Preparation and Thermal-Physical Properties of Three Dimensional Bicontinuous SiC/Cu-Si Composite

2014 ◽  
Vol 804 ◽  
pp. 187-190 ◽  
Author(s):  
Kuo Zhang ◽  
Hong Yan Xia ◽  
Bo Wang ◽  
Zhong Qi Shi ◽  
Xiang Zhao Zhang ◽  
...  
Keyword(s):  
Physical Properties ◽  
Coefficient Of Thermal Expansion ◽  
Three Dimensional ◽  
Cu Alloy ◽  
Sic Ceramic ◽  
3D Network ◽  
Spontaneous Infiltration ◽  
Bicontinuous Structure ◽  
Porous Sic ◽  
Thermo Physical Properties

A three dimensional (3D) SiC/Cu-Si composite with bicontinuous structure was fabricated by spontaneous infiltration method, using porous recrystallized SiC ceramic with porosity of 37% as 3D network reinforcement and Cu alloy (Cu-18Si) as matrix. The phase composition, microstructure, and thermo-physical properties of the as-prepared 3D-SiC/Cu-Si composite were investigated. The experimental results showed that the Cu-18Si alloy could fully penetrate into the porous SiC ceramic at 1600 °C for 2 h spontaneously. SiC and Cu15Si4 phases were identified in the as-prepared composites. The interfacial bond between SiC and Cu-Si alloy was tightly and no severe interfacial reaction was observed. The thermal conductivity and coefficient of thermal expansion of the as-prepared 3D-SiC/Cu-Si composite were changed from 89.8 to 55 W·m-1·K-1 and 7.512 to 9.64×10-6 °C-1 with the temperature increased from room temperature to 500 °C, respectively.

SiC/Cu Composite Prepared by Spontaneous Infiltration of Copper Alloy into Porous SiC Ceramic

2015 ◽  
Vol 814 ◽  
pp. 569-573
Author(s):  
Kuo Zhang ◽  
Zhong Qi Shi ◽  
Gui Wu Liu ◽  
Guan Jun Qiao
Keyword(s):  
Copper Matrix ◽  
Interfacial Bond ◽  
Influence Of Process Parameters ◽  
Infiltration Temperature ◽  
Sic Ceramic ◽  
Spontaneous Infiltration ◽  
Copper Matrix Composite ◽  
Prepared Composite ◽  
Porous Sic ◽  
Infiltration Behavior

A porous SiC ceramic reinforced copper-matrix composite was fabricated by spontaneous infiltration of molten Cu-24at%Si alloy into the reinforcement. The influence of process parameters on the infiltration behavior and microstructure of the as-prepared SiC/Cu composite investigations showed that infiltration temperature had an important influence on the infiltration behavior, and higher infiltration temperature which decreased the viscosity of molten Cu-24Si was beneficial to the penetration. Besides, the degree of infiltration increased with the increase of dwelling time at 1600°C. SiC particles were bonded together by sintering additives to form the porous reinforcement, which can be maintained after spontaneous infiltration. The interfacial bond between SiC and Cu-24Si alloy was tight, and no obvious interfacial reaction layer was observed in the as-prepared composite.

Thermo-physical properties of nonlinear optical crystal K3B6O10Br

2016 ◽  
Vol 49 (2) ◽  
pp. 539-543 ◽  
Author(s):  
Mingjun Xia ◽  
Bo Xu ◽  
Lijuan Liu ◽  
Xiaoyang Wang ◽  
Rukang Li ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Physical Properties ◽  
Specific Heat ◽  
Nonlinear Optical ◽  
Coefficient Of Thermal Expansion ◽  
Second Harmonic ◽  
Damage Threshold ◽  
Thermal Expansion Coefficients ◽  
Lower Temperature ◽  
Thermo Physical Properties

The thermo-physical properties of the nonlinear optical (NLO) crystal K3B6O10Br (KBB) were experimentally investigated, including specific heat, thermal conductivity, coefficient of thermal expansion and refractive index. The specific heat of KBB is lower than that of LiB3O5 and higher than that of other borate NLO crystals, such as β-BaB2O4, CsLiB6O10 and CsB3O5, and KBB manifests a high damage threshold because of its lower temperature gradient during laser pulse irradiation. The thermal expansion coefficients were obtained as α x = 5.09 × 10−6 K−1 and α z = 2.39 × 10−5 K−1, showing weaker anisotropy than those of commonly used NLO crystals. The temperature-dependent Sellmeier dispersion equations of the refractive indices were also obtained, and the phase-matching angles for second harmonic generation (SHG) at temperatures of 313, 343, 373, 403 and 433 K which were calculated from these equations are in good agreement with the experimental values. All results are indicative of the KBB crystal as a novel promising NLO crystal for high power SHG.

Enhancement of Cryosurgery Using Biodegradable MgO Nanoparticles

2012 ◽  
Author(s):  
Zhi Zhu He ◽  
De Rui Di ◽  
Jing Liu
Keyword(s):  
Numerical Simulation ◽  
Theoretical Analysis ◽  
Physical Properties ◽  
Thermal Effects ◽  
Numerical Study ◽  
Three Dimensional ◽  
Current Understanding ◽  
Target Tissue ◽  
Mgo Nanoparticles ◽  
Thermo Physical Properties

Presently an unavoidable defect in nano-cryosurgery is involved with the toxicity and biocompatibility of the foreign particles. Attempting to overcome the shortcomings mentioned above, based on our previous work, MgO nanoparticles have been used as a biodegradable and nontoxic agent in enhancing the nano-cryosurgery output. In this paper we present a three dimensional numerical study to investigate the significant thermal effects of MgO nanoparticles on the iceball evolution during cryosurgery of target tissue. Both of theoretical analysis and numerical simulation confirm that the excellent thermo-physical properties of MgO nanoparticles may be a quite important factor during iceball growth. This work may enhance current understanding of the factors for determining the effects of cryosurgery.

Influence of Mg and Si in the Aluminum on the Thermo-Physical Properties of Pressureless Infiltrated SiCp/Al Composites

2009 ◽  
Vol 610-613 ◽  
pp. 546-553 ◽  
Author(s):  
Xian Liang Zhou ◽  
Ai Hua Zou ◽  
Xiao Zhen Hua ◽  
Jian Yun Zhang
Keyword(s):  
Thermal Conductivity ◽  
Physical Properties ◽  
Molten Aluminum ◽  
Coefficient Of Thermal Expansion ◽  
Interface Reaction ◽  
Element Content ◽  
Pressureless Infiltration ◽  
Matrix Elements ◽  
Si Content ◽  
Thermo Physical Properties

SiCp/Al composites based on different matrix elements Mg and Si content were fabricated by pressureless infiltration. Through microscope investigation by SEM and TEM, density examination, coefficient of thermal expansion (CTE) and thermal conductivity measuring by Netzsch DIL 402EP and Netzsch LFA 447 Nanoflash, the effects of Mg and Si in the aluminum on the thermo-physical properties of SiCp/Al composites was studied and analysed. The results showed that , adding Mg element in matrix enhaced the densification and thermal conductivity of composites, but meanwhile increased the CTE of SiCp/Al composites. When Mg element content was in higher than 6.3wt%, CTE of SiCp/Al composites increased obviously. Adding Si element in matrix markedly reduced the CTE of composites , but meanwhile decreased thermal conductivity of composites. When Si element content was higher than 5-9wt%,thermal conductivity of composites declined obviously. Adding Mg element in matrix improved the interface wet ability between molten aluminum and SiC particles, and adding Si element in matrix could control the formation of A14C3 which is a detrimental interface reaction product during the pressureless infiltration processing. Therefore, adding appropriate Mg in company with Si in matrix will be more benefit to enhance the integer properties of SiCp/Al composites.

Microstructure and Thermo-Physical Properties of TiB2/Si-30Al Composite for Electronic Packaging Applications

2011 ◽  
Vol 687 ◽  
pp. 138-143 ◽  
Author(s):  
Gui Sheng Gan ◽  
Lei Zhang ◽  
Yi Lu ◽  
Bin Yang
Keyword(s):  
Thermal Expansion ◽  
Physical Properties ◽  
Coefficient Of Thermal Expansion ◽  
Hot Isostatic Pressing ◽  
Spray Forming ◽  
Alloy Matrix ◽  
Primary Si ◽  
Thermo Physical Properties ◽  
Scanning Electron

2wt.%TiB2/Si-30Al composite was prepared by in-situ reaction and spray forming first and then by hot isostatic pressing (HIP). The microstructure and thermo-physical properties of the composite were investigated by means of scanning electron microscopy, and thermal expansion analyzer respectively. The results show that the microstructure of the TiB2/Si-30Al composite consists of a continuous network of primary Si (~35μm), interpenetrating secondary Al phase, and fine TiB2particles (1~2μm). The TiB2particles were uniformly distributed in the Si-30Al alloy matrix. After HIP, the pores in the TiB2/Si-30Al composite were almost eliminated, and the relative density of the composite was up to 98.9%. The 2wt.%TiB2/Si-30Al composite after the HIP exhibits good thermo-physical properties, including lower coefficient of thermal expansion (CTE) (6.6´10-6×K-1) and higher thermal conductivity (84 W×m-1×K-1).

Thermo-Physical Properties of Ti-Coated Diamond/Al Composites Prepared by Pressure Infiltration

2010 ◽  
Vol 654-656 ◽  
pp. 2572-2575 ◽  
Author(s):  
Yang Zhang ◽  
Xi Tao Wang ◽  
Sen Bao Jiang ◽  
Jian Hua Wu
Keyword(s):  
Physical Properties ◽  
Volume Fraction ◽  
Coefficient Of Thermal Expansion ◽  
Metal Layer ◽  
Interfacial Bonding ◽  
Molten Salt Method ◽  
Pressure Infiltration ◽  
Diamond Particles ◽  
Interfacial Characteristic ◽  
Thermo Physical Properties

Thermo-physical properties of diamond reinforced Al composites were investigated. Volume fraction of diamond particles was up to 55%. In order to improve the interfacial bonding between diamond and aluminum, diamond particles were pre-coated with titanium using molten salt method. XRD and SEM observation showed that the Ti coating on diamond consists of carbide layer and metal layer, which mainly depend on temperature and time. The influences of the Ti coating on interfacial characteristic and the thermo-physical properties of the composites were studied. The interfacial characterization and thermal diffusivity measurements indicated that Ti coated diamond was more favorable on interfacial bonding and thermal properties. Ti coating on diamond resulted in an increase of thermal conductivity of the composites, from 200 to 430 W/mK along with a coefficient of thermal expansion of 6.40 × 10-6/K.

Effect of Diamond Shape on Thermal-Physical Properties of Diamond/Cu Composites

2015 ◽  
Vol 1095 ◽  
pp. 12-15
Author(s):  
Jian Hao Chen ◽  
Shu Bin Ren ◽  
Xin Bo He ◽  
Xuan Hui Qu
Keyword(s):  
Physical Properties ◽  
Volume Fraction ◽  
Coefficient Of Thermal Expansion ◽  
High Volume ◽  
Pressure Infiltration ◽  
Surface Areas ◽  
The Difference ◽  
Diamond Type ◽  
Thermo Physical Properties ◽  
Thermal Physical Properties

High volume fraction diamond/copper composites with different diamond shape were prepared by vacuum pressure infiltration. In this paper, the effect of diamond type on thermo-physical properties of the composites was researched. The results showed that the composites with broken diamond exhibited the lowest thermal conductivity and coefficient of thermal expansion, only 401W/m•k and 6.2×10-6m/K respectively, and the composites with monocrystalline diamond had the best properties, reaching to 527W/m•K and 8.3×10-6m/K respectively, and the properties of the composites with modified-shape diamond were in the middle. The difference in the properties of the composites with different-shape diamond is attributed to their various specific surface areas.

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