In one form of powder methods, the powder is compressed in a die and subsequently sintered. The final dimensions are determined by the powder, die, compaction pressure, and sintering densification cycle. The higher the compaction pressure, the higher the final density and properties. Minimal densification occurs in sintering if the powders are large and the sintering temperature is low. This is...

the purpose of this study was to investigate the deposition of the hydroxyapatite (ha) coating via the electrophoresis procedure. the ha deposition was performed in an ethanol, methanol, acetone and isopropanol suspension. methanol was found to be the best deposition media. among the different environmental conditions, including the encapsulation of the samples under two vacuum types of pressur...

Sintering models at the atomistic, particle and component scales are briefly reviewed and problems in the current generation of sintering models are highlighted. A strategy of multi-scale modelling is proposed and our progress in the multiscale modelling is reported. Mathematical details of the models are left out and the paper is set out to demonstrate what is possible in the next generation o...

Implementation of an accurate sintering model into a finite element simulation program can significantly improve Powder Metallurgy (P/M) part properties and processing efficiency. The densification and creep behavior of stainless steel powders during free sintering has been simulated and the material model has been implemented by linking user subroutines to the ABAQUS finite element code. This ...

Spark plasma sintering (SPS) or pulsed electric current sintering (PECS) is a sintering techni‐ que utilizing uniaxial force and a pulsed (on-off) direct electrical current (DC) under low at‐ mospheric pressure to perform high speed consolidation of the powder. This direct way of heating allows the application of very high heating and cooling rates, enhancing densifica‐ tion over grain growth p...

A new sintering mechanism is revealed for copper powder being sintered under the influence from electrical field and force-field during forming of micro-components. The analysis of the microstructure and grain boundary evolution on the sintered samples showed that interface disappearance at contact areas between particles is a continuous process which involves new grain formation and grain refi...

In lead-zinc sintering process, various kinds of lead-zinc concentrates and returning powder from ineligible sintering production are blended and then sintered in updraft sintering machine to produce agglomerate for imperial smelting process. It is required to determine a proper mixture ratio for these materials blended to assure sintering production indices such as agglomerate composition and ...

spark plasma sintering (sps) method, as plasma activated sintering, is a method applicable for rapid sintering of metals and ceramics. owing to the advantage of rapid heating, the alumina ceramics obtained by sps have a grain size and density comparable to those of hot pressed ones. the increase of densification rate may be related to some difference in ion transport characteristics. this study...