scholarly journals Effect Of SiC Particles On Sinterability Of Al-Zn-Mg-Cu P/M Alloy

2015 ◽  
Vol 60 (2) ◽  
pp. 1383-1385 ◽  
Author(s):  
H. Rudianto ◽  
G.J. Jang ◽  
S.S. Yang ◽  
Y.J. Kim ◽  
I. Dlouhy
Keyword(s):  
Alloy Powder ◽  
Volume Fraction ◽  
Compaction Pressure ◽  
High Volume ◽  
Liquid Phase Sintering ◽  
Chemical Compositions ◽  
Sic Particles ◽  
Powder Sintering ◽  
Ultra High Purity ◽  
Dual Action

Abstract Premix Al-5.5Zn-2.5Mg-0.5Cu alloy powder was analyzed as matrix in this research. Gas atomized powder Al-9Si with 20% volume fraction of SiC particles was used as reinforcement and added into the alloy with varied concentration. Mix powders were compacted by dual action press with compaction pressure of 700 MPa. High volume fraction of SiC particles gave lower green density due to resistance of SiC particles to plastic deformation during compaction process and resulted voids between particles and this might reduce sinterability of this mix powder. Sintering was carried out under ultra high purity nitrogen gas from 565°-580°C for 1 hour. High content of premix Al-5.5Zn-2.5Mg-0.5Cu alloy powder gave better sintering density and reached up to 98% relative. Void between particles, oxide layer on aluminum powder and lower wettability between matrix and reinforcement particles lead to uncompleted liquid phase sintering, and resulted on lower sintering density and mechanical properties on powder with high content of SiC particles. Mix powder with wt90% of Alumix 431D and wt10% of Al-9Si-vf20SiC powder gave higher tensile strength compare to another mix powder for 270 MPa. From chemical compositions, sintering precipitates might form after sintering such as MgZn2, CuAl2 and Mg2Si. X-ray diffraction, DSC-TGA, and SEM were used to characterize these 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.

scholarly journals Study on Meso-scale Grinding Surface Roughness and Sub-surface Quality of High Volume Fraction SiCp/Al2024 composites

2021 ◽  
Author(s):  
Guangyan Guo ◽  
Qi Gao ◽  
Quanzhao Wang ◽  
Yuanhe Hu
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Volume Fraction ◽  
Aluminum Matrix ◽  
High Volume ◽  
High Volume Fraction ◽  
Aluminum Matrix Composites ◽  
Sic Particles ◽  
Meso Scale

Abstract In order to improve the surface grinding quality of high volume fraction aluminum matrix composites, the cutting tool models with different rake angles are established, the grinding process is simulated, and the material removal mechanism and the broken state of SiC particles are obtained. Through single factor experiment, the 60% volume fraction SiCp/Al2024 composites are ground by diamond grinding rod with 3mm diameter, the surface roughness (Ra) is measured, and the surface and sub-surface quality of SiCp/Al2024 composites with meso-scale grinding is investigated. Meanwhile, the influence mechanism of grinding depth (ap) on surface quality is put forward, and the influence of different grinding depth on the fragmentation of SiC particles in sub-surface layer is discussed, which verifies the correctness of grinding simulation. The relevant research and theoretical model are of great significance to the study of grinding properties of composite materials.

Vacuum brazing of high volume fraction SiC particles reinforced aluminum matrix composites

2015 ◽  
Vol 29 (06n07) ◽  
pp. 1540002 ◽  
Author(s):  
Dongfeng Cheng ◽  
Jitai Niu ◽  
Zeng Gao ◽  
Peng Wang
Keyword(s):  
Electron Microscopy ◽  
Volume Fraction ◽  
Aluminum Matrix ◽  
High Volume ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Alloy Matrix ◽  
Vacuum Brazing ◽  
Sic Particles ◽  
A356 Aluminum

This experiment chooses A356 aluminum matrix composites containing 55% SiC particle reinforcing phase as the parent metal and Al – Si – Cu – Zn – Ni alloy metal as the filler metal. The brazing process is carried out in vacuum brazing furnace at the temperature of 550°C and 560°C for 3 min, respectively. The interfacial microstructures and fracture surfaces are investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy spectrum analysis (EDS). The result shows that adequacy of element diffusion are superior when brazing at 560°C, because of higher activity and liquidity. Dislocations and twins are observed at the interface between filler and composite due to the different expansion coefficient of the aluminum alloy matrix and SiC particles. The fracture analysis shows that the brittle fracture mainly located at interface of filler and composites.

A Study on the SiC/Al Composites Fabricated by Pressureless Infiltration

2008 ◽  
Vol 569 ◽  
pp. 189-192
Author(s):  
Ke Zheng Sang ◽  
Chun Feng Wan
Keyword(s):  
Particle Size ◽  
Volume Fraction ◽  
High Volume ◽  
High Volume Fraction ◽  
Pressureless Infiltration ◽  
Green Body ◽  
Sic Particles

SiC/Al composites with high volume fraction of SiC were prepared at 1150°C by pressureless infiltration. The volume fraction of SiC was increased by decreasing the amount of starch in the green body. Both the microstructure and the strength of the composites were investigated. The results showed that the strength decreased with the increasing of the particle size and volume fraction of SiC. It was suggested that the interface between the SiC particles, which were not sintered, make of the defects in the composites. The defects led to the decreasing of the strength with increasing of the volume fraction of SiC.

Drilling of SiCp/Al Composites with Electroplating Diamond Drills

2012 ◽  
Vol 723 ◽  
pp. 322-325
Author(s):  
Li Zhou ◽  
Shu Tao Huang ◽  
Da Shan Bai ◽  
Li Fu Xu
Keyword(s):  
Surface Roughness ◽  
Consumer Goods ◽  
Volume Fraction ◽  
Cutting Speed ◽  
High Volume ◽  
High Volume Fraction ◽  
Drilling Force ◽  
Engineering Applications ◽  
Large Size ◽  
Sic Particles

SiCp/Al composites have been used in a number of engineering applications including the consumer goods. However, the machining of these materials is very difficult because of the abrasive characteristics of the reinforced particulates. In this paper drilling studies on SiCp/Al composites with high volume fraction and large size SiC particles have been conducted by using electroplating diamond drills, and the influences of the cutting speed on the drilling force and surface roughness were investigated.

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.

Low Temperature Route to Cordierite Ceramics Using a Reactive Liquid Phase Sintering Aid. Dense Body Preparation and Green Tape Fabrication

1989 ◽  
Vol 154 ◽  
Author(s):  
Ryan W. Dupon ◽  
Richard L. Mcconville ◽  
Mark S. Thompson
Keyword(s):  
Bismuth Oxide ◽  
Volume Fraction ◽  
Dense Body ◽  
High Volume ◽  
Liquid Phase Sintering ◽  
Thermal Coefficient ◽  
Solids Loading ◽  
Reactive Liquid ◽  
Cordierite Ceramics ◽  
Precursor Powders

AbstractBismuth oxide has been found to be a useful flux for the preparation of dense body cordierite (Mg2Al4Si5O18). The use of as little as 2 atom% bismuth ion with the appropriate mixture of commercially available oxide starting materials serves to produce fully dense crystalline cordierite after firing at 1000 °C. The microstructure of the sintered body (92 w/o% cordierite, 8 w/o% bismuth oxide) has the residual bismuth oxide flux distributed in discontinuous domains at the grain boundaries and at the triple points. Physical properties such as thermal coefficient of expansion and dielectric constant are largely unperturbed by the presence of the flux.Green tapes having high volume fraction solids loading have been fabricated from bismuth oxide-cordierite precursor powders. The subsequent firing at 1000 °C of laminated green tapes yields fully dense ceramic bodies of crystalline cordierite.

Microstructure and Properties of a 70vol.% SiCp/Al-12Si Composite for Electronic Packaging

2005 ◽  
Vol 475-479 ◽  
pp. 881-884 ◽  
Author(s):  
Q. Zhang ◽  
Zi Yang Xiu ◽  
Mei Hui Song ◽  
Gao Hui Wu
Keyword(s):  
Electronic Packaging ◽  
Volume Fraction ◽  
Annealing Treatment ◽  
High Volume ◽  
Reaction Products ◽  
Thermal Residual Stresses ◽  
Sic Particles ◽  
Nucleation Sites ◽  
The Matrix ◽  
Conduction Properties

For the purpose of electronic packaging applications, a homogenous and void free 4032Al (Al-12wt.%Si) matrix composite with 70vol.% SiC particles was fabricated by squeeze casting technology. TEM observations indicated that SiC particles acted as heterogeneous nucleation sites for Si phases in the matrix and the SiC-Al interfaces were clean and free from any interfacial reaction products. The composite possessed lower coefficients of thermal expansion (CTEs) and excellent thermal conduction properties, and the CTEs could be further reduced by annealing treatment because of the alteration of original thermal residual stresses within the specimens. The incorporation of high volume fraction of SiC particles also induced enhanced mechanical properties for the composite, and its moduli even exceeded 200GPa. Some diodes were finally produced with nickel plated SiCp/Al baseplates and the results of thermal cycling tests between -55ı and 150ıfor these diodes were presented.

scholarly journals Study On The Edge Defects of High Volume Fraction 70% SiCp/Al Composites In Ultrasonic-Assisted Milling

2021 ◽  
Author(s):  
Peicheng Peng ◽  
Daohui Xiang ◽  
Xiaofei Lei ◽  
Zhanli Shi ◽  
Bo Li ◽  
...  
Keyword(s):  
Finite Element ◽  
Volume Fraction ◽  
Experimental Tests ◽  
High Volume ◽  
High Volume Fraction ◽  
Milling Force ◽  
Sic Particles ◽  
Ultrasonic Assisted ◽  
Edge Defects ◽  
Edge Quality

Abstract Directing at the hard machinability of high volume fraction 70% SiCp/Al composites，a longitudinal and torsional ultrasonic-assisted milling method is proposed to improve the edge quality and machining efficiency. By observing the metallographic structure of the material, the three-dimensional finite element model of SiC particles with spherical, ellipsoidal and random polyhedra is established and analyzed by ABAQUS simulation software. The formation mechanism of edge defects, stress distribution, defect characteristics and the effect of machining parameters on milling force are investigated during ultrasonic-assisted milling. The results show that the edge defects appear at the inlet, outlet and middle edge position, especiallyis more serious at the outlet position. The SiC particles failure modes mainly include particle pullout, particle shearing, crushing, and the edge defects mainly include matrix tearing, edge breakage, burrs, bulgesandpits. In a certain range of ultrasonic amplitude, ultrasonic-assisted milling can effectively reduce the surface fragmentation rate and milling force, slow down the expansion of cracks, increase the plastic flow of material, and obtain better edge quality compared with traditional machining method. By comparing the results of finite element simulation and experimental tests, it shows that the simulation results are in good agreement with the experimental tests.

scholarly journals Investigation on the removal characteristics of single-point cutting high-volume fraction SiCp/Al composites

2021 ◽  
Author(s):  
Yongjie Bao ◽  
Xu Zhang ◽  
Shouxiang Lu ◽  
Hongzhe Zhang
Keyword(s):  
Aluminum Alloy ◽  
Surface Quality ◽  
Volume Fraction ◽  
Single Point ◽  
Aluminum Matrix ◽  
High Volume ◽  
Aluminum Matrix Composites ◽  
Interface Debonding ◽  
Machined Surface ◽  
Sic Particles

Abstract SiC reinforced aluminum matrix composites (SiCp/Al composites) are typical difficult-to-machine material, and the irregular SiC particles diffused in SiCp/Al composites make the surface quality worse. In this paper, a single-point cutting investigations with finite element simulation were conducted for 65% SiCp/Al composites and aluminum alloy. The surface morphology characteristics of SiCp/Al composites, which mainly include breaking, part breaking, pulling out, protruding, al tearing, and interface debonding, are different from those of aluminum alloy materials. The high-volume SiC particles lower the surface quality and profile dimensional accuracy of SiCp/Al composites. There are thin and discrete layers covered on the machined surface.

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