Coated granatohedron tungsten-tungsten carbide composite material and preparation method thereof

A rhomboid dodecahedron and composite material technology, applied in the field of coated ultrafine tungsten carbide-tungsten particles and its preparation, to achieve the effect of promoting self-assembly arrangement, simple process control, and expanding application fields

Inactive Publication Date: 2010-12-29
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Coated granatohedron tungsten-tungsten carbide composite material and preparation method thereof
  • Coated granatohedron tungsten-tungsten carbide composite material and preparation method thereof
  • Coated granatohedron tungsten-tungsten carbide composite material and preparation method thereof

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Embodiment 1

[0031]Dissolve ammonium metatungstate in water to prepare a 15wt% solution, and oscillate ultrasonically for 30 minutes at room temperature; while stirring with a magnetic stirrer, introduce the solution into a spray dryer for spray drying. The spray drying conditions are: feed liquid The inlet flow rate is 30mL / min, the air inlet flow rate is 10L / min, the inlet temperature of the air nozzle is 180°C, and the temperature at the outlet of the tail gas is 90-100°C to obtain spherical ammonium metatungstate particle precursor; the dried precursor Put the body into a quartz boat and place it in a tube furnace. After passing through a 50°C water bath, the mixed gas of carbon monoxide and carbon dioxide is passed into the tube furnace for reduction carbonization. The temperature is raised to 900°C according to the 2°C / min program. The ratio is 9:1, the mixed gas flow rate is 300mL / min, and the reduction carbonization time is 12 hours. After the reaction was completed, the product wa...

Embodiment 2

[0033] Dissolve ammonium metatungstate in water to prepare a 15wt% solution, and oscillate ultrasonically for 30 minutes at room temperature; while stirring with a magnetic stirrer, introduce the solution into a spray dryer for spray drying. The spray drying conditions are: feed liquid The inlet flow rate is 30mL / min, the air inlet flow rate is 10L / min, the inlet temperature of the air nozzle is 180°C, and the temperature at the outlet of the tail gas is 90-100°C to obtain spherical ammonium metatungstate particle precursor; the dried precursor Put the body into a quartz boat and place it in a tube furnace, pass the mixed gas of carbon monoxide and carbon dioxide through a 20°C water bath, then pass it into the tube furnace for reduction carbonization, and increase the temperature to 800°C according to the 4°C / min program. The ratio is 3:1, the mixed gas flow rate is 300mL / min, and the reduction carbonization time is 9 hours. After the reaction was completed, the product was c...

Embodiment 3

[0035] Dissolve ammonium metatungstate in water to prepare a 15wt% solution, and oscillate ultrasonically for 30 minutes at room temperature; while stirring with a magnetic stirrer, introduce the solution into a spray dryer for spray drying. The spray drying conditions are: feed liquid The inlet flow rate is 30mL / min, the air inlet flow rate is 10L / min, the inlet temperature of the air nozzle is 180°C, and the temperature at the outlet of the tail gas is 90-100°C to obtain spherical ammonium metatungstate particle precursor; the dried precursor Put the body into a quartz boat and place it in a tube furnace. After the mixed gas of methane and hydrogen passes through a 30°C water bath, it is passed into the tube furnace for reduction and carbonization. The temperature is raised to 800°C according to the 2°C / min program. The ratio is 18:1, the mixed gas flow rate is 220mL / min, and the reduction carbonization time is 10 hours. After completion of the reaction, the product was cool...

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Abstract

The invention discloses a coated granatohedron tungsten-tungsten carbide composite material and a preparation method thereof. The tungsten-tungsten carbide composite material is in a tungsten-tungsten carbide coated core shell structure adopting tungsten carbide as a shell and tungsten as a core. The tungsten-tungsten carbide composite material has the features of a granatohedron, and the particle size thereof is 1-4mum. The composite material is simple to prepare, and the particle size distribution of the prepared granatohedron is less than 4mum, therefore, the heat stability is greatly improved.

Description

(1) Technical field [0001] The invention relates to a tungsten carbide-tungsten material and a preparation method thereof, in particular to coated ultrafine tungsten carbide-tungsten particles with a rhombic dodecahedron structure and a preparation method thereof. (2) Background technology [0002] Tungsten is a non-ferrous metal and an important strategic metal. Tungsten has the characteristics of high melting point and low vapor pressure, so that it has relatively stable chemical properties and does not react with air and water at room temperature. Tungsten is widely used in modern technology in pure metal state and alloy state. The most important alloy state is alloy steel, hard alloy based on tungsten carbide, wear-resistant alloy and strong heat alloy. However, in terms of hardness and oxidation resistance, tungsten is still not as good as tungsten carbide. For example, existing research reports have shown that the preparation of double-layer or multi-layer tungsten c...

Claims

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Application Information

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IPC IPC(8): B01J13/04
Inventor 马淳安陈赵扬赵峰鸣
Owner ZHEJIANG UNIV OF TECH
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