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Production of composite sandwich structures
~
UTTERWORTH EINEMANN
Abstracts of Patents
composiws 26 (1995) 605 606 © 1995 Elsevier Science Limited Printed in Great Britain. All rights reserved 0010-4361/95/$10.00
A b s t r a c t s o f U S p a t e n t s p r e p a r e d b y D r R.J. Hand, University o f Sheffield, U K
COMPONENTS Production of composite sandwich structures Cassell, G. (McDonnell Douglas Corporation, Huntingdon Beach, CA, USA) US Pat 5 344 685 (6 September 1994) A contoured shell radome structure comprises inner and outer facings of a glass fibrereinforced resin between which there is a contoured foam core. The foam core consists of straight, relatively stiff, narrow foam mandrels. Fibre-reinforced composite structures, and methods of making same Burgess, K.E. (Techniweave, Inc., Rochester, NH, USA) US Pat 5 346 774 (13 September 1994) A preform for infiltration by a matrix to form a reinforced composite structure, is described. The preform comprises at least two elements which are at an angle to each other and which are made of yarns. Composite moulding apparatus for high pressure co-cure moulding of lightweight honeycomb core composite articles having ramped surfaces utilising low density, stabilised ramped honeycomb cores Dublinski A.C., Carstensen, T.A. and Ramey, P.J. (United Technologies Corporation, Hartford, CT, USA) US Pat 5 354 195 (11 October 1994) The moulding article is composed of a rigid base member and a complementary semirigid mould member, which consists of layers of reinforced tooling material, unreinforced elastomeric material and at least one rigid reinforcement layer. The semi-rigid mould member is flexible during high pressure cocure moulding.
MATERIALS Refractory metal reinforced MoSi2/SiC composite with matched thermal coefficients of expansion Jayashankar, S. and Kaufman, M.J. (University o f Florida, Gainesville, EL, USA) US Pat 5 340 531 (23 August 1994) A silica-free MoSi2 matrix contains a dispersion of SiC and is reinforced with a particulate ductile refractory metal. The thermal expansion coefficient of the MoSi2/SiC matrix is equivalent to that of the refractory metal. Structurally reinforced thermoplastic-fabric composite construction materials that are mouldable Grimnes, M.S. (Brunswick Technologies, Inc., Brunswick, ME, USA) US Pat 4 344 687 (6 September 1994) This thermoplastic-fabric flexible web can be moulded under heat and pressure to form an internally reinforced moulded article. The web comprises at least one thermoplastic resin layer and at least one woven fabric
layer which contains reinforcing fibres. Stitching extends through all the layers so that the whole can be handled as a unit. Carbon fibre prepreg and carbon fibre reinforced resin composite Ide, S., Shimamoto, A., Yutori, T. and Uchimura, M. (Kabushiki Kaisha Kobe Seiko Sho, Kobe, Japan) US Pat 4 344 689 (6 September 1994) A prepreg is described that contains unidirectional carbon fibres, co-directional stranded steel filaments and a matrix resin. The ratio of steel to carbon fibres is 10 vol% or less. The steel filaments have a diameter of 100 ~,m or less and an area reduction at fracture of 20% or more. Fibre-reinforced rubber Nakanishi, Y. (Bando Chemical Industries, Ltd, Kobe, Japan) US Pat 5 346 731 (13 September 1994) Rubber is reinforced with a number of tubular braided cores braided by yarns at a braid angle of between 10 and 35 °. Reinforced silicon carboxide composite with boron nitride coated ceramic fibres Stranford, G.T., Leung, R.Y. and Gonczy, S.T. (Allied-Signal Inc., Morris Township, Morris County, N J, USA) US Pat 5 354 602 (11 October 1994) The composite described comprises a carbon black containing glass ceramic reinforced with refractory fibres that have a boron nitride coating of 0.01 - 5 pm thickness. The glass ceramic has the empirical formula SiCxOy where 0.9 _< x _< 1.6 and 0.7 _
forced coatings o r metal components is described. The blank consists of a number of SiC fibres knitted into a knitted Ti wire mesh with lower and upper wire meshes.
PROCESSES Combustion synthesis process utilising an ignitable primer which is ignited after the application of pressure Stangle, G.C., Niedzialek, S.E. and Williams, W.C. (Alfred University, Alfred, NY, USA) US Pat 5 340 533 (23 August 1994) A combustion synthesis process for producing a dense composite material, At least one elemental material from at least one of the following groups is placed into a die: (1) Ti, Zr, Hf, Ta, Nb, Si and B; (2) C and B; (3) Ni, Ti and Cu; (4) A1, Ti, Fe and Co. An ignitable primer is also placed in the die, after which a uniaxial pressure of between 3.5 and 35 MPa is applied to the elemental material. The pressure is maintained, the material is then heated to a temperature of between 250 and 600°C and the primer is ignited to produce the composite. Method of making shaped ceramic composites with the use of a barrier and articles produced thereby Creber, D.K., Johnson, W.B. and Newkirk, M.S. (Lanxide Technology Company, LP, Newark, DE, USA) US Pat 5 340 655 (23 August 1994) A fibrous preform body is infiltrated with silicon which reacts to form a silicon nitride matrix. Within the resulting composite body there may be either voids or residual silicon. During infiltration the preform is in contact with a barrier of titanium, zirconium or aluminium nitride. This barrier undergoes chemical or physical changes during the infiltration process, and a portion of it adheres to the shaped composite body that is produced in this process. Process for producing shaped articles by starting from reinforced thermoplastic sheets Addeo, A., Vitali, M. and Bonari, R. (Centro Sviluppo Settori Impiego S.r.l., Milan, Italy) US Pat 5 342 463 (30 August 1994) Reinforced thermoplastic sheets are overlaid with a pair of barrier films and placed in two half moulds. The moulds are then clamped together and compressed air is used to force the sheets to bond together, to produce a box-shaped article. Reaction processing of AIN/SiC composites and solid solutions Cameron, C.P. and Rice, R.W. (W.R. Grace & Co.-Conn., New York, NY, USA) US Pat 5 342 562 (30 August 1994) Silicon nitride, elemental aluminium and one or a mixture of elemental carbon and carbonizable binders are mixed together and compacted to form a shape. The whole is reacted together to produce an AIN/SiC composite which is then densified.
COMPOSITES Volume 26 N u m b e r 8 1995
605
UTTERWORTH EINEMANN
Abstracts of Patents
composiws 26 (1995) 605 606 © 1995 Elsevier Science Limited Printed in Great Britain. All rights reserved 0010-4361/95/$10.00
A b s t r a c t s o f U S p a t e n t s p r e p a r e d b y D r R.J. Hand, University o f Sheffield, U K
COMPONENTS Production of composite sandwich structures Cassell, G. (McDonnell Douglas Corporation, Huntingdon Beach, CA, USA) US Pat 5 344 685 (6 September 1994) A contoured shell radome structure comprises inner and outer facings of a glass fibrereinforced resin between which there is a contoured foam core. The foam core consists of straight, relatively stiff, narrow foam mandrels. Fibre-reinforced composite structures, and methods of making same Burgess, K.E. (Techniweave, Inc., Rochester, NH, USA) US Pat 5 346 774 (13 September 1994) A preform for infiltration by a matrix to form a reinforced composite structure, is described. The preform comprises at least two elements which are at an angle to each other and which are made of yarns. Composite moulding apparatus for high pressure co-cure moulding of lightweight honeycomb core composite articles having ramped surfaces utilising low density, stabilised ramped honeycomb cores Dublinski A.C., Carstensen, T.A. and Ramey, P.J. (United Technologies Corporation, Hartford, CT, USA) US Pat 5 354 195 (11 October 1994) The moulding article is composed of a rigid base member and a complementary semirigid mould member, which consists of layers of reinforced tooling material, unreinforced elastomeric material and at least one rigid reinforcement layer. The semi-rigid mould member is flexible during high pressure cocure moulding.
MATERIALS Refractory metal reinforced MoSi2/SiC composite with matched thermal coefficients of expansion Jayashankar, S. and Kaufman, M.J. (University o f Florida, Gainesville, EL, USA) US Pat 5 340 531 (23 August 1994) A silica-free MoSi2 matrix contains a dispersion of SiC and is reinforced with a particulate ductile refractory metal. The thermal expansion coefficient of the MoSi2/SiC matrix is equivalent to that of the refractory metal. Structurally reinforced thermoplastic-fabric composite construction materials that are mouldable Grimnes, M.S. (Brunswick Technologies, Inc., Brunswick, ME, USA) US Pat 4 344 687 (6 September 1994) This thermoplastic-fabric flexible web can be moulded under heat and pressure to form an internally reinforced moulded article. The web comprises at least one thermoplastic resin layer and at least one woven fabric
layer which contains reinforcing fibres. Stitching extends through all the layers so that the whole can be handled as a unit. Carbon fibre prepreg and carbon fibre reinforced resin composite Ide, S., Shimamoto, A., Yutori, T. and Uchimura, M. (Kabushiki Kaisha Kobe Seiko Sho, Kobe, Japan) US Pat 4 344 689 (6 September 1994) A prepreg is described that contains unidirectional carbon fibres, co-directional stranded steel filaments and a matrix resin. The ratio of steel to carbon fibres is 10 vol% or less. The steel filaments have a diameter of 100 ~,m or less and an area reduction at fracture of 20% or more. Fibre-reinforced rubber Nakanishi, Y. (Bando Chemical Industries, Ltd, Kobe, Japan) US Pat 5 346 731 (13 September 1994) Rubber is reinforced with a number of tubular braided cores braided by yarns at a braid angle of between 10 and 35 °. Reinforced silicon carboxide composite with boron nitride coated ceramic fibres Stranford, G.T., Leung, R.Y. and Gonczy, S.T. (Allied-Signal Inc., Morris Township, Morris County, N J, USA) US Pat 5 354 602 (11 October 1994) The composite described comprises a carbon black containing glass ceramic reinforced with refractory fibres that have a boron nitride coating of 0.01 - 5 pm thickness. The glass ceramic has the empirical formula SiCxOy where 0.9 _< x _< 1.6 and 0.7 _
forced coatings o r metal components is described. The blank consists of a number of SiC fibres knitted into a knitted Ti wire mesh with lower and upper wire meshes.
PROCESSES Combustion synthesis process utilising an ignitable primer which is ignited after the application of pressure Stangle, G.C., Niedzialek, S.E. and Williams, W.C. (Alfred University, Alfred, NY, USA) US Pat 5 340 533 (23 August 1994) A combustion synthesis process for producing a dense composite material, At least one elemental material from at least one of the following groups is placed into a die: (1) Ti, Zr, Hf, Ta, Nb, Si and B; (2) C and B; (3) Ni, Ti and Cu; (4) A1, Ti, Fe and Co. An ignitable primer is also placed in the die, after which a uniaxial pressure of between 3.5 and 35 MPa is applied to the elemental material. The pressure is maintained, the material is then heated to a temperature of between 250 and 600°C and the primer is ignited to produce the composite. Method of making shaped ceramic composites with the use of a barrier and articles produced thereby Creber, D.K., Johnson, W.B. and Newkirk, M.S. (Lanxide Technology Company, LP, Newark, DE, USA) US Pat 5 340 655 (23 August 1994) A fibrous preform body is infiltrated with silicon which reacts to form a silicon nitride matrix. Within the resulting composite body there may be either voids or residual silicon. During infiltration the preform is in contact with a barrier of titanium, zirconium or aluminium nitride. This barrier undergoes chemical or physical changes during the infiltration process, and a portion of it adheres to the shaped composite body that is produced in this process. Process for producing shaped articles by starting from reinforced thermoplastic sheets Addeo, A., Vitali, M. and Bonari, R. (Centro Sviluppo Settori Impiego S.r.l., Milan, Italy) US Pat 5 342 463 (30 August 1994) Reinforced thermoplastic sheets are overlaid with a pair of barrier films and placed in two half moulds. The moulds are then clamped together and compressed air is used to force the sheets to bond together, to produce a box-shaped article. Reaction processing of AIN/SiC composites and solid solutions Cameron, C.P. and Rice, R.W. (W.R. Grace & Co.-Conn., New York, NY, USA) US Pat 5 342 562 (30 August 1994) Silicon nitride, elemental aluminium and one or a mixture of elemental carbon and carbonizable binders are mixed together and compacted to form a shape. The whole is reacted together to produce an AIN/SiC composite which is then densified.
COMPOSITES Volume 26 N u m b e r 8 1995
605