scholarly journals Powder Metallurgy: A New Open Section in Metals

Metals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1519
Author(s):  
Jose Manuel Torralba
Keyword(s):  
Powder Metallurgy ◽  
Melting Point ◽  
Thermal Process ◽  
Principal Component ◽  
Ceramic Powders ◽  
Forming Technology ◽  
Open Section

Powder Metallurgy (PM) is a forming technology that uses metallic (sometimes also in conjunction with ceramic) powders to develop parts, most of the time through a thermal process called sintering, which never reaches the melting point of the principal component of the alloy [...]

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..

Study the Re-Sticky Phenomenon of Powder Metallurgy Debris in the Electrical Discharge Machining

2009 ◽  
Vol 83-86 ◽  
pp. 968-976
Author(s):  
A Cheng Wang ◽  
Ken Chuan Cheng ◽  
Yan Cherng Lin ◽  
Jeng Shen Huang
Keyword(s):  
Powder Metallurgy ◽  
Melting Point ◽  
Rotational Speed ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Negative Polarity ◽  
Melting Points ◽  
Working Surface ◽  
Adhesive Effect

The debris re-adhering on the machining surface will affect the workpiece precision in EDM; therefore, the main purpose of this research is to study the re-sticky phenomenon of the powder metallurgy (PMM) in EDM. PMM with different melting points from 1450oC to 3410oC were used as EDM materials, the copper and the tungsten were chosen as the electrodes. The polarity in EDM was depended on the pole of the electrode. For observing the re-sticky position of the debris, the electrode was set no rotation or with 200 rpm rotational speed in EDM. The results showed that the melting point of PMM did not exceed 3000oC (PMM did not contain tungsten); the debris of PMM would not re-stick on the working surface no matter what polarity was used in EDM. However, only negative polarity can cause the re-adhesive effect when the melting point of PMM exceeded 3000oC. The debris would re-stick on any machining position when the electrode was not rotated in EDM. However, the debris would adhere on the central of the working area with 200 rpm rotational speed of the electrode.

Functional dyeable polypropylene fabric development and process parameter optimization Part I: Dyeable modified polypropylene development with process parameter optimization

2021 ◽  
pp. 004051752098497
Author(s):  
Chung-Feng Jeffrey Kuo ◽  
Shih Hsiung Chen
Keyword(s):  
Melting Point ◽  
Parameter Optimization ◽  
Polymer Melt ◽  
Principal Component ◽  
Melt Flow Index ◽  
Process Parameter ◽  
Flow Index ◽  
Disperse Dye ◽  
Color Strength ◽  
Process Parameter Optimization

This study aims to develop dyeable modified polypropylene (PP) granules with disperse dye. The optimal dyeable modified PP granule process used polyester as a mixed copolymer. The purpose was to overcome the excessive difference between the polyester material melting point and PP melting point. The development of a low-melting modified co-polybutylene adipate terephthalate (Co-PBAT) was the key point. After the low-melting modified Co-PBAT was presented, PP and a PP grafting maleic anhydride compatibilizer were made into a composite by dual-screw mixing process. The disperse dye dyeability was reached by the molecular behavior of the Co-PBAT chain segment. The prepared material was applied to explore the thermal properties of modified ester pellets and the functional group was verified by Fourier infrared spectroscopy. In this study, the Taguchi method and principal component analysis were used to optimize the process parameter design of two quality characteristics; namely, the color strength and the polymer melt flow index (MFI). According to the results, the multi-quality optimization of the ester pellets consisted of a modified Co-PBAT melting point of 170°C, the modified Co-PBAT content of 9 wt%, the compatibilizer content of 3 wt%, and the mixing temperature of 205°C. The MFI of the regular PP polymer was 28.1 g/10 min, the color strength was 100 K/S. For the optimal process, the MFI of the PP/Co-PBAT dyeable granules was 37.88 g/10 min, and the color strength was 121.31 K/S. It could be observed that the developed polymer had good circulating workability and color strength.

Synthesis of high melting point TiN mesocrystal powders by a metastable state strategy

CrystEngComm ◽  
2019 ◽  
Vol 21 (14) ◽  
pp. 2257-2263 ◽  
Author(s):  
Maoqiao Xiang ◽  
Miao Song ◽  
Qingshan Zhu ◽  
Yafeng Yang ◽  
Shaofu Li ◽  
...  
Keyword(s):  
Melting Point ◽  
Metastable State ◽  
Oxide Ceramic ◽  
High Melting ◽  
Ceramic Powders ◽  
High Melting Point ◽  
State Strategy

Synthesis of high melting point non-oxide ceramic powders with mesocrystal structure is an important and challenging task.

Pulvermetallurgie und Verbundschmieden*/Powder metallurgy and compound forging - Thermal process route for evaluating the influence of alloying elements on the bonding strength of hybrid components

2018 ◽  
Vol 108 (10) ◽  
pp. 686-690
Author(s):  
B. Behrens ◽  
P. Kuwert
Keyword(s):  
Powder Metallurgy ◽  
Bonding Strength ◽  
Thermal Process ◽  
Material Composition ◽  
Alloying Elements ◽  
Process Chain ◽  
Metallurgical Production ◽  
Process Route

Während der Herstellung durch Verbundschmieden beeinflussen die in den Werkstoffen enthaltenden Legierungselemente maßgeblich die Verbundqualität und führen zu teilweise hohen Abweichungen. Dieser Umstand kann durch die pulvermetallurgische Herstellung von Halbzeugen mit definierter Werkstoffzusammensetzung vermieden werden. In diesem Fachbeitrag werden die Verfahrenskombination sowie die Herausforderungen entlang der Prozesskette und entsprechende Lösungsansätze vorgestellt.   During compound forging, the alloying elements contained in the materials significantly influence the quality of the compound and in some cases lead to high deviations. This can be remedied by the powder-metallurgical production of semi-finished products with a defined material composition. This article presents the combination of processes and the challenges along the process chain as well as corresponding approaches to solutions.

Production of Aluminum-Silicon Carbide Composites Using Powder Metallurgy at Sintering Temperatures Above the Aluminum Melting Point

2007 ◽  
Vol 35 (6) ◽  
pp. 100677 ◽  
Author(s):  
M. R. Mitchell ◽  
R. E. Link ◽  
W. M. Khairaldien ◽  
A. A. Khalil ◽  
M. R. Bayoumi
Keyword(s):  
Silicon Carbide ◽  
Powder Metallurgy ◽  
Melting Point ◽  
Aluminum Silicon Carbide ◽  
Aluminum Silicon

Compaction Experiment on the Newly Designed Warm High Velocity Compaction Equipment

2010 ◽  
Vol 139-141 ◽  
pp. 485-488 ◽  
Author(s):  
Cui Yong Tang ◽  
Zhi Yu Xiao ◽  
Jin Chen ◽  
Chao Jie Li ◽  
Tung Wai Leo Ngai
Keyword(s):  
Powder Metallurgy ◽  
High Velocity ◽  
Hydraulic Cylinder ◽  
Gravitational Potential Energy ◽  
Green Density ◽  
Densification Mechanism ◽  
Forming Technology ◽  
Preliminary Study ◽  
High Velocity Compaction ◽  
Powder Compacts

In order to develop high density powder metallurgy forming technology, a new concept combining high velocity compaction and warm compaction called warm high velocity compaction (WHVC) was presented. A new warm high velocity compaction forming equipment which adopts gravitational potential energy instead of hydraulic cylinder as hammer driver was designed. By means of the newly developed equipment, a preliminary study on warm high velocity compaction was performed. 316L stainless powder compacts with green density of 7.47 g/cm3 were obtained; the density is much higher than those prepared by conventional high velocity compaction. These results demonstrate that the newly designed equipment can basically meet the demand of warm high velocity compaction and the new forming method is superior to the conventional high velocity compaction. In addition, Densification mechanism of WHVC was also discussed.

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