Corrosion Protection of Particulate Aluminum-Matrix Composites by Anodization

1996 ◽  
Vol 451 ◽  
Author(s):  
Jiangyuan Hou ◽  
D. D. L. Chung
Keyword(s):  
Corrosion Resistance ◽  
Pure Aluminum ◽  
Aluminum Matrix ◽  
Electrochemical Process ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Corrosion Properties ◽  
Aluminum Anodization ◽  
Better Than ◽  
Sic Particle

ABSTRACTAnodization is effective for improving the corrosion resistance of aluminum-matrix composites. For SiC particle filled aluminum, anodization was performed successfully in sulfuric acid electrolyte, as usual. However, for AlN particle filled aluminum, anodization needed to be performed in an alkaline (0.7 N NaOH) electrolyte, because NaOH reduced the reaction between AlN and water, whereas an acid enhanced this reaction. The concentration of NaOH in the electrolyte was critical; too high a concentration caused the dissolution of the anodizing product (Al2O3) by the NaOH, whereas too low a concentration did not provide enough ions for the electrochemical process. The corrosion properties and anodization characteristic of pure aluminum, Al/AlN and Al/SiC were compared. Without anodization, pure Al had better corrosion resistance than the composites and Al/SiC had better corrosion resistance than Al/AlN. After anodization, the corrosion resistance of Al/AlN was better than Al/SiC and both composites were better than pure Al without anodization, but still not as good as the anodized pure Al.

Corrosion Protection of Aluminum-Matrix Composites

1995 ◽  
Vol 390 ◽  
Author(s):  
Jiangyuan Hou ◽  
D. D. L. Chung
Keyword(s):  
Thermal Conductivity ◽  
Corrosion Resistance ◽  
Surface Treatment ◽  
Aluminum Matrix ◽  
Electrochemical Process ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Acid Electrolyte ◽  
Effective Surface ◽  
Aluminum Anodizing

ABSTRACTAluminum-matrix composites are attractive in their combination of low CTE and high thermal conductivity. Anodizing is an effective surface treatment for improving the corrosion resistance of aluminum-matrix composites. ForSiC filled aluminum, anodizing was performed successfully in an acid electrolyte, as usual. However, for AIN filled aluminum, anodizing needed to be performed in an alkaline (NaOH) electrolyte instead of an acid electrolyte, because NaOH reduced the reaction between AIN and water, whereas an acid enhanced this reaction. The concentration of NaOH in the electrolyte was critical; too high a concentration of NaOH caused the dissolution of the anodizing product (A12O3) by the NaOH, whereas too low a concentration of NaOH did not provide enough ions for the electrochemical process.

3M PURE ALUMINUM MATRIX COMPOSITES

Alloy Digest ◽  
1997 ◽  
Vol 46 (12) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Shear Strength ◽  
Pure Aluminum ◽  
Aluminum Matrix ◽  
Longitudinal Direction ◽  
Aluminum Matrix Composite ◽  
Ceramic Fiber ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Specific Strength

Abstract This pure aluminum matrix composite contains 60 volume% alumina. The aluminum ceramic fiber is Nextel 610. The fiber effects the longitudinal direction, resulting in a high longitudinal specific modulus and a specific strength with good off-axis properties. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and compressive and shear strength. It also includes information on corrosion resistance as well as casting. Filing Code: AL-344. Producer or source: 3M.

Drilling Characteristics of SiC Particle Reinforced Aluminum-Matrix Composites with Ultrasonic Vibration

2010 ◽  
Vol 455 ◽  
pp. 302-306 ◽  
Author(s):  
Xing Xin Xu ◽  
Xiao Hui Zhang ◽  
Chuan Shao Liu ◽  
Bo Zhao
Keyword(s):  
Surface Quality ◽  
Ultrasonic Vibration ◽  
Rapid Development ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composites ◽  
Drilling Process ◽  
Matrix Composites ◽  
Drilling Force ◽  
Vibration Drilling ◽  
Sic Particle

With the rapid development of aviation at home, particle reinforced metal matrix composites (PRMMCs) has been widely applied recently. But at the same time, the difficult machining has gradually been one of the most outstanding bottle-necks that restrict the rapid enhancement of productivity. Here, in virtue of the self-developed ultrasonic drilling equipment, hole-making experiments of common and ultrasonic vibration drilling are performed on SiC particle reinforced aluminum-matrix composites （SiCp/Al）with different content of SiC by using two types of tungsten carbide drill. Drilling characteristics of machining composites with ultrasonic vibration are analyzed from such respects as the composites crush, drilling force, drill wear and hole surface quality. Studies show that, during the ultrasonic vibration drilling process, SiC particle in the composites is prone to break along the crystal connection boundary or suffer ductile fracture under the dynamic ultrasonic impulse, in which the cutting resistance could be reduced and the tool edge could be protected. Thereby, drilling locating precision and hole surface quality could be enhanced, wear of the drill chisel edge effectively improved, and the drilling torque reduced about 30%.

Microstructure and Properties of SiC Particle Reinforced Aluminum Matrix Composites by Powder Metallurgy Method

2013 ◽  
Vol 457-458 ◽  
pp. 131-134 ◽  
Author(s):  
Tao Fan ◽  
Cong Li Xiao ◽  
Yan Rong Sun ◽  
Hong Bo Li
Keyword(s):  
Particle Size ◽  
Wear Resistance ◽  
Powder Metallurgy ◽  
Sintering Temperature ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composites ◽  
Average Particle ◽  
Particle Sizes ◽  
Matrix Composites ◽  
Sic Particle

The aim of this study is to investigate the effect of SiC particle pretreatment, aluminum matrix particle size and sintering temperature on relative density, hardness, microstructure and wear resistance to SiC particle einforced aluminum matrix composites. To this end, the amount of 16.7 wt.% SiC with average particle sizes 20μm was used along with pure aluminum of average particle size of 75 μm and 25μm. Powder metallurgy is a method used in the fabrication of this composite in which the powders were mixed using a planetary ball mill. By analyzing SEM micrograph and the Property test, it is concluded that SiC particle pretreatment has significant effect on the morphology of pecimens. pretreatment increase the interface adhesion, improve the wettability. SiC is uniformly distributed in the matrix, with good relation to the substrate, the maximum hardness is 51.1HB, the minimum wear rate is 0.1684%, while the density is 97.3%.For the same SiC content and particle size, the smaller the particle size of aluminum matrix is, the higher wear resistance of composite materials is on condition that others are same, the higher sintering temperature and the higher the wearability of composites, the wear resistance of the composite material is significantly improved after SiC pre-processing.The relative density increases with increasing aluminum matrix particle sizes under the same pressure and the holding time. The actual density of all samples reached the theoretical density over 96%, to a maximum of 98.9%.

Friction and Wear Properties of Aluminum Matrix Composites and its Application

2007 ◽  
Vol 351 ◽  
pp. 147-150
Author(s):  
Qiu Bao Ouyang ◽  
H.L. Gu ◽  
W.L. Wang ◽  
Di Zhang ◽  
Guo Ding Zhang
Keyword(s):  
Friction And Wear ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Wear Properties ◽  
Braking Performance ◽  
Brake Pressure ◽  
Friction And Wear Properties ◽  
Sic Composites ◽  
Sic Particle

Friction and wear properties of aluminum matrix composites are studied, including brake speed, brake pressure, and surface temperature etc. A conclusion can be drawn that SiC particle reinforced aluminum matrix composites are of stable friction coefficient, high thermal conductivity, and excellent wear-resistance. Hubs of motorcycle with brake rings of Al/SiC composites were manufactured and exhibited an excellent braking performance.

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