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

Preparation method of ceramic-powder-enhanced zinc-aluminum alloy based composite material

A zinc-aluminum alloy and ceramic powder technology, which is applied in the field of composite material preparation, can solve the problems of large agglomeration of reinforced particles of composite materials, inability to produce composite materials, and decline in mechanical properties, so as to improve and optimize comprehensive mechanical properties , good comprehensive mechanical properties

Inactive Publication Date: 2012-11-21
CENT SOUTH UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both the squeeze casting method and the centrifugal casting method require that the alloy melt has good wettability to the reinforced particles, but the zinc-aluminum alloy has poor wettability to SiC particles, so the prepared composite reinforced particles The agglomeration is too large, so that its mechanical properties are seriously reduced
The semi-solid stirred solution casting method utilizes the blocking and retention of solid phase particles on SiC, which can overcome the defects of the above two methods to a certain extent, but still cannot solve the agglomeration phenomenon of the reinforcement, but only reduces the size of the agglomerated particles
The liquid impregnation method cannot produce a composite material with a predetermined ratio, and the in-situ generation method can produce Si particle-reinforced composite materials, but SiC, ZrO 2 Such particles are unlikely, so they cannot be used to make SiC, ZrO 2 Equal particle reinforced zinc matrix composites, especially composites with high volume fraction of ceramic particles
[0004] Although the addition of reinforcement can be adjusted arbitrarily by the powder sintering method, the composition ratio is accurate, and the volume fraction is convenient to control; however, the internal structure of the composite material produced is uneven and the porosity is large, which seriously affects the mechanical properties of the composite material.
In particular, the melting point of zinc-aluminum alloy is low, the atomic size in the alloy is large, and the wettability with ceramic particles is poor. It is difficult to make the composite material compact by sintering, and it is difficult to obtain a zinc-aluminum alloy matrix composite material with excellent performance.
This is why powder metallurgy has not been widely used in the field of zinc-aluminum alloy matrix composites for so many years.

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
  • Preparation method of ceramic-powder-enhanced zinc-aluminum alloy based composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1 uses commercial high-purity zinc (99.995%), high-purity aluminum (99.99%), Al-5%Ti master alloy, electrolytic copper, etc. as raw materials, according to Zn 87.6%, Al 10.17%, Cu 1.933%, Ti 0.0265% ratio, after melting and refining at 680°C, spray deposition and sieving to obtain ZAT10 powder with a particle size of less than 20 μm. Then weigh the SiC powder with a particle size of 18 μm and the ZAT10 powder at a mass ratio of 1:53, put them into a ball mill tank, use absolute ethanol as the ball mill medium, and ball mill in the ball mill tank for 8 hours; dry and pass through a 100-mesh sieve ; Then press molding, the pressure is 10Mpa. The compacted green body is raised to 390°C at a heating rate of 5-6°C / min in a tube furnace, preheated for 2-5h under nitrogen protection; then placed in a mold barrel with a diameter of 50mm (preheating temperature is Hot forging was carried out under a 300t hydraulic press at 250°C): hot forging pressure 150t, mold preh...

Embodiment 2

[0023] Embodiment 2 takes commercial high-purity zinc (99.995%), high-purity aluminum (99.99%), Al-5%Ti master alloy, electrolytic copper, etc. as raw materials, according to Zn 87.6%, Al 10.17%, Cu 1.933%, Ti 0.0265% ratio, after melting and refining at 700°C, spray deposition and sieving to obtain ZAT10 powder with a particle size of less than 20 μm. Then weigh the SiC powder with a particle size of 3 μm and the ZAT10 powder according to the mass ratio of 1:11, put them into a ball mill tank, use absolute ethanol as the ball mill medium, and ball mill in the ball mill tank for 10 h; dry and pass through a 100-mesh sieve ; Then press molding, the pressure is 30Mpa. The compacted blank is raised to 380°C at a heating rate of 7-8°C / min in a tube furnace, and preheated for 3 hours under the protection of argon; then placed in a mold barrel with a diameter of 50mm (preheating temperature is 250 ℃) under a 300t hydraulic press for hot forging: hot forging pressure 180t, mold preh...

Embodiment 3

[0025]Embodiment 3 uses commercial high-purity zinc (99.995%), high-purity aluminum (99.99%), Al-5%Ti master alloy, electrolytic copper, etc. as raw materials, according to Zn 87.6%, Al 10.17%, Cu 1.933%, Ti 0.0265% ratio, after melting and refining at 750°C, spray deposition and sieving to obtain ZAT10 powder with a particle size of less than 20 μm. Then weigh the SiC powder with a particle size of 48 μm and the ZAT10 powder at a mass ratio of 1:2.8, put them into a ball mill tank, use absolute ethanol as the ball mill medium, and ball mill in the ball mill tank for 12 hours; dry and pass through a 100-mesh sieve ; Then press molding, the pressure is 40Mpa. The compacted blank is raised to 390°C at a heating rate of 9-10°C / min in a tube furnace, and preheated for 5 hours under the protection of hydrogen; then placed in a mold barrel with a diameter of 50mm (preheating temperature is 250°C ) under a 300t hydraulic press for hot forging: hot forging pressure 200t, mold preheat...

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
lengthaaaaaaaaaa
hardnessaaaaaaaaaa
Login to View More

Abstract

The invention relates to a preparation method of a ceramic-powder-enhanced zinc-aluminum alloy based composite material. The preparation method comprises the following steps of: adding ceramic powder to atomized zinc-aluminum alloy powder, ball-milling and mixing, pressing to prepare a powder pre-formed component, preheating under gas protection, carrying out hot forging to obtain a composite material, and finally carrying out heat treatment on the zinc-aluminum alloy based composite material to eliminate defects in the material and optimize the comprehensive mechanical properties of the composite material. The invention has the advantages that: the process method is simple and convenient to operate; the prepared zinc-aluminum alloy base body and enhancing phase have uniform distribution,compact structure and good comprehensive mechanical properties; the defects that the ceramic powder can not be added because of poor wettability with zinc-aluminum alloy melt, and the powder has non-uniform distribution and agglomeration are overcome; at the same time, the problems that the composite material prepared by a powder sintering method has poor compactness, non-uniform internal structure, and more and larger pores are overcome; and the comprehensive mechanical properties of the composite material are improved. The preparation method is suitable for industrial application.

Description

technical field [0001] The invention relates to a preparation method of a ceramic powder reinforced zinc-aluminum alloy matrix composite material, in particular to a method of adding ceramic powder to alloy powder, high-pressure hot forging powder prefabrication to obtain a composite material, and then heat-treating the composite material to optimize its performance. ; Belongs to the technical field of composite material preparation. Background technique [0002] Zinc-aluminum alloy has good mechanical properties, wear resistance and friction reduction properties, low melting point, low energy consumption, low cost, and convenient forming. It can replace copper alloy or even aluminum alloy to prepare wear-resistant components such as bearing bushes, bushings, and bearings, and has attracted people's attention. . However, its eutectic temperature is low, its solidification range is large, and its high temperature strength is very low. In addition, the solid solubility of th...

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): C22C18/04C22C32/00C22C1/05
Inventor 李荐杨俊周宏明杨亮黄祖琼刘凡方珍奇刘雯雯朱玉华
Owner CENT SOUTH UNIV