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

Powder metallurgy preparation method of SiC/magnesium alloy AZ91 composite

A composite material, AZ91 technology, applied in the fields of metallurgy and metal materials, can solve the problems of large differences in the performance of composite materials, and achieve the effects of good friction coefficient stability, simple process and convenient operation.

Inactive Publication Date: 2013-03-06
HUANGHE S & T COLLEGE
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The performance of composite materials prepared by different processes varies greatly, and the friction and wear performance of magnesium-based composite materials prepared by powder metallurgy is unknown, and few scholars have studied or reported.

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
  • Powder metallurgy preparation method of SiC/magnesium alloy AZ91 composite
  • Powder metallurgy preparation method of SiC/magnesium alloy AZ91 composite
  • Powder metallurgy preparation method of SiC/magnesium alloy AZ91 composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1~2

[0013] Powder metallurgy preparation method of SiC / magnesium alloy AZ91 composite material: Mix powders of various specifications shown in Table 1 according to the formula listed in Table 2. After mixing evenly, put it into a vacuum drying oven to dry for 3 hours at a drying temperature of 100°C. Then pour it into a graphite mold and sinter in a RJY-2000 vacuum sintering press with a heating rate of 100°C / min, a sintering temperature of 500°C, a sintering pressure of 3MPa, and a holding time of 25min. get composite materials.

[0014]

[0015]

[0016] Performance test experiment:

[0017] Test 1: Microstructure of the material

[0018] figure 1 To observe the microscopic morphology of three samples with scanning electron microscope: (a) magnesium alloy AZ91 matrix (comparative example), (b) composite material containing 18 μm SiC (Example 1), (c) composite material containing 8 μm SiC Materials (Example 2). figure 1 (a) What you see is the magnesium alloy matrix, w...

Embodiment 3

[0033] The mass fraction of each component: Al powder 8.8%, Zn powder 0.8%, SiC particles 10%, and the balance is Mg powder. Among them, SiC particles: particle size 10 μm, purity ≥ 99.5%; Mg powder: particle size 50 μm, purity ≥ 99.9%; Al powder: particle size 50 μm, purity ≥ 99.5%; Zn powder: particle size 20 μm, purity ≥ 99.9%.

[0034] The preparation process is the same as in Examples 1 and 2, except that the drying temperature is 120°C and the drying time is 2.5h; the sintering conditions are: heating rate 110°C / min, sintering temperature 450°C, sintering pressure 2.5MPa, and holding time 15min.

Embodiment 4

[0036] The mass parts of each component: Al powder 9.2%, Zn powder 1.2%, SiC particles 13%, and the balance is Mg powder. Among them, SiC particles: particle size 15 μm, purity ≥ 99.5%; Mg powder: particle size 60 μm, purity ≥ 99.9%; Al powder: particle size 60 μm, purity ≥ 99.5%; Zn powder: particle size 30 μm, purity ≥ 99.9%.

[0037] The preparation process is the same as in Examples 1 and 2, except that the drying temperature is 150°C, and the drying time is 2h; the sintering conditions are: heating rate 120°C / min, sintering temperature 480°C, sintering pressure 3MPa, holding time 20min.

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 sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical fields of metal materials and metallurgy and discloses a powder metallurgy preparation method of a SiC / magnesium alloy AZ91 composite. The composite comprises the following components by weight percent: 9+ / -0.2% of Al powder, 1+ / -0.2% of Zn powder, 10-15% of SiC particles and the balance of Mg powder. The preparation method comprises the following steps: evenly mixing the components, drying, then sintering, and finally cooling the product along with the furnace to obtain the composite. The sintering conditions are as follows: the heating rate is 100-120 DEG C / min, the sintering temperature is 450-500 DEG C, the sintering pressure is 2.5-3MPa and the temperature preservation time is 15-25 minutes. The method is simple in process and convenient in operation. A scanning electron microscope is used to observe the microstructure of the prepared material and a friction and wear test is performed. The results show that the performances of the composite with SiC are increased, and the smaller SiC particles are, the better the composite performances are.

Description

technical field [0001] The invention belongs to the technical field of metal materials and metallurgy, and in particular relates to a powder metallurgy preparation method of SiC / magnesium alloy AZ91 composite material. Background technique [0002] Magnesium alloys have attracted extensive attention from researchers at home and abroad due to their advantages such as low density, high specific strength and specific stiffness, and good shock absorption performance, and have been widely used in the automotive industry, aerospace industry and other fields. But the wear resistance of magnesium alloy is not good. A large number of studies at home and abroad, such as friction stir processing, jet stirring, melt stirring, ultrasonic dispersion, etc., have shown that adding SiC particles to the magnesium alloy matrix to prepare magnesium-based composites can significantly enhance the wear resistance of magnesium alloys. performance. The powder metallurgy method is widely used for i...

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): C22C1/05C22C32/00C22C23/00
Inventor 杨汉嵩刘建秀刘超峰赵志明蒋爱云周亚军卢中宁张世涛李小辉訾晓阳邱慧谷明辉何春霞李育文杨改云
Owner HUANGHE S & T COLLEGE