Magnesium-rare earth-boron alloy with high heat resistance and preparation method thereof

A technology of magnesium rare earth alloy and boron alloy, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of reduced alloy strength and creep resistance, high alloy cost, and single added element. Achieve the effect of improving high temperature strength and creep performance, reducing production cost, and simple boronizing process

Inactive Publication Date: 2014-06-11
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heat-resistant magnesium alloy (CN102171374B) of Toyota Automatic Loom Co., Ltd., the alloy has added Al, Ca and Mn elements, and these compounds form crystallization compounds at the grain boundaries of magnesium grains, so that the magnesium alloy can be used at high temperatures. It is also not easy to slip on the bottom surface, and shows high mechanical properties at high temperatures, but the addition of elements is too single, and it is easy to affect other properties of the alloy due to excessive elements. At the same time, the high-temperature creep performance is poor, and the service temperature does not exceed 230°C
A heat-resistant magnesium alloy (CN101818293B) produced by Guangzhou Institute of Nonferrous Metals. Al, Zn, Si, Ca and Sr elements are added to this alloy. The Sr element can refine the grain and modify the quality. The alloy has good structure and properties. The

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Cut the Mg-8wt.%Gd magnesium-gadolinium alloy into a cylindrical sample of Φ6.5mm×8mm, and polish the surface of the magnesium-gadolinium alloy with 150#, 320#, 600#, 1200#, 2000# sandpaper in sequence, and visually inspect the magnesium-gadolinium alloy. The direction of the scratches on the surface of the gadolinium alloy should be consistent, and then rinsed with deionized water, and the surface of the magnesium-gadolinium alloy is polished by water throwing with a polishing cloth until the scratches disappear. Finally, the polished magnesium-gadolinium alloy was ultrasonically cleaned with an ultrasonic cleaner, using absolute ethanol as a cleaning agent, the cleaning temperature was 15° C., and the cleaning time was 10 minutes.

[0020] First use a cold press to wrap the above-mentioned magnesium-gadolinium alloy with low-cost boron nitride powder, then place a cylindrical pyrophyllite block with the same inner diameter at the bottom of the graphite tube, and place ...

Embodiment 2

[0023] Cut the Mg-5wt.%La-5wt.%Ce magnesium lanthanum cerium alloy into a cylindrical sample of Φ6.5mm×8mm, and use 150#, 320#, 600#, 1200#, 2000# sandpaper to grind the magnesium gadolinium alloy The surface is polished clean, and the scratches on the surface of the magnesium-lanthanum-cerium alloy are visually inspected in the same direction, then rinsed with deionized water, and the surface of the magnesium-lanthanum-cerium alloy is polished until the scratches disappear with a polishing cloth. Finally, the polished magnesium-lanthanum-cerium alloy was ultrasonically cleaned with an ultrasonic cleaner, using absolute ethanol as a cleaning agent, the cleaning temperature was 15° C., and the cleaning time was 15 minutes.

[0024] First use a cold press to wrap the above-mentioned magnesium-lanthanum-cerium alloy with low-cost boron nitride powder, then place a cylindrical pyrophyllite block with the same inner diameter at the bottom of the graphite tube, and stick the wrapped ...

Embodiment 3

[0027] Cut the Mg-5wt.%Nd-5wt.%Tb-5wt.%Tm magnesium neodymium terbium thulium alloy into a cylindrical sample of Φ6.5mm×8mm, and use 150#, 320#, 600#, 1200#, 2000# #Sandpaper Polish the surface of the magnesium-neodymium-terbium-thulium alloy, visually inspect the direction of the scratches on the surface of the magnesium-neodymium-terbium-thulium alloy, then rinse with deionized water, and use a polishing cloth to polish the surface of the magnesium-neodymium-terbium-thulium alloy to Scratches disappear. Finally, the polished magnesium-neodymium-terbium-thulium alloy was ultrasonically cleaned with an ultrasonic cleaner, using absolute ethanol as a cleaning agent, the cleaning temperature was 15° C., and the cleaning time was 12 minutes.

[0028] First use a cold press to wrap the above-mentioned magnesium, neodymium, terbium and thulium alloy with cheap boron nitride powder, then place a cylindrical pyrophyllite block with the same inner diameter at the bottom of the graphit...

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Abstract

The invention relates to a magnesium-rare earth-boron alloy with high heat resistance. The chemical formula is Mg-xRE-yB, wherein RE represents one or more of 17 rare earth elements. When many rare earth elements coexist, the mass fractions of the rare earth elements are equal; x and y are mass fractions, x is greater than or equal to 7% but less than or equal to 12% while y is greater than or equal to 0.05% but less than or equal to 3%. The preparation method provided by the invention mainly comprises the following steps: carrying out surface pre-treatment on a magnesium-rare earth alloy; grinding, polishing and cleaning; wrapping the magnesium-rare earth alloy by boron nitride through a cold press; assembling to a high-pressure test sample; placing the sample in a high-pressure cubic press for high-pressure boriding to obtain the magnesium-rare earth-boron alloy comprising a boron-rare earth compound. The method provided by the invention is simple and easy to control, and low in cost. The high-pressure boriding process is safe and non-toxic so as to avoid the environmental pollution caused by harmful gases. The prepared magnesium-rare earth-boron alloy can be used for a long time at a temperature of 300 DEG C.

Description

technical field [0001] The invention relates to an alloy and a preparation method thereof. Background technique [0002] As the lightest commercial metal engineering structural material at present, magnesium alloy is widely used in modern industry. Compared with other metal materials, magnesium alloy has the characteristics of low density, high specific strength, high specific stiffness, excellent thermal and electrical conductivity, good dimensional stability, electromagnetic shielding and easy recycling. Although magnesium alloys have many advantages, they still have disadvantages such as heat resistance, poor corrosion resistance and low room temperature plasticity. Generally, the high temperature resistance of magnesium alloy is poor, and the working temperature cannot exceed 120-150°C, which greatly limits its wide application. [0003] At this stage, the high temperature performance of magnesium alloys is improved by various methods such as deformation hardening, gra...

Claims

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Application Information

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IPC IPC(8): C22C23/06C23C8/68
Inventor 彭秋明付辉李慧
Owner YANSHAN UNIV
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