The Effect of SiC Particle Size on the Microstructure and Hardness of SiCp/Cu Composites

2014 ◽  
Vol 997 ◽  
pp. 442-445
Author(s):  
Ming Hu ◽  
Li Li Tang ◽  
Lin Shan ◽  
Yun Long Zhang
Keyword(s):  
Particle Size ◽  
Vickers Hardness ◽  
Copper Matrix ◽  
X Ray Diffraction ◽  
Chemical Plating ◽  
Hardness Tester ◽  
Sic Particles ◽  
Structure Morphology ◽  
Hot Press Sintering ◽  
Sic Particle

The chemical plating technology was applied in order to improve the weaker wettability between the copper and SiC particles for electronic packaging applications. The hot-press sintering technique was executed to fabricate SiCp/Cu composites. The influence of SiC particles size on the phase constitute, micro-structure morphology and vickers hardness were investigated in details by means of X-ray diffraction, scanning electron microscope and vickers hardness tester. The results showed that SiC particle were distributed in copper matrix uniformly and interface was clear. The relative density and vickers hardness of SiCp/Cu composites increased as SiC particle size enhanced.

An Experimental Investigation on Mechanical and Wear Properties of Al7075/SiCp Composites: Effect of SiC Content and Particle Size

2017 ◽  
Vol 140 (3) ◽  
Author(s):  
Thella Babu Rao
Keyword(s):  
Particle Size ◽  
Tensile Strength ◽  
Wear Resistance ◽  
Ultimate Tensile Strength ◽  
Matrix Material ◽  
Mechanical Tests ◽  
Experimental Investigations ◽  
Wear Properties ◽  
Sic Particles ◽  
Sic Particle

One of the major advantages of metal matrix composites (MMCs) is that their tailorable properties meet the specific requirements of a particular application. This paper deals with the experimental investigations done on the effects of the reinforcement particulate size and content on the Al7075/SiC composite. The composites were manufactured using stir casting technique. The effect of SiC particle size (25, 50, and 75 μm) and particulate content (5, 10, and 15 wt %) on the microstructural, mechanical properties, and wear rate of the composites was studied and the results were analyzed for varied conditions of reinforcement. Scanning electron microscope (SEM) examinations were used to assess the dispersion of SiC particles reinforced into the matrix alloy and was found with reasonably uniform with minimal particle agglomerations and with good interfacial bonding between the particles and matrix material. X-ray diffraction (XRD) analysis confirmed the presence of Al and SiC with the composite. The results of mechanical tests showed that the increasing SiC particle size and content considerably enhanced the ultimate tensile strength and hardness of the composites while the ductility at this condition was decreased. The highest ultimate tensile strength of 310 MPa and hardness of 126 BHN were observed for the composites containing 15 wt %. SiC at 75 μm. Lesser the wear resistance of the reference alloy while it was enhanced up to 40% with the composites. The wear resistance was increased up to 1200 m of sliding distance for all the composites, whereas for the composite containing 75 μm SiC particles, it was extended up to 1800 m.

scholarly journals Effect of SiC Particle Contents and Size on the Microstructure and Dissolution of SiC-Hydroxyapatite Coatings

Coatings ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1166
Author(s):  
Li Yang ◽  
Zuli Mao
Keyword(s):  
Weight Loss ◽  
Hydroxyapatite Coating ◽  
Carbon Composites ◽  
Bone Implant ◽  
Sic Particles ◽  
Hydroxyapatite Coatings ◽  
Dissolution Properties ◽  
Structure Morphology ◽  
Ultrasound Assisted ◽  
Sic Particle

Carbon/carbon composites, when used as bone implant materials, do not adhere well to the bone tissues because of their non-bioactive characteristics. Therefore, we electro-deposited SiC-hydroxyapatite coatings (with an ultrasound-assisted step) on carbon/carbon composites. We analyzed how the content and size of the SiC particles affected the structure, morphology, bonding strength and dissolution of the SiC-hydroxyapatite coatings. The hydroxyapatite coating dissolution properties were assessed by the released Ca2+ and the weight loss. The SiC-hydroxyapatite coating on naked carbon/carbon composites showed a more compact microstructure in comparison to the hydroxyapatite coating on carbon/carbon composites. The reasons for the changes in the microstructure and the improvement in the adhesion of the coatings on C/C were discussed. Moreover, the addition of SiC particles increased the binding strengths of the hydroxyapatite coating on C/C composite, as well as reduced the dissolution rate of the hydroxyapatite coating.

Preparation and Properties of Electroless Ni-P-β-SiC Composition Coating

2014 ◽  
Vol 809-810 ◽  
pp. 621-626
Author(s):  
Xiao Meng Zhang ◽  
Li Bin Niu ◽  
Xiao Cui Wei ◽  
Xiao Gang Wang ◽  
Xiao Hu Hua
Keyword(s):  
Composite Coating ◽  
Deposition Rate ◽  
Optimum Process ◽  
Process Conditions ◽  
X Ray Diffraction ◽  
Coating Deposition ◽  
Chemical Plating ◽  
Plating Method ◽  
Electroless Ni ◽  
Sic Particle

Through orthogonal test of Ni-P chemical plating process optimization to determine the optimum process recipe, the Ni-P-β-SiC composite coating were prepared by chemical plating method. The deposition rate, microhardness, composition and organization of Ni-P-β-SiC composite coating are observed and analyzed by scanning electron microscopy (SEM), vivtorinox microhardness tester, X ray diffraction (XRD) and energy spectrum analysis (EDS). The influences of β-SiC particle concentration in bath on the solution of composite coating deposition rate and microhardness. The results show that the influence of composite coating deposition rate and microhardness are NiSO4•6H2O, NaH2PO2•H2O, C3H6O3, and PH. The optimum process conditions: NiSO4•6H2O 25 g/L, NaH2PO2•H2O 27 g/L, C3H6O327 ml/L, PH 5.2. It was found that the Ni-P-β-SiC composite coating with 5g/Lβ-SiC particles exhibited a maximum deposition rate and microhardness, the deposition rate of composite coating is 12.32μm/h, microhardness is 567.93HV0.05.

Microstructure and Optical Properties of ZnS:Mn Nanocrystals

2013 ◽  
Vol 652-654 ◽  
pp. 192-196
Author(s):  
Jin Hua Ma ◽  
Chang Zheng Wang ◽  
Chang Yong Sun
Keyword(s):  
Particle Size ◽  
Optical Properties ◽  
Hexagonal Phase ◽  
Blue Shift ◽  
Emission Peak ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Strong Emission ◽  
Luminescence Peak ◽  
Structure Morphology

Abstract. By using Na2S•9H2O as source precursor and citric acid as stabilizer, ZnS:Mn nanocrystallines were synthesized by solvothermal method. They were annealed at 800 oC in the charcoal powder. The structure, morphology and optical properties were investigated by using X-ray diffraction spectra (XRD), scanning electron microscopy (SEM), and Spectrofluorophotometer respectively. The results showed that all unannealed ZnS:Mn nanocrystallines were about 3~5 nm of particle size and have cubic structure, and all annealed samples were about 30-70 nm of particle size and have mixed structure of the cubic phase and hexagonal phase. Moreover, Mn2+ took the place of Zn2+ in ZnS:Mn. With the increment of Mn2+ content, there occurred a strong emission peak at about 596nm which can be attributed to the Mn2 + leap from 4T1 to 6A1. In addition, the intensity of 596nm emission peak first increased and then decreased with the increment of Mn2+ content, reaching a maximum at about 15% of Mn2+ content. After annealing Mn2+ emission peak intensity is about 20 times that before annealing, and the luminescence peak also showed slightly blue shift.

Influences of SiC Particle Size and Content on the Mechanical Properties and Wear Resistance of the Composites with Al Matrix

2008 ◽  
Vol 375-376 ◽  
pp. 430-434 ◽  
Author(s):  
Yi Yi Tao ◽  
Xiao Lan Ge ◽  
Xiao Jing Xu ◽  
Zuo Jiang
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Tensile Strength ◽  
Wear Resistance ◽  
Wear Properties ◽  
Reinforcing Effect ◽  
Sic Particles ◽  
Al Matrix ◽  
Sic Particle

The SiCp/Al composites reinforced by SiC particles with various sizes and contents were prepared by cold compacting and subsequent hot extruding. The mechanical and wear properties of the compositions were investigated and the relevant mechanisms were discussed. It has been shown that the tensile strength and wear resistance increases with increasing SiCp content. SiC particles have a remarkable reinforcing effect on matrix Al. The composite with larger SiCp size (14μm) possesses better wear resistance than that with smaller SiCp size (130nm).

scholarly journals Crucial effect of SiC particles on in situ synthesized mullite whisker reinforced Al2O3-SiC composite during microwave sintering

2017 ◽  
Vol 11 (2) ◽  
pp. 106-112 ◽  
Author(s):  
Xudan Dang ◽  
Meng Wei ◽  
Rui Zhang ◽  
Keke Guan ◽  
Bingbing Fan ◽  
...  
Keyword(s):  
Particle Size ◽  
Flexural Strength ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Hot Spot ◽  
Microwave Sintering ◽  
Sic Particles ◽  
Shock Resistance ◽  
Sic Particle

Mullite whisker reinforced Al2O3-SiC composites were in situ synthesized by microwave sintering at 1500?C for 30min. The influence of SiC particle size on heating process and properties of Al2O3-SiC composite were investigated. The XRD and SEM techniques were carried out to characterize the samples. The thermal shock resistance and flexural strength of the samples were examined through water quenching and three-point bending methods, respectively. It was found that the bridging of mullite whisker appeared between Al2O3 and SiC particles which enhanced the thermal shock resistance. A so-called local hot spot effect was proposed dependent on the coupling of SiC particles with microwave, which was the unique feature of microwave sintering. The maximal thermal shock resistance and flexural strength were obtained for the samples with SiC particle size of ~5?m.

Effect of Spheroidizing Annealing Time on Microstructure and Hardness of GCr15 Bearing Steel

2012 ◽  
Vol 581-582 ◽  
pp. 928-931 ◽  
Author(s):  
Xiang Dong Huo ◽  
Lin Guo ◽  
Kuang Nian He ◽  
Rui Huang
Keyword(s):  
Particle Size ◽  
Vickers Hardness ◽  
Annealing Time ◽  
Bearing Steel ◽  
Hardness Tester ◽  
Prolonged Time ◽  
Gcr15 Bearing Steel ◽  
Microstructural Constituent ◽  
Spheroidizing Annealing

In order to shorten the spheroidizing annealing time, the effects of annealing time on microstructure and hardness of GCr15 have been researched by using OM, SEM and Vickers hardness tester. The original microstructural constituent of bearing steel is pearlite and cementite. Prolonged time at 805°Cwill decrease the number and increase size of cementite particles. After incomplete austenization at 805°C, prolonged time at 720°C induces increase of particle size, and uniform distribution of divorced pearlite. The hardness of specimens treated with different spheroidization process fluctuates around 200HV, and is equivalent to that with conventional spheroidization process. It is realizable to shorten the annealing time on the premise of good quality of bearing steel.

Effects of Particle Size and Distribution on the Microstructure and Mechanical Properties of SiC Reinforced Al-30Si Alloy Composite

2012 ◽  
Vol 271-272 ◽  
pp. 12-16 ◽  
Author(s):  
Zeng Lei Ni ◽  
Ai Qin Wang ◽  
Jing Pei Xie
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Tensile Strength ◽  
Physical Properties ◽  
Combined Effects ◽  
Alloy Composite ◽  
Microstructure And Mechanical Properties ◽  
Sic Particles ◽  
The Matrix ◽  
Sic Particle

This paper studied the combined effects of particle size and distribution on the mechanical properties of the SiC particle reinforced Al-30Si alloy composites. The microstructure of experimental material was analyzed by SEM, the tensile strength and physical properties were examined. The results show that, with the increase of the SiC particle size in the composites, the clustering degree of the SiC particles decreases in the matrix, the SiC particles distribute more ununiformly. The tensile strength is influenced by the SiC particle size, the tensile strength of the composite reinforced by 13μm sized SiC particles is the highest.

The Chemical Plating Copper of the SiC Particles and Thermal Expansion Behavior of the SiCp/Cu Composites

2013 ◽  
Vol 544 ◽  
pp. 334-338
Author(s):  
Ming Hu ◽  
Yun Long Zhang ◽  
You Jin Liu ◽  
Jing Gao
Keyword(s):  
Thermal Expansion ◽  
Pure Copper ◽  
Copper Matrix ◽  
Copper Plating ◽  
Chemical Plating ◽  
Thermal Expansion Coefficients ◽  
Sic Particles ◽  
Expansion Behavior ◽  
The Matrix

In this paper, the chemical copper plating technology was utilized to modify the SiC particles and the SiCp/Cu composites were fabricated by the pressure-less sintering technology. The effect of pretreatment solution on the coating quality of the SiC particles was discussed in details. The pure copper and copper- coated SiC particles or SiC particles without coated copper were used to fabricate the SiCp/Cu composites. At the same time, the microstructures and thermal expansion coefficients of the SiCp/Cu composites were studied. The results showed that the uniform and continuous Cu coating on the SiC particles can be obtained after chemical copper plating, and the copper-coated SiC particles can distributed continuously in the matrix of the SiCp/Cu composites. The chemical copper plating technology could improve the wettability between SiC particles and copper matrix obviously. The addition of the SiC particle could reduce the CTE of the SiCp/Cu composites.

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