Energy cost improvement of the nitrogen oxides synthesis in a low pressure plasma

Nitrogen oxide is synthetized from a N2-35 % O2 mixture flowing (22 Nl/h) through a microwave discharge. The total pressure is equal to 50 torr. The optimal value of energy consumption, equal to 28 MJ/kg NO, is obtained with catalyst such as MoO3. Results are improved by 53 % in comparison with the industrial process used at present, and by 78 % in comparison with those obtained with a plasma jet arc generator

Lettre du Cardinal Secrétaire d’Etat au Secrétaire de la Propaganda Fide — (7-V-1855)

A cold remote nitrogen plasma (CRNP) equipment is developed in order to improve adhesion quality of plastic surfaces. The volume of the reaction chamber is 160 litres. The concentration of atomic nitrogen, which is the main reactive species of the CRNP is homogeneous in the whole reactor and is about 8 x 10^16 atoms.cm-3. An uniform surface treatment of pieces with complex shapes is obtained. This process, tested in production by an electronic industry leads to an economic cost divided by 2.5 in comparison with chemical treatment

Treatment of polymer surfaces by low pressure microwave plasmas

Improved wettability and adhesion are obtained for polypropylene after brief exposure to a low pressure microwave cold nitrogen plasma which optionally may contain fluorine compounds. This process is used to create adhesion of epoxy resins on polypropylene surfaces for the fabrication of electronic components. It has to take the place of a very expensive and polluting industrial treatment requiring high temperatures for about seven hours. Energy cost is divided by 700. The surfaces of polypropylene have been examined by means of electronic microscopy and XPS. Incorporation of nitrogen in the first surface layers is observed after the plasma treatment with an apparent N/C atomic stoichiometry of about 0.22

Industrial surface treatment of polymers using cold plasmas activated by microwave discharge

Translated from French (Paper no. A5.3 at UIE Int. Conf. Electroheat, Malaga (ES), 3-7 Oct 1988)Available from British Library Document Supply Centre- DSC:6196.3(OA-Trans--2996)T / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo