Abstract: The present invention relates to a process for the surface treatment of poly(aryl ether ketone)s (PAEKs) comprising the following steps: Providing an article comprising one or more poly(aryl ether ketone)s (PAEKs); contacting at least one portion of the surface of the article containing one or more poly(aryl ether ketone)s (PAEKs) with an aldehyde, wherein the aldehyde reacts with the poly(aryl ether ketone)(s) (PAEKs) on the at least one portion of the surface of the article to form a hydroxyalkyl and/or hydroxyaryl group, a process for functionalizing surface-treated poly(aryl ether ketone)s (PAEKs) comprising the steps of: a) Treating at least one portion of the surface of an article containing one or more poly(aryl ether ketone)s (PAEKs) with the surface treatment process for poly(aryl ether ketone)s (PAEKs) described herein; b) Coating the treated at least one portion of the surface of the article with a composition comprising a chemical compound having chemical groups capable of forming a covale

Abstract: A coated piston ring having a base body of chromium steel with more than 10 wt.-% chromium and having an inner circumferential surface, a first flank surface, a second flank surface and an outer circumferential surface. The first flank surface comprises a nitride diffusion layer with a layer thickness of from 5-300 ?m, a nitride connecting layer with a layer thickness of from 0.5-15 ?m on the nitride diffusion layer, and an oxide layer with a layer thickness of from 0.05-3 ?m on the nitride connecting layer. The second flank surface comprises the nitride diffusion layer, and the outer circumferential surface comprises the nitride diffusion layer and a chromium solid particle layer with 0.1-30 vol.-% solid particles, relative to the total volume of the chromium solid particle layer on the nitride diffusion layer.

Abstract: A three-dimensional, porous structure made of fragments of a nanofibre web is provided. Furthermore, a method for the production of a three-dimensional, porous structure made of nanofibre web fragments is proposed. The three-dimensional, porous structure is used for example in medicine, preferably in regenerative medicine. Furthermore, the structure according to the invention made of fragments of a nanofibre web can be used for the treatment of tissue damage, for the immobilisation of biological cells, for the construction of biological tissue and as a biological filler in vitro and also in vivo.

Abstract: A coated piston ring having a base body of chromium steel with more than 10 wt.-% chromium and having an inner circumferential surface, a first flank surface, a second flank surface and an outer circumferential surface. The first flank surface comprises a nitride diffusion layer with a layer thickness of from 5-300 ?m, a nitride connecting layer with a layer thickness of from 0.5-15 ?m on the nitride diffusion layer, and an oxide layer with a layer thickness of from 0.05-3 ?m on the nitride connecting layer. The second flank surface comprises the nitride diffusion layer, and the outer circumferential surface comprises the nitride diffusion layer and a chromium solid particle layer with 0.1-30 vol.-% solid particles, relative to the total volume of the chromium solid particle layer on the nitride diffusion layer.

Abstract: A piston ring, in particular a compression piston ring, includes a running surface, upper and lower flank areas, an inner peripheral area and a joint. The wall thickness of the piston ring is uniform over its periphery and at least the running surface is provided with a PVD coating or a CVD layer in such a manner that the running surface layer has a lesser layer thickness in the peripheral area close to the joint than in the remaining peripheral area of the running surface.

Abstract: A piston ring, in particular a compression piston ring, includes a running surface, upper and lower flank areas, an inner peripheral area and a joint. The wall thickness of the piston ring is uniform over its periphery and at least the running surface is provided with a PVD coating or a CVD layer in such a manner that the running surface layer has a lesser layer thickness in the peripheral area close to the joint than in the remaining peripheral area of the running surface.

Abstract: A piston ring includes a running surface having a running surface profile, and an upper flank surface and a lower flank surface. At least the running surface is provided with a vapor-deposited layer such that part of the running surface is provided with a removable cover enabling an essentially sharp-edged running edge to be formed between the running surface and at least one of the flank surfaces, once the vapor-deposited layer has been produced and the cover has been removed.

Abstract: A wet cylinder liner, which exhibits a cast basic body comprised of a cast iron alloy, has at least one outer surface area of which exhibits a thermal injection layer consisting of a basic iron alloy as a coating, with a layer thickness of 1 ?m to 1000 ?m.

Abstract: The invention relates to a piston ring which has at least one bearing surface and an upper and a lower flank. The bearing surface is provided with a High Velocity Oxygen Fuel (HVOF) coating which has a surface roughness Rk<0.1 ?m.

Abstract: A piston ring includes a running surface having a running surface profile, and an upper flank surface and a lower flank surface. At least the running surface is provided with a vapor-deposited layer such that part of the running surface is provided with a removable cover enabling an essentially sharp-edged running edge to be formed between the running surface and at least one of the flank surfaces, once the vapor-deposited layer has been produced and the cover has been removed.

Abstract: The invention relates to a wear protection layer for piston rings in internal combustion engines consisting essentially of chromium carbides, wolfram carbide, chromium and nickel. The wear protection layer is formed from a mixture of powders in which the first powder consists of at least the alloy components chromium carbide, chromium and nickel, in the form of an agglomerated and sintered powder, and which has not been subjected to any secondary heat treatment that would make the powder brittle, such as plasma refinement, the carbides in the powder having an average diameter of essentially not more than 3 ?m. A second powder, also in the form of an agglomerated and sintered powder, contains wolfram carbide and is applied to at least one peripheral surface of the piston rings by thermal injection, so that two distinctive coating areas are produced in the wear protection layer. A first area, predominantly rich in chromium, and a second area, mainly rich in wolfram carbide are formed.

Abstract: The invention relates to a wear-resistant coating used for bearing surfaces and flanks of piston rings in internal combustion engines. The wear-resistant inventive coating is obtained by mechanically alloying powders which form a metallic matrix with hard material dispersoids and lubricant material dispersoids. The coating is then thermally applied to the workpieces, especially by means of high velocity oxygen fuel spraying (HVOF). The workpieces coated are bearing surfaces and parts of flanks pertaining to piston rings in internal combustion engines.

Abstract: Protective layer for piston rings in internal combustion machines, essentially consisting of chromium carbides, tungsten carbide, chromium and nickel, whereby the protective layer against wear and tear is formed of a powder mixture in which the first powder exists as agglomerated and sintered powder made out of at least the alloy components chromium carbide, chromium and nickel, which has not experienced any subsequent embrittling heat treatment such as e.g.

Abstract: The invention relates to a wear-resistant coating used for bearing surfaces and flanks of piston rings in internal combustion engines. The wear-resistant inventive coating is obtained by mechanically alloying powders which form a metallic matrix with hard material dispersoids and lubricant material dispersoids. The coating is then thermally applied to the workpieces, especially by means of high velocity oxygen fuel spraying (HVOF). The workpieces coated are bearing surfaces and parts of flanks pertaining to piston rings in internal combustion engines.