scholarly journals The effect of porosity and cu rate on microstructure and mechanical properties of co alternative powder metallurgy compound

2017 ◽  
Vol 49 (3) ◽  
pp. 225-234
Author(s):  
Ertuğrul Çelık ◽  
Alı Aslan
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Hot Pressing ◽  
Theoretical Density ◽  
Microstructure And Mechanical Properties ◽  
Vacuum Atmosphere ◽  
Porosity Ratio ◽  
Cold Pressed ◽  
Measured Density

Cu-Ni-MX1480 powder compound were prepared at six different alloy ratios and cold pressed with a pressure of 300 MPa. Then 12 samples were obtained by hot pressing at 700 ?C with 20 MPa pressure and at 800?C with 30 MPa pressure for 4 minutes in a vacuum atmosphere hot pressing machine. Porosity ratios of samples were calculated by the different between theoretical density and measured density of samples. Effect of porosity on microstructure and mechanical properties were investigated by performing SEM, XRD, hardness measurements and TRS tests. It was observed that as a result of increased hot pressing parameters and increased Cu ratio, porosity ratio was decreased and better mechanical properties achieved.

scholarly journals Investigation of the effect of addition of boron nitride on microstructure and mechanical properties of cast iron brake materials used in railway vehicles

2021 ◽  
pp. 64-69
Author(s):  
Harun Cug ◽  
Khangardash Asgarov ◽  
Gülcan Tigci ◽  
Mustafa Dursunlar
Keyword(s):  
Mechanical Properties ◽  
Cast Iron ◽  
Powder Metallurgy ◽  
Hot Pressing ◽  
Density Measurement ◽  
Argon Atmosphere ◽  
Brake Shoe ◽  
Steel Mold ◽  
Cold Pressing ◽  
Microstructure And Mechanical Properties

In this study, characterization of cast iron break shoes used in locomotives and the effect of BN addition and BN addition on microstructure and mechanical properties by using powder metallurgy (PM) method by adhering to the chemical composition of cast iron break shoes were investigated. In this context, cast iron sabers were chemically analyzed and all elements were supplied in powder form, and then BN added powder compositions were produced by cold and hot pressing technique. A total of 4 different compositions were created without BN, with 0.25, 0.5 and 1 % BN addition. Cold pressing was made in a steel mold with a diameter of 10 mm under 700 MPa pressure under room conditions. Hot pressing was carried out in a graphite mold with a diameter of 15 mm in an argon atmosphere under a pressure of 45 MPa at a temperature of 900 °C. Then the cold and hot pressed samples were sintered at 1 200 °C for 2 hours in argon atmosphere. Density measurement of the produced compositions, microstructure examination, micro hardness measurement were made. Generally, in density measurements, the densities of the samples subjected to hot pressing were higher than the cold pressing process. The hardness value decreased in parallel with the addition of BN. Keywords: Brake shoe; powder metallurgy; microstructure; mechanical properties

scholarly journals Microstructure and mechanical properties of solid state recycled 4Cr5MoSiV (H11) steel prepared by powder metallurgy

2021 ◽  
pp. 100184
Author(s):  
Gyanendra Bhatta ◽  
Luis De Los Santos Valladares ◽  
Xinggang Liu ◽  
Zhaojun Ma ◽  
A. Bustamante Domínguez ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Solid State ◽  
Microstructure And Mechanical Properties

Microstructure and mechanical properties of TiB2-B4C ceramics fabricated by hot-pressing

2021 ◽  
Author(s):  
Daimeng Chen ◽  
Kuibao Zhang ◽  
Jianjun Zeng ◽  
Haiyan Guo ◽  
Bo Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hot Pressing ◽  
Microstructure And Mechanical Properties

scholarly journals Study on Microstructure and Mechanical Properties of Al7068 Reinforced with Silicon Carbide and Fly Ash by Powder Metallurgy

2021 ◽  
Vol 7 (09) ◽  
pp. 47-53
Author(s):  
Md Mehtab Alam and B.S Motgi
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
Fly Ash ◽  
Powder Metallurgy ◽  
Aluminum Matrix ◽  
Hydraulic Press ◽  
Powder Form ◽  
X Ray ◽  
Microstructure And Mechanical Properties ◽  
Scanning Electron

The paper deals with detailed study on microstructure and mechanical properties of aluminum 7068 reinforced with fly ash and silicon carbide by powder metallurgy, aluminum 7068, silicon carbide and fly ash were taken in powder form of required size and mixed together in varying proportion according to specification and compacted with pressure of 400MPa using hydraulic press to make samples and then samples were sintered at 600°c for 2 hours, the samples were tested for density, compressive strength, hardness and microstructure was analyzed using scanning electron microscope, energy dispersive x-ray study was carried out in order to confirm presence of silicon carbide and fly ash in aluminum matrix.

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