Method for manufacturing quasicrystal and alumina mixed particulate reinforced magnesium-based composite material

Patent metadata

Field	Value
Publication number	US-10844461-B2
Application number	US-201816140820-A
Country	US
Kind code	B2
Filing date	Sep 25, 2018
Priority date	Feb 6, 2015
Publication date	Nov 24, 2020
Grant date	Nov 24, 2020

Abstract

A method for manufacturing a quasicrystal and alumina mixture particles reinforced magnesium matrix composite, includes manufacturing a quasicrystal and alumina mixture particles reinforcement phase, including preparing raw materials for the quasicrystal and alumina mixture particles reinforcement phase including a pure magnesium ingot, a pure zinc ingot, a magnesium-yttrium alloy in which the content of yttrium is 25% by weight, and nanometer alumina particles, the elements having the following proportion by weight 40 parts of magnesium, 50-60 parts of zinc, 5-10 parts of yttrium and 8-20 parts of nanometer alumina particles of which the diameter is 20-30 nm, pretreating the metal raw materials, cutting the pure magnesium ingot, the pure zinc ingot and the magnesium-yttrium alloy into blocks, removing oxides attached on the surface of each metal block, placing the blocks into a resistance furnace to preheat at 180° C. to 200° C., and filtering out the absolute ethyl alcohol after standing, and drying.

First claim

The invention claimed is:

1. A method for manufacturing a quasicrystal and alumina mixture particles reinforced magnesium matrix composite, orderly comprising:
manufacturing a quasicrystal and alumina mixture particles reinforcement phase, comprising
preparing raw materials for manufacturing the quasicrystal and alumina mixture particles reinforcement phase comprising a pure magnesium ingot, a pure zinc ingot, a magnesium-yttrium alloy in which the content of yttrium is 25% by weight, and nanometer alumina particles, the elements having the following proportion by weight 40 parts of magnesium, 50-60 parts of zinc, 5-10 parts of yttrium and 8-20 parts of nanometer alumina particles of which the diameter is 20-30 nm;
pretreating metal raw materials,
cutting the pure magnesium ingot, the pure zinc ingot and the magnesium-yttrium alloy into metal blocks,
removing oxides attached on a surface of each metal block, and
placing the metal blocks into a resistance furnace to preheat and keep at 180° C. to 200° C. for 20 minutes to 30 minutes;

pretreating the nanometer alumina particles, including
putting the nanometer alumina particles into a beaker,
adding absolute ethyl alcohol,
placing the nanometer alumina particles in an ultrasonic cleaner to shock for 15 minutes to 20 minutes, and
filtering out the absolute ethyl alcohol after standing, and drying in an oven at 590° C. to 610° C. for 5 to 8 minutes so as to completely evaporate the absolute ethyl alcohol where the ultrasonic cleaner has frequency of 20 KHz and power of 1000 W;
flux-free smelting under a first shielding gas, including
placing the pretreated pure magnesium ingot into a crucible of a melting furnace after the crucible is preheated to dark red,
when the temperature of the crucible continues to rise to more than 400° C., continuously providing the first shielding gas to keep the subsequent smelting under protective atmosphere;
homogenizing treating an alloy melt including,
adding the pure zinc ingot after the pure magnesium ingot is completely melted at 700° C.,
stirring and homogenizing the alloy melt after the pure zinc ingot is completely melted to separate oxides from the melt and to remove impurities on the surface;
continuously heating the alloy melt to 760° C.,
adding the magnesium-yttrium alloy,
stirring to homogenize the alloy melt after the magnesium-yttrium alloy is completely melted;
adding of the nanometer alumina particles including,
cooling the alloy melt to 700° C., and
coating the nanometer alumina particles with a magnesium foil pressed into the alloy melt and
stirring for 3 minutes to get diffusion of the nanometer alumina particles in the alloy melt to be fully and uniformly;
allowing to stand for 10 to 15 minutes after stirring,
removing impurities and oxides on the surface;
pouring the alloy melt into a metal mould preheated to 200° C. in advance and
removing the quasicrystal and alumina mixture reinforcement phase after solidification;
ball-milling the quasicrystal and alumina mixture reinforcement phase, including
breaking the quasicrystal and alumina mixture reinforcement phase,
adding alloy pieces into a planetary ball mill and
milling the alloy pieces; and
screening out particles having the size of 100 to 200 mesh using a stainless steel sieve to obtain the quasicrystal and alumina mixture particles reinforcement phase;
manufacturing a particles reinforcement phase-magnesium alloy matrix melt mixture slurry, including preparing raw materials for smelting the magnesium alloy matrix comprising a pure magnesium ingot, a pure aluminum ingot, a pure zinc ingot, a magnesium-manganese alloy, a magnesium-silicon alloy and a magnesium-calcium alloy; the elements having the following proportion by weight 1000 parts of magnesium, 90 parts of aluminum, 10 parts of zinc, 1.5-5 parts of manganese, 0.5-1 part of silicon and 0.1-0.5 part of calcium;
pretreating metal raw materials, including
cutting the pure magnesium ingot, the pure aluminum ingot, the pure zinc ingot, the magnesium-manganese alloy, the magnesium-silicon alloy and the magnesium-calcium alloy into metal blocks,
removing oxides attached on a surface of each metal block, and
placing the raw materials into a resistance furnace to preheat and keep at 180° C. to 200° C. for 20 minutes to 30 minutes to remove moisture attached on the surface of each metal block; flux-free smelting under a second shielding gas, including
placing the pure magnesium ingot and the pure aluminum ingot into a crucible and
heating up to 700° C. to melt after the crucible is preheated to dark red,
when the temperature rises to more than 400° C., continuously providing the second shielding gas to keep the subsequent smelting under protective atmosphere to prevent a magnesium alloy melt from oxidizing and burning;
homogenizing treating of an alloy melt, including
adding the preheated magnesium-manganese alloy at 700° C. after the metals are completely melted,
adding the preheated pure zinc ingot sequentially at 700° C. after melting,
stirring and homogenizing the alloy melt after melting to separate oxides from the melt and to remove impurities on the surface are removed,
continuously heating up to 720° C.,
adding the preheated magnesium-silicon alloy and the preheated magnesium-calcium alloy, thereby obtaining a magnesium alloy matrix melt after melting, and
stirring to homogenize the magnesium alloy matrix melt;
coating the quasicrystal and the alumina mixture particles reinforcement phase using an aluminum foil and
pressing the quasicrystal and the alumina mixture particles reinforcement phase into the magnesium alloy matrix melt,
mixing the quasicrystal and alumina mixture particles reinforcement phase with the magnesium alloy matrix melt to be homogenous by staged variable speed stirring, thereby obtaining the particles reinforcement phase-magnesium alloy matrix melt mixture slurry where the weight ratio of the quasicrystal and alumina mixture particles reinforcement phase to the magnesium alloy matrix is (4-8):100;
allowing the particles reinforcement phase-magnesium alloy matrix melt mixture slurry to stand for 10 to 15 minutes, so as to separate oxides from the melt, and to remove impurities on the surface;
casting ingot by pouring and extrusion, including cooling the particles reinforcement phase-magnesium alloy matrix melt mixture slurry to 700° C. in a crucible of the smelting furnace;
preheating a steel mould in an extruder to 180° C. ˜200° C.;
opening a cover of the smelting furnace, and
aligning the cover with a pouring gate of the mould of the extruder, and
pouring until a cavity is filled;
performing die closing and extrusion by the extruder under extrusion pressure of 100 MPa for 15 to 20 seconds; by the pressure of a punch of the extruder, the particles reinforcement phase-magnesium alloy matrix melt mixture slurry in the cavity of the mould generates high pressure solidification and plastic deformation under mechanical static pressure of 100 MPa,
cooling the ingot and the mould to room temperature naturally;
opening the mould, and
pushing out the ingot using an ejector pin device protruding out from a base of the extruder, thereby obtaining the finished product of the quasicrystal and alumina mixture particles reinforced magnesium matrix composite.

2. The method for manufacturing a quasicrystal and alumina mixture particles reinforced magnesium matrix composite according to claim 1 , wherein at least one of the first shielding gas and the second shielding gas is a mixture gas of air, carbon dioxide and tetrafluoroethane, and the volume ratio of air, carbon dioxide and tetrafluoroethane in the mixture gas is 74:25:1, the mixture gas is introduced to a position of 1 cm-2 cm above a metal melt surface, the flow rate of the shielding gas is 1 L/min, the exhaust pressur

Assignees

• Univ North China

Inventors

• Yuhong Zhao
• Hua Hou
• Yuchun Jin
• Jinke Wu
• Ling Yang

Classifications

• C22C32/0036

  Matrix based on Al, Mg, Be or alloys thereof · CPC title

• C22C1/1036

  starting from a melt · CPC title

• C22C1/02 Primary

  by melting {(C22C1/1036 takes precedence)} · CPC title

• B22D27/003

  by using inert gases · CPC title

• B22D29/04

  Handling or stripping castings or ingots (grippers in general, see the relevant subclasses, e.g. B66C) · CPC title