Plasma technologies application for building materials surface modification

© Published under licence by IOP Publishing Ltd.Low-temperature plasma modification of LiYF4 crystal surface in Helium atmosphere caused microhardness decreasing and increasing of roughness of crystal surface. The change of microhardness and morphology is a possible result of Fluorine outgoing from material structure due to heating of surface and plasma chemical reactions and ingoing of Oxygen. As a result of exchange and diffusion processes crystal surface structure become more crumbly, its morphology and mechanical properties change

Plasma technologies application for building materials surface modification

Low temperature arc plasma was used to process building surface materials, such as silicate brick, sand lime brick, concrete and wood. It was shown that building surface materials modification with low temperature plasma positively affects frost resistance, water permeability and chemical resistance with high adhesion strength. Short time plasma processing is rather economical than traditional processing thermic methods. Plasma processing makes wood surface uniquely waterproof and gives high operational properties, dimensional and geometrical stability. It also increases compression resistance and decreases inner tensions level in material

Characterization of LiMn2O4 cathodes by electrochemical strain microscopy

Electrochemical strain microscopy (ESM) is a scanning probe microscopy (SPM) method in which the local electrodiffusion is probed via application of AC voltage to the SPM tip and registration of resulting electrochemical strain. Here, we implemented ESM to measure local strain in bulk LiMn2O4 cathodes of a commercial Li-battery in different states of charge to investigate distribution of Li-ion mobility and concentration. Ramped AC ESM imaging and voltage spectroscopy were used to find the most reliable regime of measurements allowing separating and diminishing different contributions to ESM. This is not a trivial task due to complex geometry of the sample and various obstacles resulting in less predictable contributions of different origins into ESM response: electrostatic tip surface interactions, charge injection, electrostriction, and flexoelectricity. Understanding and control of these contributions is an important step towards quantitative interpretation of ESM data

Magnetron discharge volt-ampere characteristic investigation at thin film coating process

© Published under licence by IOP Publishing Ltd. Magnetron discharge at reactive and working gases mixture atmosphere current-voltage characteristic (I-U) for different sputtering parameters is investigated. It is shown, that form of volt-ampere characteristic doesn't depend on gas supply scheme at vacuum chamber pressure 4- 6.10-2 Pa. Reactive gas (oxygen) flow increasing leads to making I-U transition part wider and amplification of difference between top and bottom parts of hysteresis loop I-U. Discharge voltage is less at oxygen and argon gases mixture atmosphere than at argon atmosphere

Magnetron discharge volt-ampere characteristic investigation at thin film coating process

© Published under licence by IOP Publishing Ltd. Magnetron discharge at reactive and working gases mixture atmosphere current-voltage characteristic (I-U) for different sputtering parameters is investigated. It is shown, that form of volt-ampere characteristic doesn't depend on gas supply scheme at vacuum chamber pressure 4- 6.10-2 Pa. Reactive gas (oxygen) flow increasing leads to making I-U transition part wider and amplification of difference between top and bottom parts of hysteresis loop I-U. Discharge voltage is less at oxygen and argon gases mixture atmosphere than at argon atmosphere

Abnormal glow discharge in crossed electric and magnetic fields in the presence of reactive gas

The results of investigations of the low-temperature plasma at process of reactive magnetron sputtering of Ti target in the presence of reactive gas are described. Discharge volt-ampere characteristics for different schemas of reactive gas input are build. Optimal regimes of making strengthening coatings are defined. TiOx (0 < x < 2) strengthening coatings at plastics are made. Coatings showed high consumer qualities. © Published under licence by IOP Publishing Ltd

La Patrie : journal quotidien, politique, commercial et littéraire

31 mars 18681868/03/31 (A28)

Abnormal glow discharge in crossed electric and magnetic fields in the presence of reactive gas

The results of investigations of the low-temperature plasma at process of reactive magnetron sputtering of Ti target in the presence of reactive gas are described. Discharge volt-ampere characteristics for different schemas of reactive gas input are build. Optimal regimes of making strengthening coatings are defined. TiOx (0 < x < 2) strengthening coatings at plastics are made. Coatings showed high consumer qualities. © Published under licence by IOP Publishing Ltd

Blonde Marie / paroles de Frédéric Vergeron ; musique de P. Delaruelle,...

© Published under licence by IOP Publishing Ltd. Magnetron discharge at reactive and working gases mixture atmosphere current-voltage characteristic (I-U) for different sputtering parameters is investigated. It is shown, that form of volt-ampere characteristic doesn't depend on gas supply scheme at vacuum chamber pressure 4- 6.10-2 Pa. Reactive gas (oxygen) flow increasing leads to making I-U transition part wider and amplification of difference between top and bottom parts of hysteresis loop I-U. Discharge voltage is less at oxygen and argon gases mixture atmosphere than at argon atmosphere

Plasma technologies application for building materials surface modification

© Published under licence by IOP Publishing Ltd.Low-temperature plasma modification of LiYF4 crystal surface in Helium atmosphere caused microhardness decreasing and increasing of roughness of crystal surface. The change of microhardness and morphology is a possible result of Fluorine outgoing from material structure due to heating of surface and plasma chemical reactions and ingoing of Oxygen. As a result of exchange and diffusion processes crystal surface structure become more crumbly, its morphology and mechanical properties change