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Additions of scandium to superhard titanium oxy-carbonitride coatings
Iron and steel STRUCTURAL TRANSFORMATION OF IRON POWDERS MECHANICALLY PROCESSED IN NITROGEN
D.Shaham et al. (Technion, Haifa, Israel.) Muter. Lett., Vol 27, l/2, 1996, 41-45. An investigation of Fe powders mechanically processed in N is described. Phase formation was monitored and it is reported that a body-centred tetragonal phase was precipitated in the body-centred cubic Fe matrix, the amount increasing with milling time. Distribution of N in the precipitates, bee grains and grain boundaries was determined. The dynamics of N in the nanocrystalline structures was discussed. MAGNETIC PROPERTIES OF SINTRRED IRON-CBROMIUMMOLYBDENUM ALLOYS
T.Kaito et al. (Daido Inst. of Technology, Nagoya, Japan.) J. Jpn Sot. Powder Powder Metall., Vol 43, No 1, 1996, 72-77. (In Japanese.) The effects of up to 5%Si on the properties of sintered magnetic Fe-18%Cr-2%Mo were investigated. Magnetic properties were lowered with more than 3%Si. Density and DC magnetic properties were improved as sintering temperature was increased but AC properties increased and then diminished. Possible reasons were discussed. FORMATIONAND MAGNETIC PROPERTIES OF IRON-SILICON-ZIRCONIACOMPOSITE POWDERS M.Nose et al. (Takoaka National College, Takoaka, Japan.) J. Jpn Sot. Powder Powder Metall., Vol 43, No 1, 1996,84-&l& (In Japanese.) It is reported that Fe-Si-ZrOz composite powders had been prepared by mechanical alloying in Ar. Magnetic properties and thermal stability were determined. Additions of Si markedly increased coercivity, and inhibited precipitation of ZrO, from the Fe matrix and grain coarsening. The results are attributed to a lamellar structure of Si in Fe. PREPARATION OF IRON NITRIDES BY ION IMPLANTATION
SKikkawa et al. (Osaka University, Osaka, Japan.) J. Jpn Sot. Powder Powder Metall., Vol 43, No 1, 1996, 95100. (In Japanese.) Formation of Fe nitrides during implantation of N into aFe sheet was 40 MPR December
1997
investigated. Loss of N due to nitride instability was detected during high energy implantation. Under conditions of 100 keV and 5 pA Fe,,N, was formed which crystallized at 100°C in vacuum. The N ions implanted on aFe(211) planes.
Silver FORMATION REACTIONS IN SILVERPALLADIUM ALLOYS BY GRINDING AND ISOTHERMAL ANNEALING
L.Aymard et al. (University of PiccardyJules Vernes, France.) J. Alloy. Compd, Vol238, No l/2, 1996, 116-127. An investigation of MA of Ag-Pd alloy powders is described. Effects of milling conditions and isothermal heat treatment on the powders were studied. It is shown that the characteristics of the powders depend on the type of interparticle interaction, impact or friction and the mechanical strain energy. Amorphization occurred with high energy impact interactions. The results are discussed in terms of an equilibrium between defect density and heat recovery in the grinding process.
Ceramic materials DEVELOPMENT AND APPLICATION OF SELF PROPAGATING I-IIGH TEMPERATURE SYNTHESIS
X.Yan et al. (South Eastern University, China.) Mater. Mechanical Eng., Vol 19, No 5, 1995, l-5. (In Chinese.) The use of SHS for production of ceramic and other high temperature materials is discussed. Developments in the process are outlined. Each process is analysed with regard to characteristics and fundamentals. Examples of applications are given.
V.Brozek Chemie, Pokroky
Wstav Anorganicke Prague, Czechoslovakia.)
et al.
Psaskove
Metal.,Vol
34, No 3,
1996, 26-31. (In Czech.) It is reported that the addition of SC to Ti-O-C-N sputtered coatings increased the hardness from 22 to 32 GPa up to 45 GPa. The structural features of (Sc,Ti)(O,C,N,) are discussed with reference to wear and oxidation properties. The use of SC has hitherto been limited by high cost which has recently declined.
Composite
materials
ASSESSMENT OF DISTRIBUTION OF SILICON CARBIDE IN ALUMINIUM MATRIX coMPOsITEs
L.Shi et al. (General Research Inst. of Non-Ferrous Metals, China.) Rare Metals, Vol 15, No 3, 1996, 208-213. Distribution of SIC in Al alloy MMCs is discussed with reference to the methods of evaluating uniformity of distribution. Investigations are described. CONTROL OF INTERFACE REACTIONS IN COPPER-SILICON CARBIDE FIBRE COMPOSITES
J.Pelleg et al. (Ben-Gurion University of the Negev, Israel.) Mater. Sci. Eng. A, Vol212, No 1, 1996, 139-148. It is reported that undesirable reactions at the matrix-reinforcement interface in Cu/SiC fibre composites, made by HIP, could be eliminated by addition of 2.5%Fe to the Cu. Optimum HIP conditions are given as 2 hours at 100 MPa and 650°C. Interface reactions in &/Fe/Sic can occur at longer times and higher temperatures.
Electrical materials
and magnetic
WRAR OF ALUMINA CERAMICS WITH ADDED OXIDES OF COPPER, NICKEL AND BORON
INFLUENCE OF MILLING REGIME ON PROPERTIES OF SAMARIUM-COBALT POWDER
V.N.Pavlikov et al. Poroshkovaya Metall., No 5/6, 1996, 118-123. (In Russian.) The effects of oxides of Cu, Ni and B on physico-mechanical and tribological properties of A&O, ceramics were investigated. The additions are reported to increase strength and abrasive wear resistance. Abrasion properties are correlated with strength.
N.M.Taliyan et al. Poroskovaya Metall., No 5/6, 1996, 100-103. (In Russian.) Milling of Sm-Co powders was investigated with regard to particle size distribution and contamination with 0. Optimum milling times were established for specified particle size and 0 content.
Coatings ADDITIONS OF SCANDIUM TO SUPERHARD TITANIUM OXY-CARBONITRIDE COATINGS
A SAMARIUM-IRON-NITROGEN PERMANENT MAGNET MATERIAL
TIriyama, N.Imaoka. (Asahi Chemical Industry Co Ltd, Samajima Fuji, Japan.) J. Jpn Sot. Powder Powder Metall., Vol 43, No 1, 1996, 59-65. (In Japanese.)
D.Shaham et al. (Technion, Haifa, Israel.) Muter. Lett., Vol 27, l/2, 1996, 41-45. An investigation of Fe powders mechanically processed in N is described. Phase formation was monitored and it is reported that a body-centred tetragonal phase was precipitated in the body-centred cubic Fe matrix, the amount increasing with milling time. Distribution of N in the precipitates, bee grains and grain boundaries was determined. The dynamics of N in the nanocrystalline structures was discussed. MAGNETIC PROPERTIES OF SINTRRED IRON-CBROMIUMMOLYBDENUM ALLOYS
T.Kaito et al. (Daido Inst. of Technology, Nagoya, Japan.) J. Jpn Sot. Powder Powder Metall., Vol 43, No 1, 1996, 72-77. (In Japanese.) The effects of up to 5%Si on the properties of sintered magnetic Fe-18%Cr-2%Mo were investigated. Magnetic properties were lowered with more than 3%Si. Density and DC magnetic properties were improved as sintering temperature was increased but AC properties increased and then diminished. Possible reasons were discussed. FORMATIONAND MAGNETIC PROPERTIES OF IRON-SILICON-ZIRCONIACOMPOSITE POWDERS M.Nose et al. (Takoaka National College, Takoaka, Japan.) J. Jpn Sot. Powder Powder Metall., Vol 43, No 1, 1996,84-&l& (In Japanese.) It is reported that Fe-Si-ZrOz composite powders had been prepared by mechanical alloying in Ar. Magnetic properties and thermal stability were determined. Additions of Si markedly increased coercivity, and inhibited precipitation of ZrO, from the Fe matrix and grain coarsening. The results are attributed to a lamellar structure of Si in Fe. PREPARATION OF IRON NITRIDES BY ION IMPLANTATION
SKikkawa et al. (Osaka University, Osaka, Japan.) J. Jpn Sot. Powder Powder Metall., Vol 43, No 1, 1996, 95100. (In Japanese.) Formation of Fe nitrides during implantation of N into aFe sheet was 40 MPR December
1997
investigated. Loss of N due to nitride instability was detected during high energy implantation. Under conditions of 100 keV and 5 pA Fe,,N, was formed which crystallized at 100°C in vacuum. The N ions implanted on aFe(211) planes.
Silver FORMATION REACTIONS IN SILVERPALLADIUM ALLOYS BY GRINDING AND ISOTHERMAL ANNEALING
L.Aymard et al. (University of PiccardyJules Vernes, France.) J. Alloy. Compd, Vol238, No l/2, 1996, 116-127. An investigation of MA of Ag-Pd alloy powders is described. Effects of milling conditions and isothermal heat treatment on the powders were studied. It is shown that the characteristics of the powders depend on the type of interparticle interaction, impact or friction and the mechanical strain energy. Amorphization occurred with high energy impact interactions. The results are discussed in terms of an equilibrium between defect density and heat recovery in the grinding process.
Ceramic materials DEVELOPMENT AND APPLICATION OF SELF PROPAGATING I-IIGH TEMPERATURE SYNTHESIS
X.Yan et al. (South Eastern University, China.) Mater. Mechanical Eng., Vol 19, No 5, 1995, l-5. (In Chinese.) The use of SHS for production of ceramic and other high temperature materials is discussed. Developments in the process are outlined. Each process is analysed with regard to characteristics and fundamentals. Examples of applications are given.
V.Brozek Chemie, Pokroky
Wstav Anorganicke Prague, Czechoslovakia.)
et al.
Psaskove
Metal.,Vol
34, No 3,
1996, 26-31. (In Czech.) It is reported that the addition of SC to Ti-O-C-N sputtered coatings increased the hardness from 22 to 32 GPa up to 45 GPa. The structural features of (Sc,Ti)(O,C,N,) are discussed with reference to wear and oxidation properties. The use of SC has hitherto been limited by high cost which has recently declined.
Composite
materials
ASSESSMENT OF DISTRIBUTION OF SILICON CARBIDE IN ALUMINIUM MATRIX coMPOsITEs
L.Shi et al. (General Research Inst. of Non-Ferrous Metals, China.) Rare Metals, Vol 15, No 3, 1996, 208-213. Distribution of SIC in Al alloy MMCs is discussed with reference to the methods of evaluating uniformity of distribution. Investigations are described. CONTROL OF INTERFACE REACTIONS IN COPPER-SILICON CARBIDE FIBRE COMPOSITES
J.Pelleg et al. (Ben-Gurion University of the Negev, Israel.) Mater. Sci. Eng. A, Vol212, No 1, 1996, 139-148. It is reported that undesirable reactions at the matrix-reinforcement interface in Cu/SiC fibre composites, made by HIP, could be eliminated by addition of 2.5%Fe to the Cu. Optimum HIP conditions are given as 2 hours at 100 MPa and 650°C. Interface reactions in &/Fe/Sic can occur at longer times and higher temperatures.
Electrical materials
and magnetic
WRAR OF ALUMINA CERAMICS WITH ADDED OXIDES OF COPPER, NICKEL AND BORON
INFLUENCE OF MILLING REGIME ON PROPERTIES OF SAMARIUM-COBALT POWDER
V.N.Pavlikov et al. Poroshkovaya Metall., No 5/6, 1996, 118-123. (In Russian.) The effects of oxides of Cu, Ni and B on physico-mechanical and tribological properties of A&O, ceramics were investigated. The additions are reported to increase strength and abrasive wear resistance. Abrasion properties are correlated with strength.
N.M.Taliyan et al. Poroskovaya Metall., No 5/6, 1996, 100-103. (In Russian.) Milling of Sm-Co powders was investigated with regard to particle size distribution and contamination with 0. Optimum milling times were established for specified particle size and 0 content.
Coatings ADDITIONS OF SCANDIUM TO SUPERHARD TITANIUM OXY-CARBONITRIDE COATINGS
A SAMARIUM-IRON-NITROGEN PERMANENT MAGNET MATERIAL
TIriyama, N.Imaoka. (Asahi Chemical Industry Co Ltd, Samajima Fuji, Japan.) J. Jpn Sot. Powder Powder Metall., Vol 43, No 1, 1996, 59-65. (In Japanese.)