Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You and Your Team.

Learn More →

New Materials

New Materials Lubricating Compound An anti-seizing lubricating medium is being manu­ factured by Crane Packing Ltd. It is known as Thred- Gard. The underlying principle is the formation of a low shear-strength metallic film on the Brief Particulars of Recently Introduced Materials associated surfaces based on the constituent element, molybdenum disulphide. This metallic constituent in Likely to have Aircraft Applications combination with the other ingredients in effect plates the surface during the action of their contact; the greater the specific loading the more pronounced is the affinity for attachment, and the consequent sheet for the anti-icing and de-icing of aircraft using Plastic Metal Filler lowering of the coefficient of friction. hot air. A cold-setting plastic metal amalgam—Hermetal— This result is independent of temperature. The In the anti-icing system, intended principally for use is produced by the Kenilworth Manufacturing Co. compound can be used for the prevention of seizing on gas turbine powered aircraft, compressor bleed air Ltd. of West Drayton, Middlesex. Its principal appli­ of screw threaded connexions, and as a lubricant in at temperatures of 400 to 700 deg. F is ducted cations are found in the repair of dents, cracks, drawing, broaching, spinning, tapping and similar directly to the plenum chamber which extends the scratches or holes in metals. In addition to its use as a operations. full length of the wing leading edge which is made of filler it can also be employed to build up continuous the porous metal. Substantial weight and power flats or curves, and to conceal rivets, screws and any Chronic Plating Aluminium Cylinders savings are observed compared with other available kind of joint or scam. It can be applied to iron, steel, de-icing methods. By agreement with Mahle-K.G., Sheepbridge wood, glass, and all non-ferrous metals, including The porous metal itself retains its strength at tem­ Engineering Ltd. will operate in this country the aluminium, and sets like lead. The filler can be painted, peratures in excess of 600 deg. F. It can be formed, process by which it is possible to deposit hard chrom­ and is proof against heat and shrinkage, as well as machined, and riveted in much the same way as high ium directly on to aluminium alloys. water, oil and petrol. strength aluminium alloys. Construction of a leading It is packed in two tins, one containing the powder, edge in porous stainless steel is little different from the other the solvent, in order to avoid wastage. standard construction using aluminium skin, and Samples were tested at the National Physical Labor­ much simplified compared with an aluminium double atory by joining two 6 in. lengths of 1/32 in. thick skin such as is used for hot air anti-icing. A saving in metal strip with glass fibre cloth bonded to the metal weight results from the higher strength of the porous with the plastic metal used as an adhesive. Each test metal compared with aluminium at high temperatures, piece was about 13 in. long by 2 in. wide, with a gap and from the simplified ducting which is possible with between the ends of the two metal strips of 1 in. The this system. gap was bridged by a piece of glass cloth cemented to Savings in power result from the thermodynamic the metal over a distance of 1 in. on each side. The efficiency of the system, which is much greater than effective contact area was therefore 4 square inches. that of a double skin hot air de-icing system. Four samples A1, A2, C1 and C2 were joined with The appearance of the porous material is similar to the standard Hermetal powder and fluid. B1 and B2 that of polished aluminium. Sheet sizes up to 18 in. by employed Hermetal powder and a different fluid; D1 72 in. are available. was joined by another well-known product in the same field. Hot Spray for Anti-Corrosive Compounds The ends of the test pieces were held in wedge The difficulties of effective spraying of anti-corrosive grips in a 2,250-lb. tensile testing machine. The rate of compounds are well known. In order to overcome separation of the loading jaws was 4 in. per minute. these problems the Regent Oil Co. Ltd. and the Atlas The following table gives the results: Diesel Co. Ltd. have recently co-operated in develop­ ing a hot spray method for applying semi-solid anti- Breaking corrosive compounds. The process is the result of Senders Load Remarks experiments with the Regent Oil Co.'s Caltex Rust­ Recent German technical developments result in in­ Mark lb. proof Compound L and the Atlas Diesel Co.'s KV3 creased engine efficiency. Previously, aluminium cylin­ Cup Heater and Ecco 306 Spray Gun. ders have had to be fitted with cast iron or steel liners. A1 Cloth broken in free lengths Compound L, a semi-solid, is a blend of mineral The use of chromium plated aluminium cylinders and pulled away from adhe­ oils and petroleum jelly containing special additives, avoids a large difference in thermal expansion between sive in one corner. which make it non-drying, flexible and highly adhesive. piston and cylinder, provides a good wear-resisting A2 800 do. It can be sprayed on a surface that is not completely surface and one which is more resistant to corrosion B1 830 do. free of moisture. The film or coating absorbs any than cast iron, as well as greatly improving heat flow. B2 880 do. moisture and expels it to the outer surface where it With a chrome plated cylinder block the piston as­ C1 615 do. evaporates. sembly may be fitted with much closer working toler­ C2 675 do. ances than are possible in the cast iron sleeved engine, Fabric unbroken; poor D1 340 Epoxy Resins for Plastic Patterns enabling greatly increased efficiency to be obtained adhesion between cloth and Epoxy resins are now being produced for making from the cylinder. adhesive. plastic patterns, and appear to offer marked advant­ ages over other resins that have been tested for this Silicone Electrical Insulation The makers of Hermetal point out that it is not purpose. Aero Research Ltd., who are responsible for A wide range of electrical insulating materials is primarily an adhesive like glue or solder, but is de­ the development of Araldite casting resin M for pat­ being produced by manufacturers from resins, elas­ signed primarily as a filling medium. tern making, state that shrinkage on setting is very tomers, fluids and greases supplied by Midland low indeed and negligible when fillers are used. It is Silicones Ltd. The materials vary from thin flexible Porous Metal De-icing Material also claimed that the hardened resin is tough, durable sheets and sleeving to rigid structural components Aircraft Porous Media, Inc. of Glen Gove, N.Y. and dimensionally stable. The resin sets cold in twenty- which may be over one inch in thickness. Also included have produced high strength porous stainless steel four hours, or in a shorter time if gentle heat is applied. are insulated winding wires and power cables. Silicone insulation has good thermal stability, low dielectric loss, resistance to tracking and charring and a high degree of water repellence. It is relatively inert chemically. Silastometer 132 is a new silicone rubber stock for coating woven fabrics from solvent dispersion. Glass- cloth coated with it has great flexibility and high con­ tinuous electric strength at high temperatures. Extruded PTFE Crane Packing Ltd. of Slough has recently com­ pleted a plant for the extrusion of PTFE, in rods and tubes up to an external diameter of four inches. Tube of this diameter has a minimum wall thickness of J in. and is supplied in standard lengths of three feet. Minimum diameter of both rod and tube is ⅝ in. outside diameter. Other forms of PTFE are cord and tape, rounds, disks, cylinders, rings and flat sheets. The material is still relatively scarce and expensive. PTFE is used for gland packings in pumps, valves and similar equipment, and as electrical insulation. It is chemically inert and resists the action of most solvents and other chemicals. It has a low friction coefficient, is non-wetting and is unaffected by surface condensation. The material is non-adhesive, and has some degree of resilience and flexibility; it also pos­ sesses high dielectric strength and a low power factor. The working temperature range is —60 deg. F to +450 deg. F. 166 Aircraft Engineering http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Aircraft Engineering and Aerospace Technology Emerald Publishing

New Materials

Aircraft Engineering and Aerospace Technology , Volume 27 (5): 1 – May 1, 1955

Loading next page...
 
/lp/emerald-publishing/new-materials-zsLLRNgVsE
Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0002-2667
DOI
10.1108/eb032555
Publisher site
See Article on Publisher Site

Abstract

Lubricating Compound An anti-seizing lubricating medium is being manu­ factured by Crane Packing Ltd. It is known as Thred- Gard. The underlying principle is the formation of a low shear-strength metallic film on the Brief Particulars of Recently Introduced Materials associated surfaces based on the constituent element, molybdenum disulphide. This metallic constituent in Likely to have Aircraft Applications combination with the other ingredients in effect plates the surface during the action of their contact; the greater the specific loading the more pronounced is the affinity for attachment, and the consequent sheet for the anti-icing and de-icing of aircraft using Plastic Metal Filler lowering of the coefficient of friction. hot air. A cold-setting plastic metal amalgam—Hermetal— This result is independent of temperature. The In the anti-icing system, intended principally for use is produced by the Kenilworth Manufacturing Co. compound can be used for the prevention of seizing on gas turbine powered aircraft, compressor bleed air Ltd. of West Drayton, Middlesex. Its principal appli­ of screw threaded connexions, and as a lubricant in at temperatures of 400 to 700 deg. F is ducted cations are found in the repair of dents, cracks, drawing, broaching, spinning, tapping and similar directly to the plenum chamber which extends the scratches or holes in metals. In addition to its use as a operations. full length of the wing leading edge which is made of filler it can also be employed to build up continuous the porous metal. Substantial weight and power flats or curves, and to conceal rivets, screws and any Chronic Plating Aluminium Cylinders savings are observed compared with other available kind of joint or scam. It can be applied to iron, steel, de-icing methods. By agreement with Mahle-K.G., Sheepbridge wood, glass, and all non-ferrous metals, including The porous metal itself retains its strength at tem­ Engineering Ltd. will operate in this country the aluminium, and sets like lead. The filler can be painted, peratures in excess of 600 deg. F. It can be formed, process by which it is possible to deposit hard chrom­ and is proof against heat and shrinkage, as well as machined, and riveted in much the same way as high ium directly on to aluminium alloys. water, oil and petrol. strength aluminium alloys. Construction of a leading It is packed in two tins, one containing the powder, edge in porous stainless steel is little different from the other the solvent, in order to avoid wastage. standard construction using aluminium skin, and Samples were tested at the National Physical Labor­ much simplified compared with an aluminium double atory by joining two 6 in. lengths of 1/32 in. thick skin such as is used for hot air anti-icing. A saving in metal strip with glass fibre cloth bonded to the metal weight results from the higher strength of the porous with the plastic metal used as an adhesive. Each test metal compared with aluminium at high temperatures, piece was about 13 in. long by 2 in. wide, with a gap and from the simplified ducting which is possible with between the ends of the two metal strips of 1 in. The this system. gap was bridged by a piece of glass cloth cemented to Savings in power result from the thermodynamic the metal over a distance of 1 in. on each side. The efficiency of the system, which is much greater than effective contact area was therefore 4 square inches. that of a double skin hot air de-icing system. Four samples A1, A2, C1 and C2 were joined with The appearance of the porous material is similar to the standard Hermetal powder and fluid. B1 and B2 that of polished aluminium. Sheet sizes up to 18 in. by employed Hermetal powder and a different fluid; D1 72 in. are available. was joined by another well-known product in the same field. Hot Spray for Anti-Corrosive Compounds The ends of the test pieces were held in wedge The difficulties of effective spraying of anti-corrosive grips in a 2,250-lb. tensile testing machine. The rate of compounds are well known. In order to overcome separation of the loading jaws was 4 in. per minute. these problems the Regent Oil Co. Ltd. and the Atlas The following table gives the results: Diesel Co. Ltd. have recently co-operated in develop­ ing a hot spray method for applying semi-solid anti- Breaking corrosive compounds. The process is the result of Senders Load Remarks experiments with the Regent Oil Co.'s Caltex Rust­ Recent German technical developments result in in­ Mark lb. proof Compound L and the Atlas Diesel Co.'s KV3 creased engine efficiency. Previously, aluminium cylin­ Cup Heater and Ecco 306 Spray Gun. ders have had to be fitted with cast iron or steel liners. A1 Cloth broken in free lengths Compound L, a semi-solid, is a blend of mineral The use of chromium plated aluminium cylinders and pulled away from adhe­ oils and petroleum jelly containing special additives, avoids a large difference in thermal expansion between sive in one corner. which make it non-drying, flexible and highly adhesive. piston and cylinder, provides a good wear-resisting A2 800 do. It can be sprayed on a surface that is not completely surface and one which is more resistant to corrosion B1 830 do. free of moisture. The film or coating absorbs any than cast iron, as well as greatly improving heat flow. B2 880 do. moisture and expels it to the outer surface where it With a chrome plated cylinder block the piston as­ C1 615 do. evaporates. sembly may be fitted with much closer working toler­ C2 675 do. ances than are possible in the cast iron sleeved engine, Fabric unbroken; poor D1 340 Epoxy Resins for Plastic Patterns enabling greatly increased efficiency to be obtained adhesion between cloth and Epoxy resins are now being produced for making from the cylinder. adhesive. plastic patterns, and appear to offer marked advant­ ages over other resins that have been tested for this Silicone Electrical Insulation The makers of Hermetal point out that it is not purpose. Aero Research Ltd., who are responsible for A wide range of electrical insulating materials is primarily an adhesive like glue or solder, but is de­ the development of Araldite casting resin M for pat­ being produced by manufacturers from resins, elas­ signed primarily as a filling medium. tern making, state that shrinkage on setting is very tomers, fluids and greases supplied by Midland low indeed and negligible when fillers are used. It is Silicones Ltd. The materials vary from thin flexible Porous Metal De-icing Material also claimed that the hardened resin is tough, durable sheets and sleeving to rigid structural components Aircraft Porous Media, Inc. of Glen Gove, N.Y. and dimensionally stable. The resin sets cold in twenty- which may be over one inch in thickness. Also included have produced high strength porous stainless steel four hours, or in a shorter time if gentle heat is applied. are insulated winding wires and power cables. Silicone insulation has good thermal stability, low dielectric loss, resistance to tracking and charring and a high degree of water repellence. It is relatively inert chemically. Silastometer 132 is a new silicone rubber stock for coating woven fabrics from solvent dispersion. Glass- cloth coated with it has great flexibility and high con­ tinuous electric strength at high temperatures. Extruded PTFE Crane Packing Ltd. of Slough has recently com­ pleted a plant for the extrusion of PTFE, in rods and tubes up to an external diameter of four inches. Tube of this diameter has a minimum wall thickness of J in. and is supplied in standard lengths of three feet. Minimum diameter of both rod and tube is ⅝ in. outside diameter. Other forms of PTFE are cord and tape, rounds, disks, cylinders, rings and flat sheets. The material is still relatively scarce and expensive. PTFE is used for gland packings in pumps, valves and similar equipment, and as electrical insulation. It is chemically inert and resists the action of most solvents and other chemicals. It has a low friction coefficient, is non-wetting and is unaffected by surface condensation. The material is non-adhesive, and has some degree of resilience and flexibility; it also pos­ sesses high dielectric strength and a low power factor. The working temperature range is —60 deg. F to +450 deg. F. 166 Aircraft Engineering

Journal

Aircraft Engineering and Aerospace TechnologyEmerald Publishing

Published: May 1, 1955

There are no references for this article.