Properties of Injection Moulded Fe—Cu Parts Made from Composite and Elemental Powders

Huang, Chunyan; Hwang, K. S.

doi:10.1179/pom.1996.39.2.119

Cited by 15 publications

(11 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such rapid heating will lead to liquid appearance in 0. 5 hand, the pores act as a "snare" to trap laser photons so that the compact can absorb greater amounts of laser power, minutes (in the upper layer of the specimen), thus providing insufficient time for solid particles to build bridges. Even if which results in overheating; on the other hand, porosity The curves indicate that, with the increase of laser output power, the heating rate increases and a high temperature is attained in a short time, but that too high an output power results in compact slumping (in Figure 16, when sintering at 1400 W, the curve is incomplete because the sample collapsed).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

A study on laser sintering of Fe-Cu powder compacts

Shen

Guo

et al. 1999

Metall Mater Trans A

View full text Add to dashboard Cite

The sintering of Fe-Cu powder compacts by laser beams was studied to determine densification and microstructural development. The influence of processing variables such as Cu content, laser output power, sintering time, and green density on the densification and Brinell hardness (HB) were analyzed, and several temperature curves measured during laser sintering (LS) were also discussed in this article. After LS, the samples exhibited considerable shrinkage, which was very different from the effects of conventional sintering (CS). The main reasons for shrinkage are the laser's very fast heating rates, short sintering times, and relatively high sintering temperatures. As a consequence, insufficient time is available for Fe particles to diffuse in the solid state to form a rigid skeleton. After formation, the liquid penetrates quickly along boundaries and separates the Fe particles, leading to rapid collapse and particle rearrangement, which finally results in considerable shrinkage. An increased Cu content, laser output power, and sintering time can promote shrinkage and hardness, but compact slumping occurs when the laser power is too high.

show abstract

Section: Discussionmentioning

confidence: 99%

“…In order to prevent oxidation, all the specimens were before it penetrated grain boundaries. [5] Others suggested coated with a carbon protection layer on the surface. that a carbon addition could also lessen the expansion, as A 5 kW CO 2 laser generator with an elliptic spot was carbon increased the dihedral angle.…”

Section: Introductionmentioning

confidence: 99%

A study on laser sintering of Fe-Cu powder compacts

Shen

Guo

et al. 1999

Metall Mater Trans A

View full text Add to dashboard Cite

show abstract

“…A number of important factors have been identified in the injection of pulverized coal into the blast furnace [4][5][6][7][8][9]: for example, the coal properties, the combustion efficiency and the coal/coke replacement ratio. This article concentrates on the important factors involved in the thermochemistry of coal/coke combustion.…”

Section: Introductionmentioning

confidence: 99%

The effect of pulverised coal injection in blast furnace using computer simulation technique

Wong

Kim

2000

Metals and Materials

View full text Add to dashboard Cite

A computer model simulates the effect of different types of coals on blast furnace operations. In this study, two kinds of programs, CHEMIX and ESTIMA as parts of a thermochemistry package known as THER-MOCHEMISTRY were used for checking the adiabatic flame temperature. Results showed that the adiabatic temperature decreased considerably as the pulverized coal injection (PCI) rate increased, with the rate of decrease largely dependent on the chemical properties of the coal-mainly the carbon content and calorific value. The coal with the least carbon content has the least effect on the flame temperature. However, the coal/coke replacement ratio is very low. PCI increases the rate of generation of the reducing gases, namely CO(g) and H2(g), which depend largely on the chemical properties of coal. The results suggest that a simple calculation using computing programs may be useful for determining the suitability of a coal for injection in blast furnaces.

show abstract

“…27) In particular, the uniform distribution of fine copper powders effectively enhances pore elimination by penetration of the Cu melt into the interparticle pores during sintering at 1200°C higher than the melting point. 25,28) The spatial homogeneity of the alloying elements in the sintered part is a good measure for determining the quality of the powder making process. Figure 9 compares the chemical homogeneity of (a) the commercial powder and (b) the produced powder samples after sintering at 1200°C for 2 h. It was found that the alloying elements of Cu, Ni, and Mo were segregated in the commercial powder sample.…”

Section: Microstructures and Distribution Of The Alloyingmentioning

confidence: 99%

Improvement of Powder Properties and Chemical Homogeneity of Partially Alloyed Iron Powder by a Nanopowder Process

et al. 2014

View full text Add to dashboard Cite

The present investigation focuses on the improvements in chemical homogeneity and related powder properties of partially alloyed Fe 1.50Cu1.75Ni0.50Mo powder by using a nanopowder process. The nanosized oxide powders of CuONiOMoO 3 were prepared by ballmilling for the alloying elements and blended with iron powders. The powder mixture was annealed in a reducing atmosphere, in order to reduce the oxide powders and thereafter partially alloyed with the iron powder. The produced powder was used to evaluate the microstructure, chemical composition, compressibility, and sinterability. It was found that the powder had a uniform distribution of alloying elements with high compositional homogeneity. The fine alloying elements were mostly located in the grooves of the iron powder surface, yielding morphological change, which effectively improved the flow, packing and compaction properties of the powder. The nanopowder process also promoted a diffusion reaction during sintering at 1200°C for 2 h with a homogeneous microstructure and chemical composition.

show abstract

Properties of Injection Moulded Fe—Cu Parts Made from Composite and Elemental Powders

Cited by 15 publications

References 3 publications

A study on laser sintering of Fe-Cu powder compacts

A study on laser sintering of Fe-Cu powder compacts

The effect of pulverised coal injection in blast furnace using computer simulation technique

Improvement of Powder Properties and Chemical Homogeneity of Partially Alloyed Iron Powder by a Nanopowder Process

Contact Info

Product

Resources

About