Foamed Metal Materials Preparation Technology

2011 ◽  
Vol 197-198 ◽  
pp. 518-521
Author(s):  
Jian Ning Wei ◽  
Gao Ping Xu ◽  
Li Ling Zhou ◽  
Xue Yun Zhou ◽  
Wei Jun Xie
Keyword(s):  
Air Pressure ◽  
Preparation Technology ◽  
Infiltration Process ◽  
Pressure Infiltration ◽  
Metal Materials ◽  
Materials Preparation

The paper presents the technology of preparation about foamed metal materials, which were prepared by an air pressure infiltration process.

Effects of Macroscopic Pores on the Damping Behaviors of Metal Materials

2011 ◽  
Vol 66-68 ◽  
pp. 1155-1162
Author(s):  
Jian Ning Wei ◽  
Gen Mei Li ◽  
Li Ling Zhou ◽  
Xue Yun Zhou ◽  
Jian Min Yu ◽  
...  
Keyword(s):  
Internal Friction ◽  
Pure Aluminum ◽  
Air Pressure ◽  
Damping Capacity ◽  
Infiltration Process ◽  
Pressure Infiltration ◽  
Temperature Range ◽  
Commercially Pure ◽  
Damping Behavior ◽  
Metal Materials

A large number of macroscopic pores were introduced into commercially pure aluminum (Al) and Zn-Al eutectoid alloy by air pressure infiltration process to comparatively study the influence of macroscopic pores on the damping behaviors of the materials. Macroscopic pores size are on the order of a millimetre (0.5~1.4mm) and in large proportions, typically high 76vol.%. The damping behavior of the materials is characterized by internal friction (IF). The IF was measured on a multifunction internal friction apparatus (MFIFA) at frequencies of 0.5, 1.0 and 3.0 Hz over the temperature range of 25 to 400 °C, while continuously changing temperature. The damping capacity of the metal materials is shown to increase with introducing macroscopic pores. Finally, the operative damping mechanisms in the metal materials with macroscopic pores were discussed in light of IF measurements.

Effects of Macroscopic Pores on the Damping Behavior of Zn-Al Eutectoid Alloy

2012 ◽  
Vol 182-183 ◽  
pp. 213-216
Author(s):  
J.N. Wei ◽  
X.B. Chao ◽  
T.C. Huang ◽  
L.S. Yu ◽  
J.S. Zou ◽  
...  
Keyword(s):  
Internal Friction ◽  
Heating Temperature ◽  
Air Pressure ◽  
Damping Capacity ◽  
Alloy Specimen ◽  
Infiltration Process ◽  
Pressure Infiltration ◽  
Temperature Range ◽  
Damping Behavior ◽  
Eutectoid Alloy

The objective of present work is to investigate the effect of macroscopic pores on the damping behavior of Zn-Al eutectoid alloy. The damping behavior of the foamed Zn-Al (FZA) eutectoid alloy prepared by air pressure infiltration process with macroscopic pores is characterized by internal friction (IF). Macroscopic pores size are on the order of a millimetre (0.51.0mm). The IF was measured on a multifunction internal friction apparatus (MFIFA) at frequencies of 0.5, 1.0 and 3.0 Hz over the temperature range of 25 to 400°C, while continuously heating temperature. The damping capacity of the FZA eutectoid alloy, with two different porosity and sizes of macroscopic pores, were compared with that of bulk Zn-Al eutectoid alloy specimen. The damping capacity of the materials is shown to increase with introducing macroscopic pores. Finally, the operative damping mechanisms in the FZA eutectoid alloy were discussed in light of IF measurements.

Microstructure and Hardness of Ni-Cr Porous Preform Reinforced Al-Based Composites by Low Infiltration Method

2011 ◽  
Vol 275 ◽  
pp. 251-254
Author(s):  
Hua Wei Rong ◽  
Cheol Hong Park ◽  
Won Jo Park ◽  
Han Ki Yoon
Keyword(s):  
Intermetallic Compounds ◽  
Rapid Development ◽  
High Hardness ◽  
Optical Microscope ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
Infiltration Process ◽  
Pressure Infiltration ◽  
X Ray ◽  
Infiltration Method

With the rapid development of aerospace and automobile industries, metal matrix composites (MMCs) have attracted much attention because of its excellent performance. In this paper, Ni-Cr/AC8A composites reinforced with porous Ni-Cr preform were manufactured by low pressure infiltration process, infiltration temperatures are 700oC~850oC. The microstructure and phase composition of composites were evaluated using optical microscope, X-ray diffraction (XRD) and electro-probe microanalysis (EPMA), It's found that they're intermetallic compounds generated in the composites. Recently, intermetallic compounds have attracted much attention as high-temperature material. We study the hardness of Ni-Cr/AC8A composites, the results show the Ni-Cr/AC8A composite has high hardness due to the intermetallic compounds exist.

Infiltration of C/SiC composites with silica sol-gel solutions: Part II. Infiltration under isostatic pressure and oxidation resistance

1999 ◽  
Vol 14 (11) ◽  
pp. 4239-4245 ◽  
Author(s):  
Mario Aparicio ◽  
Alicia Durán
Keyword(s):  
Sol Gel ◽  
Applied Pressure ◽  
Process Variable ◽  
Solution Concentration ◽  
Silica Sol ◽  
Infiltration Process ◽  
Pressure Infiltration ◽  
C Fibers ◽  
Sic Composites ◽  
Infiltration Method

An infiltration process that uses silica sol-gel solutions was developed to protect C/SiC composites against oxidation. The infiltration is assisted using isostatic pressure. Different process parameters including substrate porosity and solution concentration and viscosity were varied to optimize the infiltration effectiveness. Applied pressure enhances penetration of solutions, reducing the importance of viscosity, an important process variable for dipping infiltration. The effectiveness of the isostatic pressure infiltration method, evaluated through the total weight gains and pore-size distribution of infiltrated samples, is compared with results of dipping infiltration. The oxidation behavior of the infiltrated samples, was evaluated by stepwise oxidation test as well as isothermal tests at 1200 and 1600 °C. The infiltrated SiO2 protects the C/SiC substrate, reducing the burnoff rate of C fibers at low temperature and delaying the oxidation of SiC.

Manufacture of Al/SiC Composites by Pressure Infiltration Process

2005 ◽  
Vol 475-479 ◽  
pp. 913-916
Author(s):  
Fa Zhang Yin ◽  
Cheng Chang Jia ◽  
Xuezhen Mei ◽  
Bin Ye ◽  
Yanlei Ping ◽  
...  
Keyword(s):  
Relative Density ◽  
Process Parameters ◽  
Room Temperature ◽  
Sintering Process ◽  
Homogeneous Microstructure ◽  
Infiltration Process ◽  
Pressure Infiltration ◽  
Upper Limit ◽  
Thermal Debinding ◽  
Sic Composites

The SiCp performing sample was made first then Al/SiCp (65%) was manufactured. Appropriate component and proportion of binder and process parameters were selected to control the porosity. Debinding has succeeded by extractive and thermal debinding processes. SiCp preforming samples with good appearance, enough strength, and right porosity were obtained by pre-sintering process at 1100°C. Composites with high density and homogeneous microstructure were manufactured by pressure infiltration under 1050°C and 15MPa. The distribution of aluminium and silicon elements was homogeneous. The primary components of materials are aluminium, β-SiC and α-SiC. The thermal expand coefficient of composites is 8.0×10-6/°C at room temperature, which increases with temperature and reaches to 11.0×10-6/°C at 300°C. The density is 2.92g/cm3, and relative density is more than 97 %. The strength is about 500MPa, approaching to the upper limit of the theoretical value.

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