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Texturing boride-based ceramics and preparing method thereof

A boride and texturing technology, applied in the field of structural ceramic materials, can solve problems such as difficulty in texturing

Active Publication Date: 2010-07-07
中科西卡思(苏州)科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

MB 2 The particle morphology of the powder is usually equiaxed, so it is very difficult to achieve its texturing by the first two methods mentioned above

Method used

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  • Texturing boride-based ceramics and preparing method thereof
  • Texturing boride-based ceramics and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Preparation of single-phase HfB 2 Textured ceramics. First, weigh 0.3g PEI (dispersant) in a beaker, then add 2.4ml deionized water into it, ultrasonically treat for 10min, and adjust the pH to 6.5; weigh HfB 2 Powder (purity: 93%, d 50 = 10 μm) 21.6g, slowly added to the above solution, defoaming under vacuum after ball milling for 24 hours; then in a strong magnetic field of 12T, use the above slurry to form the slurry; after solidification, the green body is taken out from the magnetic field and dried. Then debinding under vacuum at 700°C for 2h; SPS sintering the green body at 1800°C / 50MPa. Material density reaches 97%, HfB 2 The Lotgering orientation factor f(00l) of the grain along the direction is 0.86, perpendicular to the plane, the hardness is 25GPa, and the toughness is 5.9MPa m 1 / 2 ; Parallel to the plane , the hardness is 19GPa, and the toughness is 4.1MPa·m 1 / 2 . figure 1 (a) shows the XRD diffraction patterns of ceramics in two directions perpendi...

Embodiment 2

[0021] Preparation of HfB 2 - 5vol% SiC textured ceramics. Measure 3.0ml of deionized water with a measuring cylinder, add PEI (dispersant) 0.3g to it, weigh HfB 2 Powder (purity: 90%, d 50 =8μm) 20.52g, β-SiC (purity: 98%, d 50 =10μm) 0.32g, according to the method of Example 1, SPS sintering at 1900°C / 30MPa. Material density reaches 97%, HfB 2The Lotgering orientation factor f(00l) of the grain along the direction is 0.91, perpendicular to the plane, the hardness is 25GPa, and the toughness is 6.1MPa m 1 / 2 ; Parallel to the plane , the hardness is 18GPa, and the toughness is 4.1MPa·m 1 / 2 .

Embodiment 3

[0023] Preparation of HfB 2 - 10vol% SiC textured ceramic. Measure 4.5ml of deionized water with a measuring cylinder, add PEI (dispersant) 0.1g to it, weigh HfB 2 Powder (purity: 92%, d 50 =2μm) 19.44g, β-SiC (purity: 91%, d 50 =5μm) 0.63g, according to the method of Example 1, hot-pressing sintering (HP) at 1900°C / 30MPa. Material density reaches 97%, HfB 2 The Lotgering orientation factor f(00l) of the grain along the direction is 0.93, perpendicular to the plane, the hardness is 24GPa, and the toughness is 6.2MPa m 1 / 2 ; Parallel to the plane , the hardness is 19GPa, and the toughness is 4.2MPa·m 1 / 2 .

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Abstract

The present invention relates to texturing boride-based ceramics and a preparing method thereof, which belongs to the field of structural ceramics material. MB2 powder is used as raw material powder in the present invention (M is Ti or Zr or Hf), and 0 to 40 wt% of beta-SIC powder is fed into the raw material powder. Polymine or acrylic copolymer is used as dispersant to be fed into water to formwater solution. The pH value of sizing agent water solution is adjusted to between 6.5 and 9, the raw material powder is mixed with the sizing agent water solution, and the mixture is defoamed. After sizing agent is casted to be solidified in the magnetic field of 10 to 30 T, the sizing agent is processed under the temperature of 500 to 700 DEG C. hot-press or discharging plasma sintering is used. Compact ceramics of which the relative density is larger than 97% is obtained by the present invention. Ceramics grains are arranged along the height orientation of (001) direction, Loterring orientation factor f(001) is larger than 0.85, and the mechanical property and the antioxygenic property appear obvious anisotropism.

Description

technical field [0001] The invention relates to a textured boride-based ceramic and a preparation method thereof, belonging to the field of structural ceramic materials. Background technique [0002] Boride-based (MB2-based) materials are considered to be one of the most promising candidates in this field because of their high melting point, high thermal conductivity, high chemical stability, and good mechanical properties [M.M.Opeka, I.G.Talmy, E.J. Wuchina, J.A.Zaykoski, and S.J.Causey, "Mechanical, thermal, and oxidation properties of refractory hafnium and zirconium compounds", J.Eur.Ceram.Soc., 19[13-14]2405-14(1999)]. In order to improve the performance of boride-based materials, most of the current research focuses on the composition design of materials, that is, to change the composition of materials by selecting different additives to improve the performance of materials. Different from component design, to prepare textured ceramics with highly oriented grains, des...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/622
Inventor 张国军倪德伟阚艳梅王佩玲
Owner 中科西卡思(苏州)科技发展有限公司
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