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Proceedings Papers
ITSC1999, Thermal Spray 1999: Proceedings from the United Thermal Spray Conference, 86-89, March 17–19, 1999,
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Metallic coatings as protection against extraordinary attack of mechanical wear mechanisms such as welded layers or sintered coatings are wordwide standardized. There exists a lot of empirical knowledge, but no exact method is known to foresee the grade of wear in dependance of all important influences in tribological systems. Paper text in German.
Proceedings Papers
ITSC1999, Thermal Spray 1999: Proceedings from the United Thermal Spray Conference, 90-94, March 17–19, 1999,
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The development and introduction of more advanced spray systems continues to drive the thermal spray market. Most of these developments benefit from an increase in particle velocities. The latest generation of HVOF systems can spray cermet coatings of higher density and higher hardness, wear resistance and corrosion resistance than HVOF systems introduced previously, due to an 30 to 50 % increase in particle velocity. HVAF systems are offered as an cost-effective alternative to HVOF systems. A further increase in particle velocity and the introduction of cold gas spraying can be seen as a transition from thermal to kinetic spraying and may open a wide field of new applications for coatings and structures of oxidation sensitive materials. Advances are also reported for wire spraying. New arc spray systems are capable to increase the density of metal and alloy coatings considerably and to reduce the oxide content of these coatings. Similar improvements but at lower spray rates may be achieved with newly developed HVOF wire systems. Paper text in German.
Proceedings Papers
ITSC1999, Thermal Spray 1999: Proceedings from the United Thermal Spray Conference, 95-105, March 17–19, 1999,
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Knowledge of the production, the properties and the relevant regulations for industrial gases are a prerequisite for the smooth application of thermal spraying in manufacturing and research. This is why corresponding supply concepts for this coating technology were developed. These have proven extremely successful in their practical application and they ensure the user the necessary gas purity at any time. The following article serves to inform the readers about the underlying principles of gas technology and to clearly show that, in the respective specialist gas industry, they have the right partner for solving their coating problems. Paper text in German.
Proceedings Papers
ITSC1999, Thermal Spray 1999: Proceedings from the United Thermal Spray Conference, 106-110, March 17–19, 1999,
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Structural damage caused by corrosion in concrete structures is widespread and requires extensive repair work. The installation of corrosion protection systems for constructions that are under unfavorable conditions is urgently necessary. Thermally sprayed coatings serving as anode have been developed from the cathodic protection of steel. These systems have attracted attention because of their performance and lower cost advantages, and they are about to enter the competitive anode system market. Thermally sprayed zinc coatings are applied to the surfaces of steel-reinforced concrete components that are affected by corrosion. In this article, the ability of the system to deliver a protective current is verified by field tests in a marine structure in the Arabian Gulf that was discussed in 1997. Paper includes a German-language abstract.
Proceedings Papers
ITSC1999, Thermal Spray 1999: Proceedings from the United Thermal Spray Conference, 111-116, March 17–19, 1999,
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The waste management and practice of reuse of cooling lubricant containing grinding swarf has become a problem of rising importance due to introduction of the law of recycling economics in October 1996. Grinding swarf is a significant set of arising residual material in the metal working industry (about 250.000 t/a). The recycling of this material on the highest extent was object of researches carried out by a working group at the IWT together with the IFAM, accompanied by the Federal Environmental Agency. Target was the preparation of the solid fraction of grinding swarf for reuse as basic material in processes for powder metallurgy and thermal spraying. The produced materials were investigated for their principle applicability to technological problems. Coatings produced from grinding swarf by atmospheric plasma spraying exhibit high hardness and an increased wear resistance. Remaining difficulties are the supply with base materials of constant quality and the resulting instabilities in the coating process and quality of the coatings. Paper text in German.