Fabrication of Carbon Nano-Fiber / Aluminum Composites by Low-Pressure Infiltration Method

2010 ◽  
Vol 654-656 ◽  
pp. 2692-2695 ◽  
Author(s):  
Gen Sasaki ◽  
Yoshimasa Hara ◽  
Zhe Feng Xu ◽  
Kenji Sugio ◽  
Hiroshi Fukushima ◽  
...  
Keyword(s):  
Pure Aluminum ◽  
Applied Pressure ◽  
Low Pressure ◽  
Aluminum Composites ◽  
Pressure Infiltration ◽  
Porous Preform ◽  
Plasma Sintering ◽  
Nano Fiber ◽  
Spark Plasma ◽  
Infiltration Method

In this study, the fabrication of carbon containing aluminum composites was attempted by using low-pressure infiltration method. At first, porous preform containing vapor grown nano-fiber (VGCF) and pure aluminum powder was fabricated by spark plasma sintering (SPS) method. Porosity in preform was controlled by changing the applied pressure during plasma sintering. Consequently, the porous preform with 40-50vol％ in porosity was obtained, which has enough compression strength for low-pressure infiltration (<1MPa). Then, the molten pure aluminum infiltrated to porous preform with 0.4MPa in applied pressure at 1023K, and consequently we can obtain the composite with 62-86% in density. The electrical and thermal conductivity of composites was affected by the porosity, strongly.

Effective atomic diffusion coefficient dependence on applied pressure during spark plasma sintering

Materialia ◽  
2019 ◽  
Vol 6 ◽  
pp. 100334 ◽  
Author(s):  
X.X. Li ◽  
C. Yang ◽  
T. Chen ◽  
Z.Q. Fu ◽  
Y.Y. Li ◽  
...  
Keyword(s):  
Diffusion Coefficient ◽  
Spark Plasma Sintering ◽  
Applied Pressure ◽  
Atomic Diffusion ◽  
Plasma Sintering ◽  
Spark Plasma

Microstructure and Mechanical Properties of Spark-Plasma-Sintered SiC-TiC Composites

2005 ◽  
Vol 287 ◽  
pp. 335-339 ◽  
Author(s):  
Kyeong Sik Cho ◽  
Kwang Soon Lee
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Heating Rate ◽  
Spark Plasma Sintering ◽  
Sintering Temperature ◽  
Applied Pressure ◽  
Argon Atmosphere ◽  
Full Density ◽  
Plasma Sintering ◽  
Spark Plasma

Rapid densification of the SiC-10, 20, 30, 40wt% TiC powder with Al, B and C additives was carried out by spark plasma sintering (SPS). In the present SPS process, the heating rate and applied pressure were kept at 100°C/min and at 40 MPa, while the sintering temperature varied from 1600-1800°C in an argon atmosphere. The full density of SiC-TiC composites was achieved at a temperature above 1800°C by spark plasma sintering. The 3C phase of SiC in the composites was transformed to 6H and 4H by increasing the process temperature and the TiC content. By tailoring the microstructure of the spark-plasma-sintered SiC-TiC composites, their toughness could be maintained without a notable reduction in strength. The strength of 720 MPa and the fracture toughness of 6.3 MPa·m1/2 were obtained in the SiC-40wt% TiC composite prepared at 1800°C for 20 min.

Effects of Sintering Conditions on the Mechanical Properties of Alumina Particle Dispersed Magnesium SPS Compacts

2014 ◽  
Vol 783-786 ◽  
pp. 2433-2438 ◽  
Author(s):  
Shigehiro Kawamori ◽  
Hiroshi Fujiwara ◽  
Yukio Kasuga
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Alumina Particle ◽  
Applied Pressure ◽  
Powder Mixtures ◽  
Cooling Conditions ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Xrd And Tem ◽  
Main Factor

To enhance the mechanical properties of Mg alloys, 0-30vol% Al2O3/Mg powders were formed by ball milling powder mixtures of pure Mg and Al2O3 particles, and then Spark plasma sintering (SPS) compacts (Al2O3/Mg discs) were made by the Al2O3/Mg powders. The effect of the cooling conditions in the SPS process on the mechanical properties of the Al2O3/Mg discs was investigated. From the results of SEM, XRD and TEM-EDS, the microstructures of the Al2O3/Mg discs were identified to consist of α-Mg solid solution, Al2O3 particles, refined MgO particles and refined needle-like Mg17Al12 ( more than 20vol% Al2O3 content). The mechanical properties of the discs were able to control by the regulation of the cooling conditions (cooling rate (vc) and applied pressure in the cooling (pc)) in SPS process, and as a result, the SPS discs possessing the mechanical properties beyond HP compacts were obtained under the cooling conditions of “vc= 0.83K/sand pc = 20MPa”. Main factor that the cooling conditions in SPS process effect on the mechanical properties of the Al2O3/Mg discs are considered to be the compresive residual stress generated in the α - Mg solid solution by the thermal stress associated with deference of the coefficients of thermal expansion between the α - Mg and ceramics particles (Al2O3 and MgO) in the discs.

Low‐pressure fabrication of IR‐transparent Y 2 O 3 via spark plasma sintering

2016 ◽  
Vol 11 (11) ◽  
pp. 688-691 ◽  
Author(s):  
Elnaz Irom ◽  
Mohammad Zakeri ◽  
Ali Sedaghat Ahangari Hossein Zadeh ◽  
Saman Safian ◽  
Ali Rahbari
Keyword(s):  
Spark Plasma Sintering ◽  
Low Pressure ◽  
Plasma Sintering ◽  
Spark Plasma

Nanometric La0.9Sr0.1Ga0.8Mg0.2O3−x ceramic prepared by low-pressure reactive spark-plasma-sintering

2011 ◽  
Vol 509 (5) ◽  
pp. 2535-2539 ◽  
Author(s):  
H. Borodianska ◽  
P. Badica ◽  
T. Uchikoshi ◽  
Y. Sakka ◽  
O. Vasylkiv
Keyword(s):  
Spark Plasma Sintering ◽  
Low Pressure ◽  
Plasma Sintering ◽  
Spark Plasma

Infiltration of C/SiC composites with silica sol-gel solutions: Part II. Infiltration under isostatic pressure and oxidation resistance

1999 ◽  
Vol 14 (11) ◽  
pp. 4239-4245 ◽  
Author(s):  
Mario Aparicio ◽  
Alicia Durán
Keyword(s):  
Sol Gel ◽  
Applied Pressure ◽  
Process Variable ◽  
Solution Concentration ◽  
Silica Sol ◽  
Infiltration Process ◽  
Pressure Infiltration ◽  
C Fibers ◽  
Sic Composites ◽  
Infiltration Method

An infiltration process that uses silica sol-gel solutions was developed to protect C/SiC composites against oxidation. The infiltration is assisted using isostatic pressure. Different process parameters including substrate porosity and solution concentration and viscosity were varied to optimize the infiltration effectiveness. Applied pressure enhances penetration of solutions, reducing the importance of viscosity, an important process variable for dipping infiltration. The effectiveness of the isostatic pressure infiltration method, evaluated through the total weight gains and pore-size distribution of infiltrated samples, is compared with results of dipping infiltration. The oxidation behavior of the infiltrated samples, was evaluated by stepwise oxidation test as well as isothermal tests at 1200 and 1600 °C. The infiltrated SiO2 protects the C/SiC substrate, reducing the burnoff rate of C fibers at low temperature and delaying the oxidation of SiC.

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