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Zirconium carbide-zirconium diboride complex-phase ceramic powder synthesized through thermal explosion and preparation method thereof

A technology of zirconium diboride and composite ceramics, which is applied in the field of boride composite ceramic powder materials and transition metal carbides, can solve problems such as low activity, uneven carbonization, and large particle size of zirconium diboride powder, and achieve The effect of simple process, rapid response and high degree of product compounding

Inactive Publication Date: 2017-02-22
TONGREN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the zirconium diboride powder prepared by these methods has large particle size, low activity, and is difficult to sinter, and the high-purity ultrafine powder is difficult to synthesize in large quantities, which limits its wide application.
[0004] Due to the production and preparation process of traditional zirconium carbide and zirconium diboride, it is easy to cause uneven carbonization, low purity, and poor sintering performance, which seriously restricts its performance as hard strengthening particles and affects the development and application of non-ferrous metal materials. , hindering the development of my country's powder metallurgy industry

Method used

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  • Zirconium carbide-zirconium diboride complex-phase ceramic powder synthesized through thermal explosion and preparation method thereof
  • Zirconium carbide-zirconium diboride complex-phase ceramic powder synthesized through thermal explosion and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] Example 1: Zr-B 4 C system

[0031] For Zr-B 4 System C consists of the following components by mole percentage: Zr powder 75mol.%, B 4C powder 25mol.%, the molar ratio of the two is 3:1, and the sum of the molar percentages is 100mol.%. Zr powder and B 4 Weigh 16.0 grams of powder C according to a molar ratio of 3:1 and mix them evenly, then press and form a cylindrical green body under a pressure of 35-40 MPa, with a diameter of 20 mm, a thickness of 15 mm, and a relative density of 65 ± 3%. Then put the compact 3 into the graphite crucible 2, and then place one piece in the reaction chamber 1 of the induction furnace, first evacuate it and then fill it with Ar gas for protection, switch on the SIT high-frequency power supply 4, within 20-25s Adjust the voltage applied by the high-frequency induction furnace to increase from 0 to 65 volts (the current will increase accordingly from 0 to 45 amps). At this time, the overall reaction of the agglomerate will be ignite...

Embodiment 2

[0033] Embodiment 2: 10wt.% Al-Zr-B4C system

[0034] For 10wt.% Al-Zr-B 4 C system, the raw materials are composed of the following components according to mass percentage: Al powder 10wt.%, Zr powder and B 4 A total of 90wt.% of C powder, of which Zr powder, B 4 C powder according to Zr:B 4 The molar ratio of C=3:1 is prepared, and the sum of the mass percentages of the three components is 100%. Al powder, Zr powder and B 4 C powder is weighed according to this component ratio, in which Zr powder and B 4 The molar ratio of C powder is 3:1, the total weight is 15.7 grams and mixed evenly, and the cylindrical green body is pressed under a pressure of 35-40 MPa, with a diameter of 20 mm, a thickness of 15 mm, and a relative density of 65 ± 3%. Then put the compact 3 into the graphite crucible 2, and then place one piece in the reaction chamber 1 of the induction furnace, first evacuate it and then fill it with Ar gas for protection, switch on the SIT high-frequency power s...

Embodiment 3

[0036] Embodiment 3: 20wt.% Al-Zr-B4C system

[0037] For 20wt.% Al-Zr-B 4 C system, the raw materials are composed of the following components according to mass percentage: Al powder 20wt.%, Zr powder and B 4 A total of 80wt.% of C powder, of which Zr powder, B 4 C powder according to Zr:B 4 The molar ratio of C=3:1 is prepared, and the sum of the mass percentages of the three components is 100%. Al powder, Zr powder and B 4 C powder is weighed according to this component ratio, in which Zr powder and B 4 The molar ratio of C powder is 3:1, the total weight is 15.4 grams and mixed evenly, and the cylindrical green body is pressed under a pressure of 35-40 MPa, with a diameter of 20 mm, a thickness of 15 mm, and a relative density of 65 ± 3%. Then put the compact 3 into the graphite crucible 2, and then place one piece in the reaction chamber 1 of the induction furnace, first evacuate it and then fill it with Ar gas for protection, switch on the SIT high-frequency power s...

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Abstract

The invention relates to zirconium carbide-zirconium diboride complex-phase ceramic powder synthesized through thermal explosion and a preparation method thereof. The ceramic powder is prepared from, by mass, 0%-30% of Al powder and 70%-100% of Zr powder and B4C powder, wherein the molar ratio of Zr to B4C is 3:1, and the sum of the mass percent of the components is 100%. The preparation method comprises the steps that the Al powder, the Zr powder and the B4C powder which are dried are fully mixed and then pressed into green blank blocks, a thermal explosion chemical reaction is conducted in an induction furnace which is vacuumized and then is full of Ar gas, and the ceramic powder is obtained. The ceramic powder and the preparation method thereof have the advantages that reacting is rapid, energy saving and cleanliness are achieved, and the product compounding degree is high; the product is a ceramic compound mainly containing ZrC powder and ZrB2 powder and can be directly applied as a zirconium carbide-zirconium diboride complex-phase ceramic powder material, the zirconium carbide-zirconium diboride complex-phase ceramic powder can be separated after other impurities in the compound are washed off through extraction, and then the single pure zirconium carbide or pure zirconium diboride ceramic powder can be obtained for application.

Description

technical field [0001] The invention belongs to the technical field of new transition metal carbide and boride composite ceramic powder materials, and specifically relates to a zirconium carbide and zirconium diboride composite ceramic powder synthesized by high-frequency induction thermal explosion under a protective atmosphere and a preparation method thereof . Background technique [0002] Zirconium carbide (ZrC) has stable chemical and physical properties, extremely high melting point and hardness, excellent wear resistance and corrosion resistance, good chemical stability and certain metal conductivity and thermal conductivity, so it is widely used in cutting tools, resistance Grinding drill bits, electronic components, protective layers in atomic reactors, etc. As a strengthening phase, ZrC is more used as reinforcing particles in metal matrix composites. ZrC has a typical face-centered cubic structure with comprehensive composite properties of metal bonds, ionic bon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/56C04B35/65C04B35/626
CPCC04B35/58078C04B35/5622C04B35/626C04B35/65C04B2235/3821C04B2235/402C04B2235/404
Inventor 宋谋胜李勇张杰张东方
Owner TONGREN UNIV
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