Search results

In this research work thick‐film manufacturing technology on stainless steel baseplates was developed. Adequate adhesion of dielectric IP211 to the steel substrate was achieved only by sand blast roughening. Standard PdAg thick‐film conductors were not solderable to IP211. The solution was to have a separate multilayer dielectric under conductors to be soldered. The reliability of soft soldering and gold wire bonding of thick‐film metallisation on stainless steel and other baseplate materials was evaluated. The technology developed was applied to manufacturing an intelligent signal node. Present expertise enables the manufacture of thick‐film hybrids on stainless steel baseplates. Development of an industrial production line would, however, involve considerable effort.

A technique whereby the brazing of stainless steels can be carried out in a standard furnace provided with a controlled atmosphere has now been developed by The General Electric Co. Ltd. The process is suitable both for copper‐brazing stainless steels and for brazing components using Nicrobraz alloy as the filler metal.

Fluids management may be defined as the routeing and confinement of fluids, often under extremes of temperature, pressure and working environment. One of the most critical areas of this technology is the supply and transfer of liquids in aerospace fuel systems. Development of fluids management components for aerospace applications is driven by the requirement for total system integrity within the constraints of cost, space, mass, service conditions and material properties. Designers are challenged to produce novel solutions involving 3D simulation and modelling, finite element analysis and rapid prototyping. Simultaneous engineering is now an integral part of the process and designers must be aware of the latest manufacturing techniques and materials, both metallic and non‐metallic. Final design optimization is confirmed by prototype evaluation, followed by rigorous qualification testing. Explores design concepts and introduces some fluids management components in widespread use today. Reviews recent helicopter and non‐metallic material developments and discusses the future of the technology.

A flexible stainless steel hose assembly is of special interest as it has been specifically designed for the transfer of liquid gases from mobile ground tankers to aircraft storage tanks.

Oxalate coating process. The Pyrene Co. Ltd. announce the availability of their new oxalate coating process, Bonderite SS4, for assisting the cold drawing of stainless steel and heat‐resisting alloys.

Salt Spray Cabinets. A whole new range of Salt Spray cabinets and Sulphur Dioxide cabinets are available from John Godrich, Consulting Engineers. These include the standard but improved STR range of chest‐type Salt Spray cabinets in 400 or 1000 litre capacity but an addition to these is the new STK range which can carry out sulphur dioxide testing as well to conform to the DIN, BS and Kesternich standard test. This is now a feature of all the Liebisch Salt Spray cabinets and indeed on the cabinet type (front opening door) these can now be produced with a micro‐processor programmer to give common salt, acetic acid and sulphur dioxide testing all within one cabinet, which is fully programmable and has an automatic changing system from one test to another without operator assistance. Another addition to the range is the SL‐2000 front opening cabinet of 2000 litre capacity having a length of approximately 2 metres, a height of just over 1 metre and a depth of .89 metre. This is useful for testing the longer type sample and again can have the features mentioned above for sulphur dioxide and automatic change over systems.

Airtech Ltd. will be exhibiting products from the Electronics and the Systems Engineering Divisions. Among the electronics items will be a transistorised monitor oscilloscope, 6‐channel ground/air data link, which was developed for B.L.E.U., Bedford, a selection of R.F.I. filters and a number of antenna duplexer units.

The Hawker Siddeley HS 125–700 is a low‐wing, twin engined, eight‐to‐fourteen seat business jet.