Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for zirconium carbide powder reduction synthesis by magnesium thermal combustion

A technology of zirconium carbide powder and magnesia heating is applied in the field of refractory compounds and their solid-phase synthesis, which can solve the problems of restricting large-scale development and application, coarse grains of zirconium carbide and incapability of large-scale production, etc. The effect of fast response and low cost

Inactive Publication Date: 2012-07-04
WUHAN UNIV OF TECH
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high price of high-purity ZrC raw materials limits the large-scale development and application of such materials.
[0003] The traditional synthesis process of zirconium carbide ceramic powder is: put the mixture of zirconia and carbon in a vacuum tube furnace by carbothermal reduction method, heat it to about 1500°C for carbonization reduction, and the reduction time is generally 1 to 12 hours. The mixing method is simple, only mixing on a coarser particle size, so the particle size of the synthesized powder is larger, and the sintering activity is poor
The main disadvantages of this method: complex production equipment, high reaction temperature, long time, huge energy consumption, coarse grains of zirconium carbide obtained, poor product purity
The main disadvantages of this method are: long production cycle, complicated operation, incapable of large-scale production, and many influencing factors

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for zirconium carbide powder reduction synthesis by magnesium thermal combustion
  • Method for zirconium carbide powder reduction synthesis by magnesium thermal combustion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for synthesizing zirconium carbide powder by magnesia combustion reduction, it comprises the steps:

[0030] 1) The particle sizes of the raw material powders are: C powder 1 μm, ZrO 2 Powder 6μm, Mg powder 100μm; ZrO by weight percentage 2 Powder: 67.2%, C powder: 6.6%, Mg powder: 26.2%, select ZrO 2 Powder, C powder and Mg powder, spare;

[0031] 2) ZrO 2 Powder, C powder and Mg powder were mechanically ball milled and mixed for 5 hours, the ball-to-material ratio was 3:1, and then dried under high vacuum conditions for 10 hours; the uniformly mixed powder was put into the reactor, filled with argon as a protective atmosphere, and It is 0.1MPa, the tungsten wire is ignited and burned to cause a self-propagating reaction, and the reaction is completed within 1-2 minutes; after cooling, the combustion product is obtained;

[0032] 3) After the combustion product is crushed by a ball mill, sieve to obtain a powder with a particle size of less than 0.5 mm, ad...

Embodiment 2

[0035] A method for synthesizing zirconium carbide powder by magnesia combustion reduction, it comprises the steps:

[0036] 1) The particle sizes of the raw material powders are: C powder 1 μm, ZrO 2 Powder 6μm, Mg powder 100μm, ZrO by weight percentage 2 Powder: 67.2%, C powder: 6.6%, Mg powder: 26.2%, select ZrO 2 Powder, C powder and Mg powder, spare;

[0037] 2) ZrO 2 Powder, C powder and Mg powder were mechanically ball milled for 8 hours, the ball-to-material ratio was 3:1, and then dried under high vacuum conditions for 12 hours; the uniformly mixed powder was put into the reactor, filled with argon as a protective atmosphere, and It is 0.2MPa, the tungsten wire is ignited and burned to cause a self-propagating reaction, the reaction is completed within 1-2 minutes, and the combustion product is obtained after cooling;

[0038]3) After the combustion product is crushed by a ball mill, sieve to obtain a powder with a particle size of less than 0.5 mm, add 0.5 mol / l ...

Embodiment 3

[0041] A method for synthesizing zirconium carbide powder by magnesia combustion reduction, it comprises the steps:

[0042] 1) The particle sizes of the raw material powders are: C powder 1 μm, ZrO 2 Powder 6μm, Mg powder 100μm; ZrO by weight percentage 2 Powder: 67%, C powder: 6.9%, Mg powder: 26.1%, select ZrO 2 Powder, C powder and Mg powder, spare;

[0043] 2) ZrO 2 Powder, C powder and Mg powder were mechanically ball milled for 8 hours, the ball-to-material ratio was 3:1, and then dried under high vacuum conditions for 12 hours; the uniformly mixed powder was put into the reactor, filled with argon as a protective atmosphere, and It is 0.2MPa, the tungsten wire is ignited and burned to cause a self-propagating reaction, the reaction is completed within 1-2 minutes, and the combustion product is obtained after cooling;

[0044] 3) After the combustion product is crushed by a ball mill, sieve to obtain a powder with a particle size of less than 0.5 mm, add 0.5 mol / l d...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for synthesizing zirconium carbide powder, in particular to a method for synthesizing zirconium carbide powder by magnesium thermal combustion reduction, and the method is characterized by comprising the following steps: 1) selecting ZrO2 powder, C powder and Mg powder according to the corresponding weight percentage among the three: 67-68 percent to 6-7 percent to 26-27 percent; 2) uniformly mixing the ZrO2 powder, the C powder and the Mg powder, putting the uniformly mixed powder in a closed container, filling argon gas as the protection atmosphere, keeping the pressure between 0.1-0.2MPa,and obtaining the combustion products after ignition, combustion and cooling; 3) grinding and screening the combustion product to obtain the powder with less than 0.5mm of grain diameter, placing the powder into 0.5-2.0mol / L hydrochloric acid, acid cleaning for 1-10 hours at the temperature of 20-80 DEG C, filtering and drying the obtained products to obtain the zirconium carbide powder. The method has the advantages of simple process, short synthetic time and low cost, thus obtaining high-purity zirconium carbide powder.

Description

technical field [0001] The invention relates to a refractory compound and a solid-phase synthesis method thereof, in particular to a method for synthesizing zirconium carbide powder. Background technique [0002] Zirconium carbide ceramic powder is an extremely important new engineering ceramic raw material. Zirconium carbide ceramics is an important high-melting point, high-strength and corrosion-resistant ultra-high temperature structural material. The application space can improve the strength and corrosion resistance of cemented carbide. Zirconium carbide has high hardness, excellent wear resistance, good electrical and thermal conductivity, and is widely used in the manufacture of cutting tools, grinding wheels, and abrasives. Moreover, zirconium carbide has the characteristics of efficiently absorbing visible light and reflecting infrared rays. When it absorbs short-wavelength energy below 2 μm, which accounts for 95% of sunlight, it can store energy in the material t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/30
Inventor 傅正义张帆张金咏王为民王皓王玉成张清杰
Owner WUHAN UNIV OF TECH