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The thermal spraying technique of High-Velocity Oxygen Fuel (HVOF) coating was used to deposit coatings of an alloy composed of Ni-based substrates on stainless steel AISI 304. The aim of this study was to determine the mechanical properties such as hardness and bond strength that these coatings have when the spray distance is varied, as well as the microstructure and phases formed during the thermal spray process.

The coatings were applied by HVOF and characterized by scanning electron microscopy, image analysis, X-ray diffraction, microhardness and bond strength to analyze the mechanical properties.

The microstructure of the coatings showed low porosity, oxide content and interface contamination in the substrate–coating interface, without the presence of unmolten particles. The microhardness values reached 600 HV for the three spray distances used and the bond strength values reached over 55 MPa.

The use of coatings on aircraft components is growing dramatically owing to the high costs of advanced materials and the growing lifecycle requirements for high-performance systems, which are taken into account because of the variety of coatings and complexity of environmental factors.

The originality of this study lies in the development of new coating materials for the manufacture and protection of various turbine components. The value is based on the development of materials and processes to be used to manufacture them.

A joint development effort between the British Aerospace Aircraft Group's Weybridge‐Bristol Division, Dasic International (Romsey, Hampshire) and Vacu‐Blast International (Slough, Berks), has resulted in the increasing adoption of the Dasic “Paintblast” system by the UK aerospace industry. Some twelve installations are currently in operation and many more home and overseas orders are in the pipeline.

The aerospace industry relies heavily on protective treatments and processes to ensure that the structural integrity of an aircraft is not degraded in service as a result of operating under harsh corrosive conditions. Many of the chemicals and processes currently employed in metal finishing have been found to cause pollution and long‐term damage to the environment. Legislation and international agreements are now in place which ultimately will lead to a ban or major reduction in the use of many of these processes and coatings. The aircraft constructors and operators are seeking to adopt new protective schemes and treatments which will satisfy future environmental requirements.

One of a series of papers presented at a Symposium on the Cost Effectiveness of Sprayed Metal Coatings, organised by the Association of Metal Sprayers.

This paper focuses on the importance of printed circuit boards (PCBs) as components in aircraft and how their failure, either by corrosion or in electronics, can result in catastrophic losses. Reviews some typical experiences and various failures with PCBs, and the attempts to protect them using conformal coatings, and also stresses that this is of increasing importance as these systems become smaller.

THE second flame plating plant to be established in the United Kingdom was brought into service earlier this year at Glossop in Derbyshire. Forming part of the Engineering Products Division of Union Carbide Ltd., these new facilities will, when fully equipped, treble the flame plating capacity available in the U.K., the first plant having been established in the U.K. at Warwick in the late 1950s. This latest development consists primarily of four soundproofed gun compartments, each measuring 18 ft. x 18 ft., and, initially, two guns which with associated equipment represents an investment of £200,000. A further two flame plating guns will be installed by 1967.