Dissertation > Excellent graduate degree dissertation topics show

Magnesium alloy foam Preparation and Properties

Author: XuMengXin
Tutor: WangLuCai
School: Taiyuan University of Science and Technology
Course: Materials Processing Engineering
Keywords: Metal foam Magnesium alloy foam Vacuum seepage Plaster Compression Performance Thermal properties
CLC: TB383.4
Type: Master's thesis
Year: 2010
Downloads: 162
Quote: 1
Read: Download Dissertation

Abstract

Metal foam as a new multifunctional materials, structure and properties of its special characteristics, the current rapid development of science and technology much attention. On the metal foam preparation, properties and application of research in recent years, more and more extensive and in-depth. The metal foam properties and then from preparation to practical application, there are still many problems not solved. To this end, we focused on preparation method and performance studies to make it faster and more widely applied. Based on previous research experience, further theoretical analysis and after several tests, the use of salt seepage law and plaster casting method to achieve a successful foam magnesium alloy sample preparation, and analysis of the bubble compression performance magnesium alloys and thermal performance. Resulting in the following findings: (1) to obtain salt seepage foam casting magnesium alloy prepared by the process method and parameters: 1) mold preparation: particle filler salt (NaCl) using hierarchical compaction. 2) casting: mold, mold preheat temperature is 590 ~ 610 ℃, magnesium alloy melting temperature is 760 ~ 780 ℃, pouring temperature of 720 ~ 730 ℃, vacuum of-0.03MPa. 3) Cleanup: High pressure water wash specimens. 4) NaCl solution on the corrosion mechanism of magnesium alloy foam analysis. Successfully prepared porosity in the range 40% -75% of the samples, the maximum diameter of the sample is 75mm, 100mm high cylindrical specimens. (2) to obtain plaster casting magnesium alloy prepared foam method and parameters of the process: 1) gypsum-based irrigation system: the use of polyurethane foam as the parent material for the preparation of plaster; plaster slurry configurations: solid powder ( gypsum powder and magnesium powder mix ratio 100:15), water. 55g per 100g of water with solid powder, the configuration is complete irrigation system plaster. 2) Roasting: get the roasting process temperature curve. 3) casting process with salt seepage law. 4) cleaning: water erosion or additional microseismic. 5) Combustion Phenomena casting process. Success rate of 95% porosity was prepared sample. (3) obtained from the static compression test foam magnesium alloy compressive stress - strain curve. Compression deformation mechanism of the material analyzed to determine which is brittle deformation. Found that the higher the porosity, the stress - strain curve of the lower platform, and the stress is smaller. Compression deformation, the stress plateau phase reaction of the magnesium alloy material foam absorbent powerful capabilities. (4) Determination of the foam thermal conductivity of the magnesium alloy material, the value is very low, the equivalent thermal resistance material. After a cooling effect on the foam magnesium alloy analysis of the principle, to produce various styles to foam magnesium alloy body for the computer CPU heat sink. And determine its thermal performance, through comparative analysis proposed optimization.

Related Dissertations

CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
© 2012 www.DissertationTopic.Net Mobile