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Thermal shock stress intensity factors of SiC and Si3N4
Literature Review THERMAL SHOCK STRESS INTENSITY FACTORS OF SiC AND Si3N4
by SEM and wavelength dispersive analysis. Different types of interlayer were studied.
G A Schneider, G Petzow, (Max-Planck Institute, Stuttgart, Germany). Vol 2, Paper 23, 113-117.
SIMULTANEOUS SINTERING AND DIFFUSION BONDING OF CERAMICS TO METALS USING HIP
A test for thermal shock resistance was devised and applied to SiC and Si3N4 specimens in disc form. By use of notches, critical stress intensity factors can be calculated and compared with KIc' measured in a notched bend test.
G P Yiasemides, (Fulmer Research Laboratories, Stoke Poges, UK). Vol 2, Paper 20, 100-102.
POTENTIAL OF SILICIDES AS MATRICES FOR BORIDE REINFORCED COMPOSITES K Vedula, F Lisy, (Case Western Reserve University, Cleveland, USA). Vol 1, Paper 44, 548-556.
Alumina coated steel and SiC coated A1 were produced using HIE Intermediate layers varying in composition from 10-90% metal were in turn bonded to the metal substrate to give a composition gradient between metal and ceramic with the objective of minimizing thermal expansion mismatch. Near net shapes can be fabricated using simultaneous consolidation and diffusion bonding of metal and ceramic powders using HIE
examined by SEM and diffusion couple experiments carried out. Properties of the materials produced by the two routes were comparable.
FIBRE DAMAGE DURING PROCESSING OF MMCS A Dunning, et al, (Fulmer Research Ltd, Stoke Poges, Bucks, UK). Vol 2, Paper 53,298-301. Damage to 'Saffil' fibres, occurring during processing of A1 matrix MMC, by a powder production route, has been studied. Fibre lengths were measured after each stage. Serious damage occurs particularly during cold pressing. Damage is attributed to poor flexural strength of the fibres. It is suggested that better results may be otained with a stronger fibre such as SiC.
The ability of MoSi2 to protect TiB2 against oxidation was investigated using a particulate composite containing 20wt%TiB2 in a matrix of MoSi2. A layer of protective borosilicate glass formed. USE OF PM TO PRODUCE A! ALLOY SHORT FIBRE METAL MATRIX COMPOSITES (MMC)
JOINING OF Si3N4 TO METALS BY HIGH PRESSURE CONSOLIDATION I Gotman, E Y Gutmanas, (Technion, Haifa, Israel). Vol 1, Paper 42, 526-532. The bonding of Si3N4 to 434 ferritic stainless steel, Ni-20%Cr and invar was investigated using a PM cold sintering technique. Use of intermediate layers, of variable composition, g r e a t l y i n c r e a s e d the strength of the metal/ceramic joint. Intermediate layers act by relieving the thermal and elastic mismatch at the interface.
DIFFUSION BONDING OF Si-NITRIDE TO ODS MA6000 SUPERALLOY BY HIP A Frisch, et al, (Max Planck Institute, Stuttgart, Germany). Vol 2, Paper 11, 52-60. Intermediate layers were used to minimize the thermal mismatch between the Si3N4 ceramic coating and the superalloy substrate. Joining was attained by diffusion bonding using reactive foils. The interfaces were investigated
MPR November 1990
M Maclean, R Dower, (National Engineering Laboratory, East Kilbride, UK). Vol 2, Paper 44, 251-254. Production of A1 alloy matrix MMC has been shown to be feasible. Different A1 alloys were used in the investigation with 'Saffil' fibre as the reinforcement. Kinetics of aging in the matrix are considerably altered by the presence of the fibre. Optimum properties were found at 10wt% fibre addition.
HIP AND HEAT TREATMENT OF HOT EXTRUDED AI-SiC PARTICULATE REINFORCED METAL MATRIX COMPOSITE (MMC) J Faustino, et al, (LNETI (DTM), Lisbon, Portugal). Vol 2, Paper 52, 293-297. An A1 alloy matrix MMC with SiC powder was produced by PM and compared with a billet material produced by spray co-deposition. Materials were subjected to various thermal and mechanical treatments. HIP gave a significant increase in elastic modulus of the PM material. Ceramic/metal interfaces are
ULTRAPURE REFRACTORYMETALS FOR MICROELECTRONIC APPLICATIONS H M Ortner, P Wilhartitz, (Metallwerk-Plansee GmbH, Reutte, Austria). Vol 1, Paper 22, 346-351. Uses of refractory metals and silicides in microelectronics applications are reviewed. The need for materials of extremely high purity is emphasized.
BORIDE CONTAINING HARDENABLE TOOL MATERIALS FOR Fe.BASE PM COMPOSITES WITH GRADED STRUCTURES A Fischer, C van Nguyen, (Ruhr Universitaet Bochum, Bochum, Germany). Vol 1, Paper 12, 257-265. The objective was to produce composites, with composition graded structure, by HIE Good abrasive wear at the surface was to be
789
by SEM and wavelength dispersive analysis. Different types of interlayer were studied.
G A Schneider, G Petzow, (Max-Planck Institute, Stuttgart, Germany). Vol 2, Paper 23, 113-117.
SIMULTANEOUS SINTERING AND DIFFUSION BONDING OF CERAMICS TO METALS USING HIP
A test for thermal shock resistance was devised and applied to SiC and Si3N4 specimens in disc form. By use of notches, critical stress intensity factors can be calculated and compared with KIc' measured in a notched bend test.
G P Yiasemides, (Fulmer Research Laboratories, Stoke Poges, UK). Vol 2, Paper 20, 100-102.
POTENTIAL OF SILICIDES AS MATRICES FOR BORIDE REINFORCED COMPOSITES K Vedula, F Lisy, (Case Western Reserve University, Cleveland, USA). Vol 1, Paper 44, 548-556.
Alumina coated steel and SiC coated A1 were produced using HIE Intermediate layers varying in composition from 10-90% metal were in turn bonded to the metal substrate to give a composition gradient between metal and ceramic with the objective of minimizing thermal expansion mismatch. Near net shapes can be fabricated using simultaneous consolidation and diffusion bonding of metal and ceramic powders using HIE
examined by SEM and diffusion couple experiments carried out. Properties of the materials produced by the two routes were comparable.
FIBRE DAMAGE DURING PROCESSING OF MMCS A Dunning, et al, (Fulmer Research Ltd, Stoke Poges, Bucks, UK). Vol 2, Paper 53,298-301. Damage to 'Saffil' fibres, occurring during processing of A1 matrix MMC, by a powder production route, has been studied. Fibre lengths were measured after each stage. Serious damage occurs particularly during cold pressing. Damage is attributed to poor flexural strength of the fibres. It is suggested that better results may be otained with a stronger fibre such as SiC.
The ability of MoSi2 to protect TiB2 against oxidation was investigated using a particulate composite containing 20wt%TiB2 in a matrix of MoSi2. A layer of protective borosilicate glass formed. USE OF PM TO PRODUCE A! ALLOY SHORT FIBRE METAL MATRIX COMPOSITES (MMC)
JOINING OF Si3N4 TO METALS BY HIGH PRESSURE CONSOLIDATION I Gotman, E Y Gutmanas, (Technion, Haifa, Israel). Vol 1, Paper 42, 526-532. The bonding of Si3N4 to 434 ferritic stainless steel, Ni-20%Cr and invar was investigated using a PM cold sintering technique. Use of intermediate layers, of variable composition, g r e a t l y i n c r e a s e d the strength of the metal/ceramic joint. Intermediate layers act by relieving the thermal and elastic mismatch at the interface.
DIFFUSION BONDING OF Si-NITRIDE TO ODS MA6000 SUPERALLOY BY HIP A Frisch, et al, (Max Planck Institute, Stuttgart, Germany). Vol 2, Paper 11, 52-60. Intermediate layers were used to minimize the thermal mismatch between the Si3N4 ceramic coating and the superalloy substrate. Joining was attained by diffusion bonding using reactive foils. The interfaces were investigated
MPR November 1990
M Maclean, R Dower, (National Engineering Laboratory, East Kilbride, UK). Vol 2, Paper 44, 251-254. Production of A1 alloy matrix MMC has been shown to be feasible. Different A1 alloys were used in the investigation with 'Saffil' fibre as the reinforcement. Kinetics of aging in the matrix are considerably altered by the presence of the fibre. Optimum properties were found at 10wt% fibre addition.
HIP AND HEAT TREATMENT OF HOT EXTRUDED AI-SiC PARTICULATE REINFORCED METAL MATRIX COMPOSITE (MMC) J Faustino, et al, (LNETI (DTM), Lisbon, Portugal). Vol 2, Paper 52, 293-297. An A1 alloy matrix MMC with SiC powder was produced by PM and compared with a billet material produced by spray co-deposition. Materials were subjected to various thermal and mechanical treatments. HIP gave a significant increase in elastic modulus of the PM material. Ceramic/metal interfaces are
ULTRAPURE REFRACTORYMETALS FOR MICROELECTRONIC APPLICATIONS H M Ortner, P Wilhartitz, (Metallwerk-Plansee GmbH, Reutte, Austria). Vol 1, Paper 22, 346-351. Uses of refractory metals and silicides in microelectronics applications are reviewed. The need for materials of extremely high purity is emphasized.
BORIDE CONTAINING HARDENABLE TOOL MATERIALS FOR Fe.BASE PM COMPOSITES WITH GRADED STRUCTURES A Fischer, C van Nguyen, (Ruhr Universitaet Bochum, Bochum, Germany). Vol 1, Paper 12, 257-265. The objective was to produce composites, with composition graded structure, by HIE Good abrasive wear at the surface was to be
789