 microns, preferably 0.5-1 microns; the particle size of transition metal boride powders is 0.1-10 microns, preferably 1-5 microns. The above raw materials are mixed ...

Embodiment 1

[0048] Boron carbide powder 300 grams, average particle size 0.5 micron, titanium boride powder (d 50 =1μm) 90 grams, titanium oxide powder (d 50 =0.3 μm) 20 grams, 10 grams of carbon black powder, add 250 grams of absolute ethanol, ball mill for 2 hours, add 20 parts of 10% PVB aqueous solution, continue ball milling for 1 hour, dry, and pass through a 120 mesh sieve. The above-mentioned mixed powder is pressed into a 6×8×45mm test strip, sintered under the pressure of 0.01MPa argon gas, the holding temperature is 2120°C, and the holding time is 1 hour. Material density 2.70g / cm 3 (relative density 97%), strength 420MPa, hardness 33GPa, toughness 4.5MPa m 1 / 2 ;

[0049] Figure 1a with Figure 1b The XRD patterns of the raw material powder and the prepared boron carbide composite ceramic material in Example 1 are shown respectively, and it can be seen from the figure that the components of the raw material are indeed composited to form ceramics after sintering.

Embodiment 2

[0053] 300 grams of boron carbide powder, average particle size 0.5 micron, vanadium boride powder (d 50 =1μm) 90 grams, titanium carbide powder (d 50 =2μm) 20 grams, zirconia powder (d 50 =1 μm) 20 grams, 10 grams of carbon black powder, add 300 grams of water, ball mill 2 hours, add 12 parts of 8% PVA (polyvinyl alcohol) aqueous solution, continue ball mill 1 hour, dry, cross 120 mesh sieves. The above-mentioned mixed powder is pressed into a test bar of 6×8×45 mm, sintered under vacuum condition, the holding temperature is 2100° C., and the holding time is 1 hour. Material density 2.75g / cm 3 , strength 410MPa, hardness 32GPa, toughness 4.9MPa m 1 / 2 .

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Abstract

The invention relates to a high-compactness boron carbide composite ceramic material preparation method, which comprises: 1) preparing uniformly-mixed raw material powder, wherein the raw material powder comprises boron carbide powder, transition metal boride powder, transition metal oxide powder, carbon and / or a carbon precursor substance; and 2) preparing the biscuit of a boron carbide composite ceramic material from the raw material powder prepared in the step 1), and sintering the biscuit at a temperature of 2000-2150 DEG C in a vacuum or inert atmosphere to obtain the boron carbide composite ceramic material.

Description

technical field [0001] The invention belongs to the field of preparation of special materials, and in particular relates to a method for preparing a boron carbide composite ceramic material. Background technique [0002] Boron carbide is a compound with strong covalent bonds. Boron carbide ceramics have high hardness, but the material density is low, only 2.52g / cm 3 . The above excellent properties make boron carbide ceramics have a wide range of uses, and its application is also subject to many restrictions. The most important points are two points. One is that it is difficult to densify. Generally, it is necessary to obtain higher density materials by hot pressing and sintering. Materials and materials The cost of components is high; the other is the low toughness of boron carbide ceramics, which affects its performance to a certain extent. [0003] US Patent US4,195,066 and British Patent GB2,014,193 propose that boron carbide ceramics can be prepared by pressureless s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/622
Inventor 张兆泉董满江钱鹏翔顾辉
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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