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Aviation History
1956
1956 - 0092.PDF
92 FLIGHT, 20 January 1956 AIRCRAFT AND CERAJMIGS Protective Coatings for Use During Heat Treatment.— Another processing problem of titanium alloys is their protec-tion from embrittlement during heat treatment. The use of reducing atmospheres during heat treatment, as in the case ofSteels, is not satisfactory, because at elevated temperatures titanium is also embrittled by nitrogen and hydrogen. Vacuum, or inert-gas atmosphere, furnaces would prevent embrittlernent, but their use would be expensive and awkward for production processing.Therefore, we are currently investigating the use of ceramic coatings which will protect the titanium during heat treatment,and it has been found that certain coatings provide satisfactory protection up to 1,650 deg F for half an hour. These coatingsare readily removed after heat treatment of the parts. High-temperature Jigs and Fixtures.—Considering the num-ber of elevated-temperature processing operations required in the fabrication of the various alloys to be used in the future itis apparent that there will be a need for jigs, fixtures, and dies which will be resistant to elevated temperatures. Refractoryjigs and fixtures will be satisfactory for many applications, but there will be others where high-temperature ceramic coatings will allow the iuse| of metal-fixtures. There are available an increasing number' of cast irons ard wrought alloys with satis- factory strength at elevated temperatures but requiring protec- tion against oxidation. Ceramic Adhewves.-rSpmewhat jemqved from enamelling, fc'tttcertainly of interest to frit manufacturers, is the' possible use Of enamel glasses as elevated-temperature resistant adhesives. Webegan to study this possibility when it became evident that organic adhesives would be unsatisfactory for use in future "high-temperature" aircraft. The first alternative is brazing and this is currently under study by a number of companies. Since thebrazing operations take place at 1,900 deg F to 2,000 deg F 'many problems (such as atmosphere control in large furnaces, jigand fixture materials, control of time at temperature for complex assemblies and subsequent heat treatment of the assemblies)remain to be overcome. In attempting to develop satisfactory ceramic adhesives we felt that the disadvantage of a brittleceramic bond might be outweighed by the advantages of lower processing temperatures, less critical atmosphere control and thereadily controllable working properties of molten glasses. We have obtained some promising results. THE INDUSTRY Avro Personnel Appointment APPOINTED personnel man-• ager of A. V. Roe and Co., Ltd., is Mr. John Gee, whojoins them in advance of the impending retirement of Mr.Frank Greenhalgh, labour super- intendent, who has been with thecompany for some 40 years. Mr. Gee, who for the past three-and-a-half years has been personnel manager of Platts (Barton), Ltd.,is no stranger to Avro products, for he flew Lancasters in No. 153Sqn., Bomber Command, during the war. He completed morethan sixty operational sorties and was awarded a D.F.C. and Bar. Mr. John Gee. Sales Manager at Vintens ^ |N his retirement from theactive list, S/L. D. J. ("Don") Munro has taken up anappointment with W. Vinten, Ltd. (manufacturers of cinecameras and associated equip- ment), as sales manager. For thewhole of his 36 years' service with the Royal Air Force S/L.Munro has been associated with photography. He has first-handexperience of all aspects of the problems involved in photo-graphic reconnaissance in the air and pictorial production onthe ground, both at home and overseas. After serving as aphotographic instructor at a number of Service schools, hewas selected for service with the Ministry of Supply, R.D. Photos, and subsequently with A.C.A.S.(O.R.), Air Ministry, where hewas concerned with photographic operational requirements. S.B.A.C. Materials Data TTHE Society of British Aircraft Constructors has prepared a-•- second issue of S.B.A.C. Materials Data Sheet MAT. 1— Schedule of Steel Bars and Forgings. Amended in detail, itintroduces chromium-molybdenum S.I 06 and chromium- molybdenum-vanadium D.T.D.730 (primarily nitriding specifica-tions), into the general alloys category in order to draw attention to the usefulness of these alloys, particularly when nickel is inshort supply. The Materials Data Sheets provide a key to the B.S. and D.T.D.material specifications currently used by the industry, with information on mechanical properties and—a particularly usefulfeature—a reference to the specifications which they replace. The range of data sheets at present available is: MAT. 1, Steel S/L. Munro. bars and forgings; MAT. 2, Aluminium Alloy Sheet and Strip;MAT. 3, Aluminium Alloy Castings; MAT. 4, Aluminium Alloy Bars, Forgings and Extruded Sections; MAT. 5, AluminiumAlloy Tubes. Copies may be obtained from the offices of the Society at29 King Street, St. James's, London, S.W.I., price Is each sheet or 5s the set of five. IN BRIEF A member of the Board of High Duty Alloys, Ltd., since 1951,Mr. Gilbert Hunt has been appointed general manager. * * * Bakelite, Ltd., announce the appointment of Mr. R. Hart Still to the Board, and of Mr. A. J. Hearn as chief accountant. * * * Mr. J. Hanford Stevens, Assistant Secretary (Aircraft Produc-tion) of the Australian Department of Defence Production, has resigned from Government service in order to join the FirthCleveland Group as managing director of their Australian sub- sidiary, Simmonds Aerocessories Pty., Ltd., of Ballarat, Victoria. This Model 9 Mk 12 9in landing lamp by Harley Aircraft Land- ing Lamps, of St. Neots, Hunts, gives a powerful beam with a wide, dif- fused spread at the edges. Extension is by means of a Plessey elec- tric actuator. A lamp of this type is fitted on the Short Seamew. A permanent exhibition by member-firms is to be opened on February 9th by the Scientific Instrument Manufacturers' Association at their headquarters at 20 Queen Anne Street, London, W.I. * * * Mr. T. R. Hardman has been appointed general manager ofTecalemit, Ltd., lubrication equipment manufacturers of Plymouth and Brentford. Now 43 years of age, Mr. Hardmanjoined the Tecalemit Brentford works in 1941 as a draughtsman. He became chief draughtsman in 1946, and was later madeassistant to the technical director. * * * Samuel Fox and Co., Ltd., announce two new appointments.Mr. C. M. Slocombe has been elected to the Board, and Mr. A. C. Brierley, at present in the United Steel Companies' exportdepartment, has been appointed to succeed Mr. J. H. Goodlad as sales manager for light steel.
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