Fabrication of CuSiC Composite by Powder Metallurgy Route

2011 ◽  
Vol 264-265 ◽  
pp. 748-753 ◽  
Author(s):  
A.R. Fatimah Azreen ◽  
Agus Geter E. Sutjipto ◽  
Erry Yulian Triblas Adesta
Keyword(s):  
High Temperature ◽  
Powder Metallurgy ◽  
Vickers Hardness ◽  
Processing Technique ◽  
Vacuum Furnace ◽  
Milling Machine ◽  
Sic Fibers ◽  
High Temperature Processing ◽  
Shape Component ◽  
Powder Metallurgy Route

Copper-based composite now is a potential material for various applications, while powder metallurgy processing technique is an alternative for high temperature processing materials and net shape component. In this research, Cu-based composite containing 10-50 vol% SiC fibers was fabricated by employing the powder metallurgy route. The mixtures of SiC fibers and Cu particles were blended in a ball milling machine with the addition of ethanol at 150rpm. Then, the mixtures were uniaxially compacted into a ɸ13.5mm cylindrical pallet and followed by sintering in vacuum furnace from 800-950°C for 4 hours. The density of the composite decrease with increasing SiCf and density as high as 87% for 10vol% SiCf/Cu matrix sintered at 800°C had been achieved. The Vickers hardness of 774MPa also had been achieved for 10vol% SiCf/Cu matrix but sintered at 900°C.

Characterization of Ti-27Nb-13Zr Alloy Produced by Powder Metallurgy

2012 ◽  
Vol 77 ◽  
pp. 178-183
Author(s):  
Marcio W.D. Mendes ◽  
Ana Helena Almeida Bressiani ◽  
José Carlos Bressiani
Keyword(s):  
Elastic Modulus ◽  
Powder Metallurgy ◽  
Vickers Hardness ◽  
High Vacuum ◽  
High Strength ◽  
Hardness Test ◽  
High Energy ◽  
Vacuum Furnace ◽  
Mean Values ◽  
13Zr Alloy

Titanium alloy are widely used in biomedical applications due to their excellent properties such as high strength, good corrosion resistance and excellent biocompatibility. Researches are being developed with elements such as Nb and Zr that reach all criterions for excellent biocompatibility and provide titanium alloys with Young’s modulus close to human bone. The aim of this work was to produce Ti-27Nb-13Zr alloy with different milling times by powder metallurgy process. The mixtures were performed by high energy milling and sintering in high vacuum furnace with temperature of 1300 °C / 3 h. The microstructures of samples were analyzed by SEM and XRD, while the mechanical behavior was evaluated by elastic modulus and Vickers hardness test. The diffraction results of sintering treatment indicate that the alloys are composed of α and β phases. Images obtained by SEM indicate the formation of equiaxial structures. Vickers hardness measurements from sintered samples with 1300 °C / 3 h indicate mean values around 413, 473 and 609 HV for 2, 6 and 10 hours of milling, respectively. The values of elastic modulus enable use the alloy as biomaterial.

Development of Cu-SiC Composite for Electrical Discharge Machining Electrode Using Powder Metallurgy Technique

2012 ◽  
Vol 576 ◽  
pp. 203-207 ◽  
Author(s):  
A.R. Fatimah Azreen ◽  
A.G.E. Sutjipto ◽  
A.M. Al-Bat’hi Souad
Keyword(s):  
Thermal Conductivity ◽  
Powder Metallurgy ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Compaction Pressure ◽  
Vacuum Furnace ◽  
Milling Machine ◽  
Powder Metallurgy Technique ◽  
Sic Whiskers ◽  
Microscopy Analysis

In this research, composites containing 10-50 vol% SiC whiskers reinforced Cu matrix were fabricated using powder metallurgy technique. The mixtures were blended in a ball milling machine with the addition of ethanol for 2 hours at 150 rpm. The mixtures were allowed to dry in an oven at temperature of 40 °C. Then, the mixtures were uniaxially compacted into a cylindrical pallet of Φ 13.5 x 2 mm under compaction pressure of 472 MPa. It was followed by sintering in vacuum furnace at temperatures of 800-950 °C for 4 hours. The density, microhardness, electrical resistivity, thermal conductivity and microscopy analysis of the sintered composites were studied and reported in this paper.

Sample Preparation of TiO2 Added ZnO Using Powder Metallurgy Route and its Characteristics

2020 ◽  
Vol 981 ◽  
pp. 78-83
Author(s):  
Agus Geter Edy Sutjipto ◽  
Low Kai Ti ◽  
Yuli Panca Asmara ◽  
Ari Legowo
Keyword(s):  
Grain Size ◽  
Powder Metallurgy ◽  
Electrical Properties ◽  
Metal Oxide ◽  
Gas Sensor ◽  
Vickers Hardness ◽  
High Purity ◽  
Density Measurement ◽  
Doped Zno ◽  
Powder Metallurgy Route

Metal oxide semiconductor gas sensors have been widely utilized in a variety of different roles and industries. They are relatively inexpensive, robust, lightweight, long lasting and benefit from high material and quick response time compared to other sensing technologies. However, there are major challenges need to overcame by developers in order to construct a semiconductor metal oxide gas sensor that is efficient, and durable and most importantly can work at lower temperature. Therefore, in this research, TiO2 dopants was introduced into conventional high purity ZnO gas sensor whereby the samples were prepared in pellet form using powder metallurgy route. The improvement in the mechanical properties as well as the electrical properties of the samples was wished to be observed through this research. The density measurement showed that the adding of TiO2 was efficient to promote the densification of ZnO sample in which 9 wt% TiO2 doped ZnO sample showed the highest density. The XRD results showed that the diffraction pattern was basically attributed to the wurtzite structure of ZnO. This was proven by the plane (1 0 1) had the highest intensity in all the samples except 6 wt% TiO2 and 9 wt% TiO2 doped ZnO sample. SEM showed that the grain size of ZnO decreased with the addition of TiO2. This was caused by the formation of the new phase which was Zn2TiO4. The smaller the grain size, the higher the specific surface area and oxygen adsorption quantity, and therefore the higher the gas sensitivity is. UV-Vis showed that the wavelength of all samples was located around 380 nm. Therefore, the calculated exitonic energy was around 3.20 eV which was nearly matched with the theoretical band gap of ZnO (3.37 eV). The measurement of the resistivity using four point probe showed that the electrical resistivity of the samples decrease up to addition of 9 wt% TiO2. This was attributed to increased carrier concentration. Vickers hardness test showed that the doping of TiO2 had increased the hardness of the sample whereby the 9 wt% TiO2 doped ZnO sample showed the highest value of hardness. The addition of TiO2 into high purity ZnO has influenced the mechanical and electrical properties of ZnO. From observing the microstructural and density measurement to the measurement of the surface resistivity as well as the determination of the Vickers hardness value, it was found that 9 wt% TiO2 doped ZnO was predicted as a candidate for substituting a conventional high purity ZnO as the gas sensor.

AFM study of the dynamics of α-alumina surface faceting during high-temperature processing

1995 ◽  
Vol 53 ◽  
pp. 334-335 ◽  
Author(s):  
Michael W. Bench ◽  
Jason R. Heffelfinger ◽  
C. Barry Carter
Keyword(s):  
High Temperature ◽  
Thin Foil ◽  
Sem Analysis ◽  
Conductive Coatings ◽  
Force Microscopy ◽  
Minimal Sample ◽  
Atomic Force ◽  
Formation And Evolution ◽  
High Temperature Processing ◽  
Nominal Surface

To gain a better understanding of the surface faceting that occurs in α-alumina during high temperature processing, atomic force microscopy (AFM) studies have been performed to follow the formation and evolution of the facets. AFM was chosen because it allows for analysis of topographical details down to the atomic level with minimal sample preparation. This is in contrast to SEM analysis, which typically requires the application of conductive coatings that can alter the surface between subsequent heat treatments. Similar experiments have been performed in the TEM; however, due to thin foil and hole edge effects the results may not be representative of the behavior of bulk surfaces.The AFM studies were performed on a Digital Instruments Nanoscope III using microfabricated Si3N4 cantilevers. All images were recorded in air with a nominal applied force of 10-15 nN. The alumina samples were prepared from pre-polished single crystals with (0001), , and nominal surface orientations.

CRM MOLYBDENUM-50 RHENIUM

Alloy Digest ◽  
1970 ◽  
Vol 19 (12) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Powder Metallurgy ◽  
Melting Point ◽  
Physical Properties ◽  
Heat Treating ◽  
Electrical Contacts ◽  
High Melting ◽  
High Melting Point ◽  
Temperature Performance

Abstract CRM MOLYBDENUM-50 RHENIUM is a high-melting-point alloy for applications such as electronics tube components, electrical contacts, thermionic converters, thermocouples, heating elements and rocket thrusters. All products are produced by powder metallurgy. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as creep. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Mo-11. Producer or source: Chase Brass & Copper Company Inc..

CRM RHENIUM

Alloy Digest ◽  
1970 ◽  
Vol 19 (8) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Powder Metallurgy ◽  
Melting Point ◽  
Heat Treating ◽  
Electrical Contacts ◽  
High Melting ◽  
High Melting Point ◽  
Temperature Performance ◽  
Commercially Pure

Abstract CRM RHENIUM is a commercially pure, high-melting-point metal for applications such as electronics tube components, electrical contacts, thermionic converters, thermocouples, heating elements and rocket thrusters. All products are produced by powder metallurgy. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as creep. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Re-1. Producer or source: Chase Brass & Copper Company Inc..

WIELAND DURO TANTALUM

Alloy Digest ◽  
2020 ◽  
Vol 69 (11) ◽  
Keyword(s):  
High Temperature ◽  
Powder Metallurgy ◽  
Physical Properties ◽  
Tensile Properties ◽  
Refractory Metal ◽  
Temperature Performance

Abstract Wieland Duro Tantalum is unalloyed tantalum that is produced from powder metallurgy consolidated ingots. It is a versatile refractory metal that is used in demanding applications requiring resistance to high temperature and corrosion. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on low and high temperature performance as well as machining and joining. Filing Code: Ta-14. Producer or source: Wieland Duro GmbH.

YSS HAP72

Alloy Digest ◽  
2019 ◽  
Vol 68 (10) ◽  
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Powder Metallurgy ◽  
Tool Steel ◽  
High Speed ◽  
High Wear Resistance ◽  
Bend Strength ◽  
Temperature Performance ◽  
Very High

Abstract YSS HAP72 is a powder metallurgy high-speed tool steel with a very high wear resistance. This datasheet provides information on composition, hardness, and bend strength. It also includes information on high temperature performance. Filing Code: TS-779. Producer or source: Hitachi Metals America Ltd.

Sign in / Sign up

Export Citation Format

Share Document