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Densification in long cylindrical compacts of iron mixed with fine iron powder
Literature Powder production
p.36
Pressing
p.36
Sintering
p.36
Fundamentals
P.37
Aluminium
P.37
Iron and steel
P.37
Coatings
P.37
Laser machining
P.37
For copies of full papers you are recommended authors,
to contact individual
use the Interlibrary
Loan
system or, for conference
papers,
to contact the conference
organizers.
Literature. review Production of ZrO, microspheres and microshells by electro-dispersion precipitation from aqueous solutions of ZrCl, is described. The process uses an organic liquid and NH, and requires control of PH. A is presented. model for the process Simulations to describe the effects of NH, concentration were carried out. Good agreement between experiment and simulation is reported.
Production and characteristics of AgO-CuOcomposite powders H.D.Giicksman
et al. (DuPont, Wilmington, USA.) Powder Technol., Vol I JO, No 1-2, 2000, 76-81.
Powder production Insights into variables in water atomization of iron B.Bergquist. (L&d University of Technology, L.&d, Sweden.) Powder Me~~l.,Vo~42, Nu4,1999,331-342.
Effects of surfactants on surface tension and viscosity of liquids are noted. A study of effects on characteristics of water atomized Fe powders, using a wide range of material and process parameters, is described. It is reported that addition of S reduces particle size due to reduction in surface tension. Increased water pressure reduced powder density, lowered flowability and reduced swelling during sintering. A model is proposed. Addition of Al reduced standard deviation in particle size distribution and increased %C.
Wet chemical synthesis of BaTiO, from titanium dioxide microspheres M.Z.C.Hu et al. (Oak RidgeNationat Lab, USA.) Powder Tech&.,
Oak Ridge,
VolJ10, No i-2, 2000,2-14.
is reported that a low-temperature hydrothermal method for preparation of pure, controlled uniformly sized, ultrafine and nanocystalline BaTiO, powder, from 30, microspheres and Ba(OH), solution, had been developed. Reactants and products were characterized. The BaTiO, had a thermally stable cubic structure. It
Synthesis and modelling of production of zirconia by electro-dispersion precipitation N.T.Hanis et al. (University of Marykmd, USA.) Powder Technot., Vol 110, No l-2, 2oo0, f5-21.
36
MPR June
2001
It is reported that spray pyrolysis of Cu-Ag nitrate solutions had been used to make AgO-CuO composite powders. Stages in the process are described: evaporation of water, melting and decomposition, first of Cu nitrate followed by Ag nitrate, to give the oxides. The powders are shown to contain well-dispersed Ag and Cu oxides. Particle morphology varied with composition in the range 60 to 95%Ag. The method may be applicable to metal and alloy powder production,
Ni powders from aqueous slurries R.Mureno et al. (CSIC. Madrid, Spain.) Advanced Mater., Vol12, No 16, 2oo0, f192-1195. It is reported that a novel method of making metal powders had arisen from a study of rheological properties of aqueous metal suspensions. Porous Ni parts had been made. The binder used, carrageen, is considered to be a suitable binder for injection and gel casting, at low cost.
Pressing Rubber isostatic pressing M.Sagarua et al. (IntennewlIics Co Ltd, Kyaw, Jopan.) Mater. Design, Vol21, 2000,243-249.
Rubber isostatic pressing of magnetic and other powders is reviewed. The process involves filling a rubber mould with the powder which is then die pressed. A new filling technique, air tapping and grid separation is reported. This is shown to allow application of
0026-0657/01/$-see
RIP to a wide range of metallic and non-metallic powder materials.
Enhanced densification of metal powders by transformation mismatch plasticity C.Sckuk et al. (Northwestern University, Evanston, USA.1 Acta Mater., Vo 48, No 8, 2000, 1639-1653. Ti powder was hot pressed, isothermally at 980 “C, in the B phase field, and with thermal cycling between 860 and 980 “C, in the I# phase field. Den&cation was enhanced by the thermal cycling. This is attributed to transformation mismatch plasticity between phases. The experimental results are shown to agree with models for powder densification. Similar conclusions were reached for Ti powder with 1, 5 or 10~01% ZrG, even though ZrG, inhibited densification.
Densification in long cylindrical compacts of iron mixed with fine iron powder T.Nakagawa,
S.Takahashi.
N~r~~~~, &an.)
(Nihon
University,
J. Jpn Sot. Powder~o~der Met&.,
Vol47, No 1, 2000, 52-57. (In 1apanese.J It is reported that long hollow cylindrical compacts, with a thin wall, had been pressed by single action tooling from Fe powders with additions of lOwt%fine Fe powder, l%Zn stearate and 1% micro-wax. Green densities up to 88% were attained in a length of 40 mm with a 3% variation in density. The sintered tube had a radial crushing strength of 400 MPa.
Sintering Electric discharge compaction of metal powders P.K.Rajagop&net al. (BhubbaAtomicResemck Cenme, Mzunbai, India.) Mater. Science/Engineering A, Vol 280, 2000, 289-293. It is noted that conventional pressing and sintering or hot pressing may cause unacceptable grain growth in metals and alloys. A study of electric discharge sintering is described. A high pulse of current is passed through powder under pressure in a die for a few milliseconds. The requirements for densification of Ti, Sn and Zn were investigated.
front matter 0 ZOOI Elsevier Science Ltd. All rights reserved.
p.36
Pressing
p.36
Sintering
p.36
Fundamentals
P.37
Aluminium
P.37
Iron and steel
P.37
Coatings
P.37
Laser machining
P.37
For copies of full papers you are recommended authors,
to contact individual
use the Interlibrary
Loan
system or, for conference
papers,
to contact the conference
organizers.
Literature. review Production of ZrO, microspheres and microshells by electro-dispersion precipitation from aqueous solutions of ZrCl, is described. The process uses an organic liquid and NH, and requires control of PH. A is presented. model for the process Simulations to describe the effects of NH, concentration were carried out. Good agreement between experiment and simulation is reported.
Production and characteristics of AgO-CuOcomposite powders H.D.Giicksman
et al. (DuPont, Wilmington, USA.) Powder Technol., Vol I JO, No 1-2, 2000, 76-81.
Powder production Insights into variables in water atomization of iron B.Bergquist. (L&d University of Technology, L.&d, Sweden.) Powder Me~~l.,Vo~42, Nu4,1999,331-342.
Effects of surfactants on surface tension and viscosity of liquids are noted. A study of effects on characteristics of water atomized Fe powders, using a wide range of material and process parameters, is described. It is reported that addition of S reduces particle size due to reduction in surface tension. Increased water pressure reduced powder density, lowered flowability and reduced swelling during sintering. A model is proposed. Addition of Al reduced standard deviation in particle size distribution and increased %C.
Wet chemical synthesis of BaTiO, from titanium dioxide microspheres M.Z.C.Hu et al. (Oak RidgeNationat Lab, USA.) Powder Tech&.,
Oak Ridge,
VolJ10, No i-2, 2000,2-14.
is reported that a low-temperature hydrothermal method for preparation of pure, controlled uniformly sized, ultrafine and nanocystalline BaTiO, powder, from 30, microspheres and Ba(OH), solution, had been developed. Reactants and products were characterized. The BaTiO, had a thermally stable cubic structure. It
Synthesis and modelling of production of zirconia by electro-dispersion precipitation N.T.Hanis et al. (University of Marykmd, USA.) Powder Technot., Vol 110, No l-2, 2oo0, f5-21.
36
MPR June
2001
It is reported that spray pyrolysis of Cu-Ag nitrate solutions had been used to make AgO-CuO composite powders. Stages in the process are described: evaporation of water, melting and decomposition, first of Cu nitrate followed by Ag nitrate, to give the oxides. The powders are shown to contain well-dispersed Ag and Cu oxides. Particle morphology varied with composition in the range 60 to 95%Ag. The method may be applicable to metal and alloy powder production,
Ni powders from aqueous slurries R.Mureno et al. (CSIC. Madrid, Spain.) Advanced Mater., Vol12, No 16, 2oo0, f192-1195. It is reported that a novel method of making metal powders had arisen from a study of rheological properties of aqueous metal suspensions. Porous Ni parts had been made. The binder used, carrageen, is considered to be a suitable binder for injection and gel casting, at low cost.
Pressing Rubber isostatic pressing M.Sagarua et al. (IntennewlIics Co Ltd, Kyaw, Jopan.) Mater. Design, Vol21, 2000,243-249.
Rubber isostatic pressing of magnetic and other powders is reviewed. The process involves filling a rubber mould with the powder which is then die pressed. A new filling technique, air tapping and grid separation is reported. This is shown to allow application of
0026-0657/01/$-see
RIP to a wide range of metallic and non-metallic powder materials.
Enhanced densification of metal powders by transformation mismatch plasticity C.Sckuk et al. (Northwestern University, Evanston, USA.1 Acta Mater., Vo 48, No 8, 2000, 1639-1653. Ti powder was hot pressed, isothermally at 980 “C, in the B phase field, and with thermal cycling between 860 and 980 “C, in the I# phase field. Den&cation was enhanced by the thermal cycling. This is attributed to transformation mismatch plasticity between phases. The experimental results are shown to agree with models for powder densification. Similar conclusions were reached for Ti powder with 1, 5 or 10~01% ZrG, even though ZrG, inhibited densification.
Densification in long cylindrical compacts of iron mixed with fine iron powder T.Nakagawa,
S.Takahashi.
N~r~~~~, &an.)
(Nihon
University,
J. Jpn Sot. Powder~o~der Met&.,
Vol47, No 1, 2000, 52-57. (In 1apanese.J It is reported that long hollow cylindrical compacts, with a thin wall, had been pressed by single action tooling from Fe powders with additions of lOwt%fine Fe powder, l%Zn stearate and 1% micro-wax. Green densities up to 88% were attained in a length of 40 mm with a 3% variation in density. The sintered tube had a radial crushing strength of 400 MPa.
Sintering Electric discharge compaction of metal powders P.K.Rajagop&net al. (BhubbaAtomicResemck Cenme, Mzunbai, India.) Mater. Science/Engineering A, Vol 280, 2000, 289-293. It is noted that conventional pressing and sintering or hot pressing may cause unacceptable grain growth in metals and alloys. A study of electric discharge sintering is described. A high pulse of current is passed through powder under pressure in a die for a few milliseconds. The requirements for densification of Ti, Sn and Zn were investigated.
front matter 0 ZOOI Elsevier Science Ltd. All rights reserved.