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

Nb4AlC3 ceramic powder preparation method

A technology of ceramic powder and mixed powder, which is applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of high combustion synthesis temperature, difficult to control the reaction process, by-products, etc., and achieve low cost and high production efficiency. The effect of high efficiency and simple process

Inactive Publication Date: 2020-03-10
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And about Nb 4 AlC 3 There are very few reports on ceramic powders. He Xiaodong et al. [China Application No. 200910073098.2] used self-propagating high-temperature synthesis technology to prepare loose Nb 4 AlC 3 Ceramic materials, after subsequent crushing, grinding, sieving and drying can obtain high-purity Nb 4 AlC 3 Ceramic powder, but the combustion synthesis temperature of this preparation method is higher at 2000-3000 ° C, which will make Nb 4 AlC 3 Partial decomposition produces by-products, and the reaction process is difficult to control

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
  • Nb4AlC3 ceramic powder preparation method
  • Nb4AlC3 ceramic powder preparation method
  • Nb4AlC3 ceramic powder preparation method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0027] Nb 4 AlC 3 Preparation of ceramic powder The raw material powder includes: niobium powder, aluminum powder and carbon powder. Wherein, the carbon powder is graphite powder or / and carbon black powder. The particle size of the niobium powder may be 30-80 μm, the particle size of the aluminum powder may be 75-150 μm, and the particle size of the carbon powder may be 1-10 μm.

[0028] The raw material powder is mixed first to obtain a uniform, fine and active mixed powder. Wherein, the molar ratio of niobium powder and aluminum powder may be 4:(0.8-1.7), preferably 4:(1.1-1.5). The molar ratio of niobium powder and carbon powder may be 4:(2.5-3.2), preferably 4:(2.6-2.9). The mixing method can be ball milling, which specifically includes: putting niobium powder, aluminum powder and carbon powder into a ball milling tank that can pass through a protective gas for ball milling, and cooling naturally to room temperature to obtain a mixed powder. The lining of the ball mil...

Embodiment 1

[0033] Weigh 55.75g of niobium powder, 4.45g of aluminum powder and 4.86g of graphite powder, pour them into a zirconia ball mill jar, add 520g of zirconia ball mills and mix for 3 hours, and obtain a uniformly mixed powder after cooling. Wherein, the revolution speed of the ball mill is 300 rpm, and the rotation speed is 300 rpm. Put the mixed powder into the corundum boat, then put the corundum boat into the tube furnace and feed it with 95wt% argon + 5wt% hydrogen, calcinate at 1700°C for 30min, the heating rate is 4°C / min, after cooling with the furnace Grind it and sieve it to get Nb 4 AlC 3 ceramic powder;

[0034] Nb made by this example 4 AlC 3 The purity of the ceramic powder was 80.5 wt%.

Embodiment 2

[0036] This embodiment is different from Example 1 in that the ball milling time is 8 hours, and the calcination holding time is 20 minutes. Other steps and parameter are identical with embodiment 1;

[0037] Nb made by this example 4 AlC 3 The purity of the ceramic powder was 90.0 wt%.

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 Nb4AlC3 ceramic powder preparation method, which comprises the following steps: mixing niobium powder, aluminum powder and carbon powder to obtain mixed powder; and placingthe obtained mixed powder in a protective atmosphere, carrying out pressureless calcination at 1400-1750 DEG C for 1-720 minutes, and crushing and sieving to obtain the Nb4AlC3 ceramic powder.

Description

technical field [0001] The invention relates to a preparation method of a ternary layered compound single-phase ceramic powder, belonging to the field of ceramic powder preparation. Background technique [0002] In recent years, a class of ternary carbides or nitrides with a layered structure has attracted extensive attention from researchers. These compounds are usually M n+1 AX n Represents (n=1, 2, 3), referred to as MAX phase, in which "M" is mostly early transition metal elements of IIIB-VIB, "A" is the main group element of IIIA-VIA, "X" is C and / or N. According to the different values ​​of n in the general formula, the MAX phase can be divided into M 2 AX phase (also known as 211 phase), M 3 AX 2 Phase (also known as Phase 312) and M 4 AX 3 phase (also known as 413 phase) and so on. The unique layered structure and the coexistence of various chemical bonds make the MAX phase have some excellent properties of ceramics and metals. Such as high Young's modulu...

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 Applications(China)
IPC IPC(8): C01B32/90C04B35/56
CPCC01B32/90C04B35/5607C01P2002/72C01P2004/03
Inventor 黄政仁蔡平刘学建姚秀敏杨丽慧王鲁杰吴西士刘泽华
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI