scholarly journals Research on the grinding performance of high pressure sintering SiCp/Al matrix composites

2018 ◽  
Vol 38 (2) ◽  
pp. 175-181
Author(s):  
Zhiru Chen ◽  
Yukun Hu
Keyword(s):  
High Pressure ◽  
Volume Fraction ◽  
Matrix Composites ◽  
Large Area ◽  
Grinding Performance ◽  
Sic Particles ◽  
Al Composite ◽  
High Pressure Sintering ◽  
Al Matrix Composites ◽  
Sintering Method

The two-dimensional vertical grinding test equipment was used to grind SiCp/Al composites which were prepared by high pressure sintering method. The SEM observation of grinding morphology showed that grinding damage can be prevented by SiC particles reinforcement, 60% volume fraction of SiC particles of SiCp/Al composite can hinder grinding depth and grinding performance was improved with the sintering pressure and temperature increasing. In addition, some scratches and exfoliated pits of SiC particles were observed on the surface of 60% volume SiCp/Al composite as the increase of grinding grain, while the depth of these scratches was shallower, there was no large area exfoliated pits of SiC reinforcements.<br>

Experimental Investigation on Ultrasonic Assisted Grinding of High Volume Fraction SiC Particles Reinforced Al Matrix Composites

2012 ◽  
Vol 565 ◽  
pp. 142-147 ◽  
Author(s):  
Z.G. Dong ◽  
F.J. Ma ◽  
Ren Ke Kang ◽  
K. Su
Keyword(s):  
Volume Fraction ◽  
High Volume ◽  
High Volume Fraction ◽  
Matrix Composites ◽  
Ultrasonic Assisted Grinding ◽  
Sic Particles ◽  
Al Composite ◽  
Ultrasonic Assisted ◽  
Al Matrix Composites ◽  
Material Removal Mode

The surface integrity of the machined components of the high volume fraction SiC particle reinforced Al composites (SiCp/Al) is important as it influences the performance of the part. The grinding experiments of 55% volume fraction SiC particles reinforced Al composite with and without ultrasonic-assisted were performed. The grinding forces were tested, on which the effects of the grinding parameters were analyzed. The surface topography of SiCp/Al after ultrasonic assisted grinding were observed, based on which the material removal mode was discussed.

scholarly journals Study of the Microstructure and Ring Element Segregation Zone of Spray Deposited SiCp/7055Al

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1299 ◽  
Author(s):  
Hao Yang ◽  
Xin-wei She ◽  
Bin-bin Tang ◽  
Chun-mei Li ◽  
Xian-quan Jiang
Keyword(s):  
Volume Fraction ◽  
Spray Deposition ◽  
Optical Microscope ◽  
Matrix Composites ◽  
Pinning Effect ◽  
Sic Particles ◽  
Transmission Electron ◽  
Al Matrix Composites ◽  
Element Enrichment ◽  
Al Matrix

Composites of 7055 aluminum (Al) matrix reinforced with SiC particles were prepared using the spray deposition method. The volume fraction of the phase reinforced with SiC particles was 17%. The effect of the introduction of SiC particles on the deposited microstructure and properties of the composites was studied in order to facilitate the follow-up study. The structure and element enrichment zone of spray-deposited SiCp/7055 Al matrix composites were studied by Optical Microscope (OM), X-ray diffraction (XRD), Scanning Electronic Microscopy (SEM) and Transmission electron microscopy (TEM). The results show that the reinforcement phases of the SiC particles were uniformly distributed on the macro and micro levels, and a few SiC particles were segregated into annular closed regions. C and Si on the surface of SiC particles diffused to the Al matrix. The distribution of the two elements was gradient weakening with SiC particles as the center, and the enrichment zones of Si, Mg and Cu formed in the middle of the closed annular area of a few SiC particles. The enrichment zones were mainly composed of alpha-Al, SiC, Al2CuMg, Al2Cu and MgZn2. AlCu and AlMgCu phase precipitate on the surface of the SiC particles, beside the particle boundary, and had the characteristics of preferred nucleation. They tended to grow at the edges and corners of SiC particles. It was observed that the formation of nanoparticles in the alloy had a pinning effect on dislocations. The different cooling rates of the SiC particles and the Al matrix led to different aluminum liquid particle sizes, ranging from 20 to 150 μm. In the region surrounded by SiC particles, the phenomenon of large particles extruding small particles was widespread. Tearing edges and cracks continued to propagate around the SiC particles, increasing their propagation journey and delaying the fracture of the materials.

Fabrication by SPS and Thermophysical Properties of High Volume Fraction SiCp/Al Matrix Composites

2006 ◽  
Vol 313 ◽  
pp. 171-176 ◽  
Author(s):  
X.F. Gu ◽  
Lian Meng Zhang ◽  
Mei Jun Yang ◽  
Dong Ming Zhang
Keyword(s):  
Thermophysical Properties ◽  
Volume Fraction ◽  
Coefficient Of Thermal Expansion ◽  
High Volume ◽  
High Volume Fraction ◽  
Matrix Composites ◽  
Sic Particles ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Al Matrix Composites

SiCp/Al composites containing high volume fraction of SiC particles were fabricated by spark plasma sintering (SPS), and their thermophysical properties, such as thermal conductivity (TC) and coefficient of thermal expansion (CTE), were characterized. High relative density (R-D) of composites was successfully achieved through the optimization of sintering parameters, such as sintering temperature, sintering pressure and heating rate. The measured TCs of SiCp/Al composites fabricated by SPS are higher than 195W/m.k, no matter the volume fraction of SiC particles is high or low as long as the R-D is higher than 95%. The measured CTEs of SiCp/Al composites are in good agreement with the estimated values based on Kerner,s model. The high volume fraction of SiCp/Al composites are a good candidate material to substitute for conventional thermal management materials in advanced electronic packages due to its tailorable thermophysical properties.

Thermal Properties of Al/Diamond Composites Fabricated in Continuous Solid-Liquid Co-Existent State by SPS

2012 ◽  
Vol 706-709 ◽  
pp. 1967-1972 ◽  
Author(s):  
Kiyoshi Mizuuchi ◽  
Kanryu Inoue ◽  
Yasuyuki Agari ◽  
Yoshiaki Morisada ◽  
Masami Sugioka ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Volume Fraction ◽  
Diamond Particle ◽  
Matrix Composites ◽  
Plasma Sintering ◽  
Al Composite ◽  
Al Matrix Composites ◽  
Diamond Powders ◽  
Solid Liquid ◽  
Al Matrix

Diamond-particle-dispersed-aluminum (Al) matrix composites were fabricated in continuous solid-liquid co-existent state by spark plasma sintering (SPS) process from the mixture of diamond powders, pure Al powders and Al-5mass%Si alloy powders. The microstructures and thermal conductivities of the composites fabricated were examined. These composites were well consolidated by heating at a temperature range between 798K and 876K for 1.56ks during SPS process. No reaction at the interface between the diamond particle and the Al matrix was observed by scanning electron microscopy for the composites fabricated under the sintering conditions employed in the present study. The relative packing density of the diamond-Al composite fabricated was 99% or higher in a volume fraction range of diamond between 45% and 50%. Thermal conductivity of the diamond-Al composite containing 50 vol.% diamond reached 552W/mK, approximately 95% the theoretical thermal conductivity estimated using Maxwell-Eucken’s equation.

scholarly journals Analysis of creep behavior of SiC/Al metal matrix composites based on a generalized shear-lag model

2004 ◽  
Vol 19 (12) ◽  
pp. 3633-3640 ◽  
Author(s):  
Ho J. Ryu ◽  
Kyung H. Chung ◽  
Seung I. Cha ◽  
Soon H. Hong
Keyword(s):  
Effective Stress ◽  
Volume Fraction ◽  
Matrix Composites ◽  
Shear Lag ◽  
Shear Lag Model ◽  
Sic Particles ◽  
Al Composite ◽  
The Matrix ◽  
Lag Model

The creep behaviors of 20 vol% SiCw/2124Al, extruded with different ratios, and SiCp/2124Al, reinforced with 10–30 vol% SiC particles, were investigated to clarify the effects of aspect ratio, alignment, and volume fraction of reinforcement on creep deformation. The effective stresses on the matrix of SiC/Al composites are calculated based on the generalized shear-lag model. The minimum creep rates of SiCw/2124Al extruded with different ratios and SiCp/2124Al reinforced with different volume fractions of SiC particles are found to be similar under a same effective stress on matrix, which is calculated by the generalized shear-lag model. The subgrain sizes in matrices of crept SiC/Al composites are dependent on the effective stress on matrix but not on the applied stress on the composite. It is suggested that the role of SiC reinforcements is to increase the creep resistance of SiC/Al composite by reducing the effective stress on matrix.

MICROSTRUCTURE AND PROPERTIES OF SiC PARTICLES REINFORCED COPPER BASED ALLOY COMPOSITE

2013 ◽  
Vol 27 (19) ◽  
pp. 1341025 ◽  
Author(s):  
YU HONG ◽  
XIAOLI CHEN ◽  
WENFANG WANG ◽  
YUCHENG WU
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Relative Density ◽  
Volume Fraction ◽  
Copper Matrix ◽  
Matrix Composites ◽  
Wear Properties ◽  
Sic Particles ◽  
Copper Based Alloy

Copper-matrix composites reinforced with SiC particles are prepared by mechanical alloying. The microstructure characteristics, relative density, hardness, tensile strength, electrical conductivity, thermal conductivity and wear properties of the composites are investigated in this paper. The results indicate that the relative density, macro-hardness and mechanical properties of composites are improved by modifying the surface of SiC particles with Cu and Ni . The electrical conductivity and thermal conductivity of composites, however, are not obviously improved. For a given volume fraction of SiC , the Cu / SiC ( Ni ) has higher mechanical properties than Cu / SiC ( Cu ). The wear resistance of the composites are improved by the addition of SiC . The composites with optimized interface have lower wear rate.

Effect of Annealing on Ferroelectric Properties of Nanometre BaTiO 3 Ceramics Prepared by High Pressure Sintering Method

2007 ◽  
Vol 24 (1) ◽  
pp. 244-247 ◽  
Author(s):  
Li Peng-Fei ◽  
Jin Chang-Qing ◽  
Xiao Chang-Jiang ◽  
Wang Feng-Ping ◽  
Wang Xiao-Hui ◽  
...  
Keyword(s):  
High Pressure ◽  
Ferroelectric Properties ◽  
High Pressure Sintering ◽  
Sintering Method

scholarly journals Utilization of SiC and Cu Particles to Enhance Thermal and Mechanical Properties of Al Matrix Composites

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2770 ◽  
Author(s):  
Dongxu Wu ◽  
Congliang Huang ◽  
Yukai Wang ◽  
Yi An ◽  
Chuwen Guo
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
High Thermal Conductivity ◽  
Low Density ◽  
Matrix Composites ◽  
Thermal And Mechanical Properties ◽  
Cu Content ◽  
Sic Particles ◽  
Al Matrix Composites ◽  
Al Matrix

In this work, SiC and Cu particles were utilized to enhance the thermal and mechanical properties of Al matrix composites. The ball-milling and cold-compact methods were applied to prepare Al matrix composites, and the uniform distribution of SiC and Cu particles in the composite confirms the validity of our preparation method. After characterizing the thermal conductivity and the compressibility of the prepared composites, results show that small particles have a higher potential to improve compressibility than large particles, which is attributed to the size effect of elastic modulus. The addition of SiC to the Al matrix will improve the compressibility behavior of Al matrix composites, and the compressibility can be enhanced by 100% when SiC content is increased from 0 to 30%. However, the addition of SiC particles has a negative effect on thermal conductivity because of the low thermal conductivity of SiC particles. The addition of Cu particles to Al-SiC MMCs could further slightly improve the compressibility behavior of Al-SiC/Cu MMCs, while the thermal conductivity could be enhanced by about 100% when the Cu content was increased from 0 to 30%. To meet the need for low density and high thermal conductivity in applications, it is more desirable to enhance the specific thermal conductivity by enlarging the preparation pressure and/or sintering temperature. This work is expected to supply some information for preparing Al matrix composites with low density but high thermal conductivity and high compressibility.

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