Sulfide Transformation from Self-Lubricating to Free-Cutting in Powder Metallurgy Iron-Based Alloys

2020 ◽  
Vol 29 (2) ◽  
pp. 1034-1042
Author(s):  
Fang Yang ◽  
Qian Qin ◽  
Haixia Sun ◽  
Peng Liu ◽  
Zhimeng Guo
Keyword(s):  
Powder Metallurgy ◽  
Iron Based ◽  
Metallurgy Iron

STUDY ON COMPLEX SHAPE POWDER METALLURGY IRON-BASED PARTS PREPARED BY WARM FLOW COMPACTION

2008 ◽  
Vol 07 (02) ◽  
pp. 261-265
Author(s):  
ZHIYU XIAO ◽  
LIANG FANG ◽  
SHUHUA LUO ◽  
HONGYUN GAO
Keyword(s):  
Powder Metallurgy ◽  
Apparent Density ◽  
Fine Powder ◽  
Metal Injection Molding ◽  
Form Complex ◽  
Flow Capacity ◽  
Transverse Pressure ◽  
Iron Based ◽  
Metallurgy Iron ◽  
Complex Powder

Warm flow compaction based on warm compaction and metal injection molding is a new net-shape manufacturing technology which can produce complex powder metallurgy (PM) parts by conventional axial-pressing. Warm flow compaction makes use of improved flowability of powder binder mixture in an appropriate temperature to form complex PM-parts, like cross-shaped parts. The effect of the combination of coarse and fine powders on apparent density and flowability as well as the effect of different pressing speed and temperature on lateral flow capacity of iron-based powders were investigated. Results showed that apparent density increases as fine powder fractions increase, and transverse pressure becomes larger when pressing speeds are raised. The transverse pressure increases when the temperature of powder binder mixture approaches the melting point of the binder and the lubricant. The transverse pressure decreases as lateral-distance increases.

Comparison Study in Consolidation of Yttria Reinforced Iron-Chromium Composites Using Conventional and Microwave Sintering Technique

2013 ◽  
Vol 594-595 ◽  
pp. 832-836
Author(s):  
M. Marina ◽  
M.Z.M. Zamzuri ◽  
Mohd Nazree Derman ◽  
Mohd Asri Selamat ◽  
Z. Nooraizedfiza
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Microwave Sintering ◽  
Slow Heating ◽  
Comparison Study ◽  
Sintering Time ◽  
Microwave Furnace ◽  
Crucible Furnace ◽  
Iron Based ◽  
Iron Chromium

This research is focused on studying the density and mechanical properties of iron-chromium composites consolidated by innovative rapid microwave sintering technology against conventionally sintered counterparts using slow heating crucible furnace. Another aim of this study is to assess the viability of yttria (Y2O3) ceramic particulates as reinforcement to the iron-chromium composites. Fabrication of iron-chromium-yttria composites consolidated in microwave furnace and conventional crucible furnace was successfully accomplished. Improvement of density is evident in microwave sintered composites. The Y2O3 addition significantly increases the hardness of the composite (118 Hv for microwave specimens as opposed to 110Hv for conventional specimens). The study also successfully established the viability of microwave sintering technique for consolidating iron based powder metallurgy composites by up to 80% reduction of sintering time.

Tribological properties of double-glow plasma Tungsten-Molybdenum alloyed layer on iron-based powder metallurgy gear materials

2019 ◽  
Vol 6 (8) ◽  
pp. 0865a9
Author(s):  
Zili Liu ◽  
Zhendong Fang ◽  
Dongbo Wei ◽  
Xiqin Liu ◽  
Haohao Li ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Tribological Properties ◽  
Alloyed Layer ◽  
Iron Based ◽  
Glow Plasma

Characterization and Properties of Iron/Silica-Sand-Nanoparticle Composites

2011 ◽  
Vol 316-317 ◽  
pp. 97-106 ◽  
Author(s):  
Tahir Ahmad ◽  
Othman Mamat
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Powder Metallurgy ◽  
Metal Matrix ◽  
Silica Sand ◽  
Particulate Composites ◽  
Powder Metallurgy Technique ◽  
Superior Mechanical Properties ◽  
Iron Based ◽  
Nanoparticle Composites

Metal matrix-particulate composites fabricated by using powder metallurgy possess a higher dislocation density, a small sub-grain size and limited segregation of particles, which, when combined, result in superior mechanical properties. The present study aims to develop iron based silica sand nanoparticles composites with improved mechanical properties. An iron based silica sand nanoparticles composite with 5, 10, 15 and 20 wt.% of nanoparticles silica sand were developed through powder metallurgy technique. It was observed that by addition of silica sand nanoparticles with 20 wt.% increased the hardness up to 95HRB and tensile strength up to 690MPa. Sintered densities and electrical conductivity of the composites were improved with an optimum value of 15 wt.% silica sand nanoparticles. Proposed mechanism is due to diffusion of silica sand nanoparticles into porous sites of the composites.

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