Mechanical strength of ultra-fine Al-AlN composites produced by a combined method of plasma-alloy reaction, spray deposition and hot pressing

1993 ◽  
Vol 28 (16) ◽  
pp. 4398-4404 ◽  
Author(s):  
A. Inoue ◽  
K. Nosaki ◽  
B. G. Kim ◽  
T. Yamaguchi ◽  
T. Masumoto
Keyword(s):  
Mechanical Strength ◽  
Hot Pressing ◽  
Spray Deposition ◽  
Combined Method

Microstructure and properties of 50Si50Al alloy produced by spray deposition and hot pressing process

2019 ◽  
Vol 549 (1) ◽  
pp. 220-226
Author(s):  
Pengfei Chen ◽  
Guofa Mi ◽  
Youchao Wang ◽  
Changyun Li ◽  
Lei Xu ◽  
...  
Keyword(s):  
Hot Pressing ◽  
Spray Deposition ◽  
Microstructure And Properties ◽  
Pressing Process

Processing, mechanical properties and oxidation behavior of TaC and HfC composites containing 15 vol% TaSi2 or MoSi2

2009 ◽  
Vol 24 (6) ◽  
pp. 2056-2065 ◽  
Author(s):  
Diletta Sciti ◽  
Laura Silvestroni ◽  
Stefano Guicciardi ◽  
Daniele Dalle Fabbriche ◽  
Alida Bellosi
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
High Temperature ◽  
Mechanical Strength ◽  
Hot Pressing ◽  
Room Temperature ◽  
Oxidation Behavior ◽  
Temperature Stability ◽  
High Temperature Stability ◽  
Better Than

Fully dense HfC and TaC-based composites containing 15 vol% TaSi2 or MoSi2 were produced by hot pressing at 1750–1900 °C. TaSi2 enhanced the sinterability of the composites and nearly fully dense materials were obtained at lower temperatures than in the case of MoSi2-containing ones. The TaC-based composites performed better than HfC composites at room temperature, showing values of mechanical strength up to 900 MPa and a fracture toughness of 4.7 MPa·m1/2. However, preliminary oxidation tests carried out in air at 1600 °C revealed that HfC-based composites have a superior high temperature stability compared to TaC-based materials.

scholarly journals Enhancement of Physical Characteristics of Styrene–Acrylonitrile Nanofiber Membranes Using Various Post-Treatments for Membrane Distillation

Membranes ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 969
Author(s):  
Reza Sallakhniknezhad ◽  
Manijeh Khorsi ◽  
Ali Sallakh Niknejad ◽  
Saeed Bazgir ◽  
Ali Kargari ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Pore Size ◽  
Hot Pressing ◽  
Welding Process ◽  
Membrane Distillation ◽  
Solvent Vapor ◽  
Synthetic Seawater ◽  
Nanofiber Membranes ◽  
Styrene Acrylonitrile ◽  
Welding Processes

Insufficient mechanical strength and wide pore size distribution of nanofibrous membranes are the key hindrances for their concrete applications in membrane distillation. In this work, various post-treatment methods such as dilute solvent welding, vapor welding, and cold-/hot-pressing processes were used to enhance the physical properties of styrene–acrylonitrile (SAN) nanofiber membranes fabricated by the modified electrospinning process. The effects of injection rate of welding solution and a working distance during the welding process with air-assisted spraying on characteristics of SAN nanofiber membranes were investigated. The welding process was made less time-consuming by optimizing system parameters of the electroblowing process to simultaneously exploit residual solvents of fibers and hot solvent vapor to reduce exposure time. As a result, the welded SAN membranes showed considerable enhancement in mechanical robustness and membrane integrity with a negligible reduction in surface hydrophobicity. The hot-pressed SAN membranes obtained the highest mechanical strength and smallest mean pore size. The modified SAN membranes were used for the desalination of synthetic seawater in a direct contact membrane distillation (DCMD). As a result, it was found that the modified SAN membranes performed well (>99.9% removal of salts) for desalination of synthetic seawater (35 g/L NaCl) during 30 h operation without membrane wetting. The cold-/hot-pressing processes were able to improve mechanical strength and boost liquid entry pressure (LEP) of water. In contrast, the welding processes were preferred to increase membrane flexibility and permeation.

Ferrous Ball-Milled Powders for the Fabrication of Sintered Diamond Tools

2014 ◽  
Vol 1052 ◽  
pp. 514-519 ◽  
Author(s):  
Janusz Konstanty ◽  
Andrzej Romanski ◽  
Dorota Tyrala
Keyword(s):  
Mechanical Strength ◽  
Hot Pressing ◽  
Milling Time ◽  
High Hardness ◽  
Free Condition ◽  
Iron Base ◽  
Diamond Tools ◽  
Sintered Diamond ◽  
Milled Powders

The work presents the possibility of application of inexpensive iron-base powders in the production of sintered diamond tools. It has been shown that ball-milled Fe-Ni-Cu-Sn-C and Fe-Mn-Cu-Sn-C powders can be consolidated to a virtually pore-free condition by hot pressing at 900°C. The as-consolidated materials are characterised by a combination of high hardness, mechanical strength and resistance to abrasion. Their properties can be widely modified by changing the milling time.

Preferential Orientation Dependent Mechanical and Electrical Properties in Naβ-Alumina Ceramics

2006 ◽  
Vol 301 ◽  
pp. 147-150 ◽  
Author(s):  
Akira Kishimoto ◽  
Kousei Shimokawa
Keyword(s):  
Ionic Conductivity ◽  
Mechanical Strength ◽  
Hot Pressing ◽  
Bending Test ◽  
Two Dimensional ◽  
Mechanical Reliability ◽  
Alumina Ceramics ◽  
Three Point Bending ◽  
Mechanical And Electrical Properties ◽  
Test Pieces

Nab-alumina is a two- dimensional ionic conductor in which conducting planes of Na+ ion are separated by insulating spinel block layers. For practical use, Nab- alumina needs not only high ionic conductivity but also mechanical reliability. Therefore, we prepared preferentially oriented Nab-alumina ceramics by hot pressing and evaluated the ionic conductivity and mechanical strength. The ionic conductivity perpendicular to the c-axis-oriented plane was five times higher than that parallel to c-axis. From the preferentially oriented Nab-alumina ceramics three types of test pieces were cut for a three-point bending test. In one type of test piece, the longest side was parallel to the hot-pressing direction, while the longest sides were perpendicular to that direction in the other types of test pieces. The latter test pieces showed mechanical strength 1.5 times that of the former.

Preparation of Porous Hydroxyapatite / Tricalcium Phosphate Composite Block Using a HHP Method

2006 ◽  
Vol 309-311 ◽  
pp. 1071-1074
Author(s):  
Hee Song ◽  
Soo Ryong Kim ◽  
Jong Hee Hwang ◽  
Y. Kim
Keyword(s):  
Mechanical Strength ◽  
Diffraction Pattern ◽  
Powder Diffraction ◽  
Tricalcium Phosphate ◽  
Hot Pressing ◽  
High Mechanical Strength ◽  
Porous Hydroxyapatite ◽  
X Ray ◽  
Pore Sizes

Porous hydroxyapatite/tricalcium phosphate composite block has been prepared using a hydrothermal hot pressing (HHP) technique to achieve having a high mechanical strength and controlled biodegradability. The SEM result of the sample shows that the pore sizes are ranged from 100µm to 300µm. The observed X-ray powder diffraction pattern of the sample after sintered 1200oC is composed of hydroxyapatite and tricalciumphosphste.

Production of hydroxyapatite-glass compacts by hydrothermal hot-pressing technique

1990 ◽  
Vol 5 (3) ◽  
pp. 647-653 ◽  
Author(s):  
N. Yamasaki ◽  
K. Yanagisawa ◽  
N. Kakiuchi
Keyword(s):  
Mechanical Strength ◽  
Borosilicate Glass ◽  
Hot Pressing ◽  
Hydrothermal Reaction ◽  
Heterogeneous Reaction ◽  
Solidification Process ◽  
Point Of View ◽  
Hydrothermal Conditions ◽  
Rate Determining Step ◽  
Solidified Body

Low-temperature sintering (under 350°C) of hydroxyapatite was attempted by a hydrothermal hot-pressing technique. The effects of borosilicate glass addition on the characteristics of the solidified body (mechanical strength, microstructure, crystal structure, pore distribution, etc.) and on the densification process during hydrothermal reaction were investigated. The borosilicate glass increased the mechanical strength of the solidified body; compression of 50% content of apatite was 2100 kg/cm2. It is also shown that water acts as a good catalyzer during solidification under hydrothermal conditions, and micropores can increase toughness of the solidified body due to the adsorption of stress. These hydrothermal hot-pressing solidification processes are so similar to sintering with liquid phase under pressure that the initial kinetics was discussed by means of the velocity measurement of shrinkage rate. In addition, these reactions may proceed in water, and are then discussed from the point of view of a heterogeneous reaction between powder and aqueous solution. It was proposed that the solidification process was due to viscous flow with rearrangement of grains in the solidified body, and the rate-determining step followed a core model of extraction from solid to solution.

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