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Zr2[Al(Si)]4C5-ZrB2-SiC composite material and preparation method thereof

A composite material, zirconium boride technology, applied in the field of ultra-high temperature resistant ceramics and its preparation, can solve the problems of single reinforcement and toughening mechanism, limited modification effect, etc., and achieve high strength and toughness

Active Publication Date: 2012-10-24
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, a strong and tough phase is used, the reinforcing and toughening mechanism is single, and the modification effect is limited

Method used

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  • Zr2[Al(Si)]4C5-ZrB2-SiC composite material and preparation method thereof
  • Zr2[Al(Si)]4C5-ZrB2-SiC composite material and preparation method thereof
  • Zr2[Al(Si)]4C5-ZrB2-SiC composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Molar ratio ZrH 2 :Al:Si:C:B 4 C=2:2.53:0.47:3.43:0.12 Weigh ZrH 2 Powder (-400 mesh), Al powder (-200 mesh), Si powder (-400 mesh), C powder (-1200 mesh), B 4 After C powder (10μm), dry mix it in a polyethylene tank for 10h, put it in a graphite mold, and cold press it under a pressure of 3-6MPa. The heating rate was increased to 1850°C for in-situ reaction hot-pressing sintering for 2 hours, and the hot-pressing pressure was 25MPa. Get Zr 2 [Al(Si)] 4 C 5 -10Vol.%(ZrB 2 +SiC) composite material, where ZrB 2 The volume fractions of ZrB and SiC are 7.5% and 2.5%, respectively, and the density of the obtained bulk material reaches 99.9%. ZrB 2 , SiC two reinforcing phases are uniformly dispersed in the Zr 2 [Al(Si)] 4 C 5 In the matrix. The size of zirconium aluminum silicon carbon-zirconium boride-silicon carbide composite material is 64mm×67mm×5.5mm.

Embodiment 2

[0019] Molar ratio ZrH 2 :Al:Si:C:B 4 C=2:2.60:0.64:3.54:0.28 Weigh ZrH 2 Powder (-400 mesh), Al powder (-200 mesh), Si powder (-400 mesh), C powder (-1200 mesh), B 4 After C powder (3μm), dry mix it in a polyethylene tank for 24 hours, put it in a graphite mold, and cold press it under a pressure of 3-6MPa. The heating rate was increased to 1900°C for in-situ reaction hot-pressing sintering for 1h, and the hot-pressing pressure was 30MPa. Get Zr 2 [Al(Si)] 4 C 5 -20Vol.%(ZrB 2 +SiC) composite material, where ZrB 2 The volume fractions of ZrB and SiC are 15% and 5%, respectively, and the density of the obtained bulk material reaches 99.9%. ZrB 2 , SiC two reinforcing phases are uniformly dispersed in the Zr 2 [Al(Si)] 4 C 5 In the matrix, the X-ray diffraction pattern of the composite material is as follows figure 1 shown. The size of zirconium aluminum silicon carbon-zirconium boride-silicon carbide composite material is 64mm×67mm×5.5mm.

Embodiment 3

[0021] Molar ratio ZrH 2 :Al:Si:C:B 4 C=2:2.15:0.70:2.92:0.40 Weigh ZrH 2Powder (-400 mesh), Al powder (-200 mesh), Si powder (-400 mesh), C powder (-1200 mesh), B 4 After C powder (3~10μm), dry mix it in a polyethylene tank for 24 hours, put it in a graphite mold, and cold press it under a pressure of 3-6MPa. The heating rate per minute was increased to 1850°C for in-situ reaction hot-pressing sintering for 1h, and the hot-pressing pressure was 30MPa. Get Zr 2 [Al(Si)] 4 C 5 -30Vol.%(ZrB 2 +SiC) composite material, where ZrB 2 The volume fractions of ZrB and SiC are 22.5% and 7.5%, respectively, and the density of the obtained bulk material reaches 99.9%. ZrB 2 , SiC two reinforcing phases are uniformly dispersed in the Zr 2 [Al(Si)] 4 C 5 In the matrix, the size of the zirconium aluminum silicon carbon-zirconium boride-silicon carbide composite material is 64mm×67mm×5.5mm. Corresponding X-ray diffraction patterns, scanning electron micrographs of polished surface...

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Abstract

The invention relates to super-high temperature resistant ceramic and a preparation method thereof, in particular to a Zr2[Al(Si)]4C5- ZrB2-SiC composite material and a preparation method thereof. The composite material is characterized by comprising a Zr2[Al(Si)]4C5 matrix and two reinforced phases of ZrB2 and SiC, wherein the ZrB2 accounts for 7.5-22.5 percent based on total volume of the material, and SiC accounts for 2.5-7.5 percent based on the total volume of the material. The preparation method comprises the following steps of: weighing ZrH2 powder, Al powder, C powder, graphite powder and B4C powder according to mole ratio of 2: (2.1-2.6): (0.47-0.71): (2.92-3.54): (0.12-0.41); uniformly mixing original materials for 10 to 24 hours by a physical mechanical method; loading into a graphite mold for cold press molding; heating in a hot pressing furnace which Argon gas is introduced and serves as a protective gas to 1800 to 1900 DEG C; and performing in-situ reaction and hot pressing sintering for 1 to 2 hours, wherein the sintering pressure is between 25 and 30MPa. The preparation method is simple, and the e performance of the material is excellent.

Description

technical field [0001] The invention relates to ultra-high temperature resistant ceramics and a preparation method thereof, and particularly provides a zirconium aluminum silicon carbon-zirconium boride-silicon carbide (Zr 2 [Al(Si)] 4 C 5 –ZrB 2 -SiC) composite material, and a method for preparing zirconium aluminum silicon carbon-zirconium boride-silicon carbide composite material by in-situ reaction hot pressing. Background technique [0002] Zirconium aluminum silicon carbide (Zr 2 [Al(Si)] 4 C 5 ) ceramics are new ultra-high temperature resistant multi-layered carbide ceramics (J.SolidState Chem. (Journal of Solid State Chemistry) 180 (2007) 1809; J.Am.Ceram.Soc. (American Ceramic Society Journal) (2009)). It combines the advantages of high modulus, high hardness, oxidation resistance, corrosion resistance, high electrical conductivity, strong damage tolerance, etc., and is widely used in high-tech fields such as aviation, aerospace, nuclear industry and ultra-hig...

Claims

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Application Information

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IPC IPC(8): C04B35/56C04B35/622
Inventor 杨建郭冬冬余磊丘泰
Owner NANJING UNIV OF TECH
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