gr/n-sic p Composite reinforced magnesium matrix composite material and preparation method thereof

Abstract

The present invention discloses GR / N‑SiC P Composite reinforced magnesium-based composite material, composed of the following raw material components by weight percentage: GR powder 0.5-1.5%, N-SiC P Powder 0.5-10%, the balance is magnesium powder, the sum of the weight percentages of the above components is 100%. Also disclosed is a preparation method for the above-mentioned material, including the following steps: Step 1, high-energy ball milling: Weigh the raw materials according to the above-mentioned weight percentages: take the above-mentioned GR powder, N-SiC P Powder and magnesium powder are placed in a high-energy ball mill at 30-60 rpm and mixed for 12-24 hours under the protection of argon; step 2, extrusion molding: the GR powder and N-SiC after ball milling in step 1 P The powder and magnesium powder mixture is extruded in two steps, first reciprocating extrusion, and then ordinary forward extrusion. This preparation method addresses the N‑SiC P The problem of agglomeration, and can ensure that the composite material has a certain elongation.

Description

technical field [0001] The invention belongs to the technical field of metal materials and metallurgy, in particular to a GR / N-SiC P Composite reinforced magnesium-based composite material, the present invention relates to this kind of GR / N-SiC P A method for preparing composite reinforced magnesium-based composite materials. Background technique [0002] With the development of automobile lightweight and aerospace technology, aluminum matrix composites are the first to be studied and used in light metal matrix composites. At present, due to the high specific strength, modulus, hardness, and dimensional stability of magnesium-based composite materials, as well as excellent wear resistance, corrosion resistance, vibration damping performance and high temperature performance. By adding a reinforcing phase to the matrix of magnesium and magnesium alloys, the density of the prepared magnesium-based composites can be controlled at 2.0g / cm 3 About, high specific strength and sp...

AI Technical Summary

Problems solved by technology

However, during the whole preparation process, the particle size, purity and dryness of the added powder must be strictly controlled; there are many technical parameters in the sintering process, and it is difficult to grasp

At the same time, the powder metallurgy equipment is complex, the cost is high, it is not easy to prepare large-volume and complex-shaped parts, and there is a danger of powder combustion and explosion during the production process, and it is difficult to control the density of composite materials stably; the spray deposition method is the obtained The composite material has high density and fine structure, but the cost of the gas used is high, and the porosity of the obtained composite material is high, which requires secondary treatment; casting method is currently the main method for preparing metal matrix composite materials, and the patent disclosed by Yan Hong "SiC p / AZ61 composite material semi-solid preparation method" (application number: 200710068156.3, publication number: CN101045965A, publication date: 2007.10.03) through the semi-solid process, using flux and argon protection, AZ61 magnesium alloy is remelted, and SiC is added p Particles, stirred to finally obtain magnesium matrix composites

Although this method can prepare magnesium-based composites with complex shapes, the high temperature in the process of remelting the magnesium alloy matrix will not only cause the burning of alloy elements, but also cause SiC p Agglomeration and uneven distribution will reduce the comprehensive mechanical properties of the composite material, so further improvement of its process is needed; in situ synthesis method is more researched on TiC, Al 2 o 3 reinforced composites, while SiC P There are very few reinforced magnesium alloy matrix composites; Xu Chunjie's published patent "New SiC P Preparation Method of Particle Reinforced Rapidly Solidifying Magnesium Alloy Composite Material" (Application No.: ZL201310004263.5, Publication No.: CN103114217A, Publication Date: 2013-05-22), the reinforcement SiC used P Preparation of composites by powder mixing and extrusion for micron scale

The process is complicated and the cost is high, SiC P Larger particle size, SiC P The interface with the magnesium matrix grains may cause the splitting effect on the matrix, and the effect on improving the mechanical properties is not obvious

[0008] Although metal matrix composites have been developed for more than 40 years, basic research on the composite mechanism and interface strengthening mechanism of magnesium-based composites is still insufficient, and its preparation process needs to be improved and perfected urgently. still needs to be further improved

[0009] At present, the use of graphene (GR) and nano-silicon carbide (N-SiC P ) Composite reinforcement of magnesium and magnesium alloy matrix composites has not been reported yet

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