The Influence of Cu on the Electrical Properties of Ti(C, N)-Based Cermets

2011 ◽  
Vol 399-401 ◽  
pp. 792-795
Author(s):  
Li Juan Pang ◽  
Gang Deng ◽  
Xue Feng Zhang ◽  
Hui Rong Li ◽  
Min Xian Fang ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Powder Metallurgy ◽  
Electrical Properties ◽  
Flexural Strength ◽  
Wetting Angle ◽  
Vacuum Condition ◽  
Powder Metallurgy Method

Cermets Ti(C，N)80%Co(10-x)% TiC10% Cux%(wt%，x=0，1，2，3， 4， 5) were prepared by powder metallurgy method under vacuum condition at 1500°C and the effects of Cu element to the electrical resistivity and flexural strength were studied in this paper. It turns out the electrical resistivity of the samples obviously decreases with the introduction of Cu element, but the electrical resistivity of the samples increases when the amount of Cu element in the samples becomes more. The flexural strengths of the samples decrease with the amount of Cu element increasing. Ti（C，N）80% Co9%TiC10% Cu1% shows the lowest electrical resistivity and the biggest flexural strength, 7.35*10-7Ω•m and 50.6Mpa. This may be due to the big wetting angle between Cu and the powders of the based body. With the amount of Cu element increasing, the obvious interfaces are made thus the electrical resistivity becomes bigger.

Synergetic effect of NbSe2 and Cr2Nb on the tribological and electrical behavior of Cu-based electrical contact composites

RSC Advances ◽  
2015 ◽  
Vol 5 (122) ◽  
pp. 100472-100481 ◽  
Author(s):  
Qin Shi ◽  
Jin Yang ◽  
Wei Xiang Peng ◽  
Jin Ze Dong ◽  
Yan Qiu Chu ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Electrical Properties ◽  
Electrical Contact ◽  
Synergetic Effect ◽  
Solid Lubricants ◽  
Powder Metallurgy Method ◽  
Electrical Behavior ◽  
Mechanical And Electrical Properties

The Cu-based electrical contact composites containing reinforcement (Cr2Nb particles) and solid lubricants (NbSe2 particles) were fabricated by a powder metallurgy method, and their mechanical and electrical properties were investigated.

Effect of Ultra High Molecular Weight Polyethylene (UHMWPE) as Binder and Sintering Temperature in Kaolin Geopolymer Ceramics on Flexural Strength

2016 ◽  
Vol 857 ◽  
pp. 412-415
Author(s):  
Romisuhani Ahmad ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Kamarudin Hussin ◽  
Andrei Victor Sandu ◽  
Mohammed Binhussain ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Powder Metallurgy ◽  
Flexural Strength ◽  
High Molecular Weight ◽  
Sintering Temperature ◽  
Powder Metallurgy Method ◽  
Liquid Ratio ◽  
Naoh Solution ◽  
Alkaline Activator ◽  
Ultra High Molecular Weight

This paper present the flexural strength of kaolin geopolymer ceramics with addition of ultra-high molecular weight polyethylene (UHMWPE) as a binder. The effect of varying UHMWPE loading and different sintering temperature on kaolin geopolymer ceramics were evaluated. Kaolin and alkaline activator were mixed with the solid-to-liquid ratio of 1.0. Alkaline activator was formed by mixing the 8 M NaOH solution with sodium silicate at a ratio of 0.24. Addition of UHMWPE to the kaolin geopolymer ceramics are fabricated with UHMWPE loadings of 2, 4, 6 and 8 (wt. %) by using powder metallurgy method. The samples were heated at different temperature started from 900 °C until 1200 °C and the strength were tested. It was found that the flexural strength for the kaolin geopolymer ceramics with addition of UHMWPE were higher and generally increased with the increasing of UHMWPE loading. Similar trend was observed for the effect of sintering temperature. The result revealed that the optimum flexural strength was obtained at UHMWPE loading of 8 wt. % and the samples heated at 1200 °C achieved the highest flexural strength (49.15 MPa).

Influence of Mo Content on the Properties of TiC-Based Cermets

2012 ◽  
Vol 602-604 ◽  
pp. 530-535 ◽  
Author(s):  
Neng Wei Wang ◽  
Yan Wei Tong ◽  
Min Xian Fang
Keyword(s):  
Powder Metallurgy ◽  
Structural Material ◽  
Flexural Strength ◽  
Powder Metallurgy Method ◽  
Mo Content

The cermet prepared by powder metallurgy method is a new structural material. In this article TiC-based cermets prepared by using the vacuum sintered was described, the influence of the different Mo content of TiC-based cermets on the flexural strength and resistivity was discussed and analyzed from its structure and wettability of the Ni. The results showed that the Mo content was 10% in TiC-Ni-Mo cermet, that is, the ratio of Ni and Mo was 1:1, TiC-based cermet had smallest resistivity and higher flexural strength.

Fabrication and Microstructure of Clay-Based Geopolymer Ceramic Using Powder Metallurgy Method

2015 ◽  
Vol 754-755 ◽  
pp. 145-151 ◽  
Author(s):  
Nur Ain Jaya ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Che Mohd Ruzaidi Ghazali ◽  
Mohammed Binhussain ◽  
Kamarudin Hussin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Flexural Strength ◽  
Pore Structure ◽  
Glassy Phase ◽  
Total Porosity ◽  
Sintered Sample ◽  
Sem Analysis ◽  
Effect Of Temperature ◽  
Powder Metallurgy Method

Geopolymers can be transforms into ceramics upon sintering. This paper reports the effect of temperature on the mechanical properties and microstructure of Na based kaolin geopolymer ceramic. The Na2O.Al2O3.4SiO2was fabricated through powder metallurgy method. The geopolymers samples were exposed to temperature from 900 °C up to 1200 °C. The relative density, total porosity and flexural strength of sintered sample ranged approximately 84%-95%, 5.04%-15.73% and 20-70 MPa respectively. SEM analysis on as-sintered sample showed glassy phase while polished sample showed the pore structure and distribution. XRD results showed that nepheline appeared in all heated samples. Samples heated to 1200 °C achieved highest flexural strength and toughness of 70MPa due to the optimum density.

Study on Preparation of Gradient Porous Ti by Powder Metallurgy Method

2012 ◽  
Vol 490-495 ◽  
pp. 3589-3593 ◽  
Author(s):  
Qiang Li ◽  
Jing Yuan Yu ◽  
Er Yong Zheng ◽  
Ze Sun ◽  
Yu Shan Zeng
Keyword(s):  
Powder Metallurgy ◽  
Flexural Strength ◽  
Sintering Temperature ◽  
Flexural Property ◽  
Powder Metallurgy Method ◽  
Stress Strain ◽  
Pore Former ◽  
Pore Characteristic ◽  
Porous Ti ◽  
Sintering Shrinkage

Gradient porous Ti was prepared by powder metallurgy method using NH4HCO3 as pore former. The effect of content and distribution of NH4HCO3 and sintering temperature on pore characteristic, sintering shrinkage, flexural property was studied. Stress-strain curves of gradient and uniform porous Ti material were compared. The results show the porosity, sintering shrinkage rate and flexural strength vary from 51.8% to 41.3%, from 23.5% to 28.7%, and from 145.7 MPa to 221.6 MPa when the distribution of NH4HCO3 varying form uniformity to gradient. Additionally, with the increase of sintering temperature, the porosity of gradient samples first increases and then decreases. When sintered at 1573K for 2h, the porosity of gradient porous Ti has the maximum of 45.6%. Moreover, there is pseudo yield phenomenon according to the test curve of three points bending of the gradient porous Ti with three layers structure.

Role of Aluminium on the Microstructure and Corrosion Behaviour of Magnesium Prepared by Powder Metallurgy Method

2020 ◽  
Vol 17 (3) ◽  
pp. 8206-8213
Author(s):  
J. Alias
Keyword(s):  
Corrosion Resistance ◽  
Powder Metallurgy ◽  
Corrosion Behaviour ◽  
Corrosion Current ◽  
Optical Microscope ◽  
High Reactivity ◽  
Aluminium Content ◽  
Powder Metallurgy Method ◽  
X Ray Diffraction ◽  
Promising Development

Much research on magnesium (Mg) emphasises creating good corrosion resistance of magnesium, due to its high reactivity in most environments. In this study, powder metallurgy (PM) technique is used to produce Mg samples with a variation of aluminium (Al) composition. The effect of aluminium composition on the microstructure development, including the phase analysis was characterised by optical microscope (OM), scanning electron microscopy (SEM) and x-ray diffraction (XRD). The mechanical property of Mg sample was performed through Vickers microhardness. The results showed that the addition of aluminium in the synthesised Mg sample formed distribution of Al-rich phases of Mg17Al12, with 50 wt.% of aluminium content in the Mg sample exhibited larger fraction and distribution of Al-rich phases as compared to the 20 wt.% and 10 wt.% of aluminium content. The microhardness values were also increased at 20 wt.% and 50 wt.% of aluminium content, comparable to the standard microhardness value of the annealed Mg. A similar trend in corrosion resistance of the Mg immersed in 3.5 wt.% NaCl solution was observed. The corrosion behaviour was evaluated based on potentiodynamic polarisation behaviour. The corrosion current density, icorr, is observed to decrease with the increase of Al composition in the Mg sample, corresponding to the increase in corrosion resistance due to the formation of aluminium oxide layer on the Al-rich surface that acted as the corrosion barrier. Overall, the inclusion of aluminium in this study demonstrates the promising development of high corrosion resistant Mg alloys.

Synthesis and Characterisation of Anodized Powder Metallurgy Mg-Ca Alloy

2018 ◽  
Vol 280 ◽  
pp. 221-225
Author(s):  
C.D. Zuraidawani ◽  
F.W. Norhadira ◽  
Mochd Nazree B. Derman
Keyword(s):  
Powder Metallurgy ◽  
Oxide Film ◽  
Vickers Hardness ◽  
Film Formation ◽  
Surface Hardness ◽  
Powder Metallurgy Method ◽  
Xrd Pattern ◽  
Surface Changes

The Mg-1wt.%Ca alloy was fabricated using powder metallurgy method. The anodizing process were done by using different voltage (5V, 15V, 25V) and concentration of KOH (0.1M, 0.5M, 1.0M). The surface changes on PM Mg/1wt.%Ca resulted by anodizing was analyzed using SEM-EDX and XRD pattern. Meanwhile, surface hardness was measured by micro-Vickers hardness machine. The experiment found different XRD pattern between all non-anodized and anodized samples. The study found that increasing the voltage will increase the hardness while increasing KOH concentration reduced the hardness. The relation of the hardness and oxide film formation can be analyzed using SEM-EDX and XRD pattern. The optimum value for voltage, KOH concentration and hardness are 25V, 0.1M and 27.2 HV. The XRD detect the changes in PM Mg/1wt.% Ca indicates the oxide film formation.

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