Features of the failure of powder metallurgy tungsten at different temperatures in vacuum

1981 ◽  
Vol 13 (1) ◽  
pp. 86-89
Author(s):  
E. I. Uskov ◽  
A. V. Babak
Keyword(s):  
Powder Metallurgy ◽  
Different Temperatures ◽  
Powder Metallurgy Tungsten

scholarly journals Recrystallization Process of Powder Metallurgy Tungsten Wires

1989 ◽  
Vol 53 (12) ◽  
pp. 1198-1207 ◽  
Author(s):  
Shu-Fan Chen ◽  
Hiroyuki Komeda ◽  
Koji Fujii ◽  
Koji Tanoue ◽  
Hidehiko Matsuda
Keyword(s):  
Powder Metallurgy ◽  
Recrystallization Process ◽  
Powder Metallurgy Tungsten

Effects of SiO2 Particles in Mechanical Properties of Iron Composite

2013 ◽  
Vol 465-466 ◽  
pp. 886-890
Author(s):  
Adibah Amir ◽  
Othman Mamat
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Fine Particles ◽  
Sintering Temperature ◽  
Silica Particles ◽  
Milling Process ◽  
Powder Metallurgy Technique ◽  
Temperature Changes ◽  
Different Temperatures

Tronohs raw sand was converted into fine silica particles via a series of milling process. Addition of these fine particles into iron composite was found to modify its mechanical properties. The composite was prepared using powder metallurgy technique with varying percentage of silica particles; 5, 10, 15, 20 and 25wt%. The composites were sintered at three different temperatures; 1000° C, 1100° C and 1200° C to find the most suitable sintering temperature. Changes in density and hardness were observed. The results showed that composite consist of 20wt% silica particles and sintered at 1100° C exhibits best improvement.

scholarly journals Aging Behaviour Of AA6061/SiCP Composites Produced By Direct Extrusion With A Reversibly Rotating Die Method

2015 ◽  
Vol 60 (3) ◽  
pp. 1755-1762 ◽  
Author(s):  
J. Wozniak ◽  
M. Kostecki ◽  
K. Broniszewski ◽  
W. Bochniak ◽  
A. Olszyna
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Powder Metallurgy ◽  
Thermal Treatment ◽  
Solution Treatment ◽  
Complete Dissolution ◽  
Optimum Parameters ◽  
Different Temperatures ◽  
Higher Temperature ◽  
Unconventional Method

Abstract This paper discusses the influence of thermal treatment parameters on mechanical properties of AA6061+x% vol. SiCp (x = 0, 2.5, 5, 7.5, 10) composites. The composites were consolidated via powder metallurgy processing using the unconventional method of extrusion (the KoBo method). In order to establish the optimum parameters of the heat treatment two different temperatures of supersaturation (530 and 558ºC) were applied. The aging curves were determined at various aging temperatures such as 140, 160, 180 and 200ºC. The effects of applied parameters were studied using the microstructure observations and hardness measurements. Obtained results show that the solution treatment at 530ºC is sufficient to complete dissolution of the precipitates. Higher temperature of the process resulted in accelerating the aged-hardening. The suitable age treating parameters for the AA6061-5 vol. % SiCp composites were 160 - 180ºC for 12 - 16 hours.

The Effect of a Small Volume Liquid Phase on the Hot Deformation in the BaPbO3/2024Al Composite

2010 ◽  
Vol 654-656 ◽  
pp. 2684-2687
Author(s):  
Guo Hua Fan ◽  
Zhen Zhu Zheng ◽  
Jin Cheng Pang ◽  
Lin Geng
Keyword(s):  
Powder Metallurgy ◽  
Liquid Phase ◽  
Hot Deformation ◽  
Small Volume ◽  
Mechanical Analysis ◽  
Powder Metallurgy Method ◽  
Different Temperatures ◽  
Simultaneous Decrease ◽  
Dislocation Pileups

In this paper, BaPbO3(5Vol.%)/2024Al composite was fabricated by powder metallurgy method. Nanosized Pb particles were formed from the in-situ reaction between BaPbO3 and 2024Al, and mainly distributed homogeneously inside grains. The hot compression deformation of the composite at different temperatures was performed. The microstructure evolution of the 2024Al matrix and dynamic mechanical analysis (DMA) of the composite were made to investigate the effect of liquid Pb on the hot deformation. The results show that the presence of the liquid phase reduces deformation resistance by decreasing dislocation pileups, and simultaneous decrease in Young’s modulus of the composite.

Study of Calcium Phosphate Deposition on Porous Titanium Samples

2006 ◽  
Vol 530-531 ◽  
pp. 569-574 ◽  
Author(s):  
Waléria Silva de Medeiros ◽  
Marize Varella de Oliveira ◽  
Luiz Carlos Pereira ◽  
Carlos Alberto Alves Cairo ◽  
M.A. Calixto
Keyword(s):  
Powder Metallurgy ◽  
Calcium Phosphate ◽  
Porous Titanium ◽  
Tissue Replacement ◽  
Heat Treated ◽  
Phosphate Phase ◽  
Different Temperatures ◽  
Edx Analyses ◽  
Implant Coatings ◽  
Bonelike Apatite

Surgical implant coatings and grafts for tissue replacement have been made by porous surface materials to improve the implant to bone attachment. In this work, porous titanium samples were produced via powder metallurgy techniques and submitted to the biomimetic process in order to enhance its osteoconductivity. This process allows a nucleation and growth of a calcium phosphate film which makes a chemical bond with titanium. Therefore, it avoids the looseness of this film from substrate. The samples were chemically treated, heat treated at different temperatures and soaked into a modified body fluid solution (mSBF) during periods of 2 and 7 days. Samples with and without pretreatments and not soaked in mSBF were used as controls. SEM and EDX analyses detected a calcium phosphate phase on the sample surfaces treated at 400°C and 600°C and soaked in mSBF for 2 and 7 days. The results demonstrated the potential of the methodology applied for obtaining a bonelike apatite film on porous titanium samples processed by powder metallurgy.

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