Abstract:
Medical instruments, particularly, endodontic instruments with unique limited memory characteristics, and methods for making such instruments. One embodiment includes heat treating a finished endodontic instrument. A related embodiment includes electropolishing a finished endodontic instrument and then heat treating the endodontic instrument.
Abstract:
Methods for modifying a physical characteristic of finished endodontic instruments made from one or more superelastic alloys is described which include heat treating one or more finished endodontic instruments in a salt bath for a specific time (e.g., from about four hours to about six hours), at a specified temperature (e.g., from about 475° C. to about 550° C.), and preferably at a specified pH range.
Abstract:
Medical instruments, particularly, endodontic instruments with unique limited memory characteristics, and methods for making such instruments. One embodiment includes heat treating a finished endodontic instrument. A related embodiment includes electropolishing a finished endodontic instrument and then heat treating the endodontic instrument.
Abstract:
A wire used in the medical field for guiding purposes, as well as in other fields, such as in the field of orthodontics for teeth aligning purposes. The wire, when prepared for use in such applications, exhibits an innovative blend of advantageous properties, including enhanced kink resistance over stainless steel wires and enhanced stiffness over Nitinol wires, which enhance its use as a medical guidewire or stylet, and further, as an arch wire in orthodontia applications.
Abstract:
The invention relates to a method for manufacturing a ferritic-austenitic stainless steel having good formability and high elongation. The stainless steel is heat treated so that the microstructure of the stainless steel contains 45-75% austenite in the heat treated condition, the remaining microstructure being ferrite, and the measured Md30 temperature of the stainless steel is adjusted between 0 and 50° C. in order to utilize the transformation induced plasticity (TRIP) for improving the formability of the stainless steel.
Abstract:
The invention relates to foundry engineering, more specifically to producing an antifriction layer of a plain bearing by casting babbitt into a bearing shell or backing and is applicable to the manufacture and renewal of plain bearings.The invention is aimed at improving the quality of a plain bearing antifriction layer.A method for producing an antifriction layer of a plain bearing including: casting babbitt into a bearing shell or backing and forcedly cooling the babbitt at a speed providing structural uniformity of the antifriction layer, mainly by cooling babbitt on the cast-in layer side, characterized in that said casting of babbitt into a bearing shell or backing produces a semifinished antifriction layer which is subjected to plastic deformation by means of a punch under superplasticity conditions to produce an antifriction layer, the bearing shell or backing being used as a die.
Abstract:
The invention relates to plastic metal working, more specifically to methods for producing parts of the disk- or shell-type having conical, hemispherical, and also combined parts, such as disk-and-shaft ones. The invention is instrumental in producing large axially symmetric parts from hard-to-work multiphase alloys. The method consists in that the billet is heated in a temperature range above 0.4 m.p. but below the temperature at which a total content of precipitates or an allotropic modification of the matrix of a multiphase alloy is not below 7%. Then the preheated billet is rolled, while controlling its temperature and the tool load, as well as the rolling speed. Once rolled the billet is heat-treated at a temperature depending on the microstructure of the billet material resulting from rolling. Prerolling preparing of a specified microstructure of the billet material is also described.
Abstract:
The invention relates to a method for producing magnesium alloys with a superplastic structure using a deformation process, followed by quick cooling. The magnesium-based alloy is initially pre-heated to a temperature of 340-380null C. and is subsequently deformed. The semi-finished product thus obtained is cooled down at high speed to an ambient temperature immediately after deformation.
Abstract:
Procédé de fabrication d'un alliage à base de titane à propriétés super élastique et/ou à mémoire de forme pour appl ication biomédicale, comportant les phases de: préparation d'un lingot par fusion sous vide des différents métaux constitutifs de l'alliage souhaité; optionnellement homogénéisation sous vide du lingot par recuit à haute température (supérieure à 900°C); première trempe; mise en forme mécanique (laminage, tréfilage, usinage, ou équivalent); traitement thermique de remise en solution en phase beta au delà de la température du transus beta (jusqu'à une seconde température puis maintien à celle-ci pour une certaine durée); seconde trempe; caractérisé en ce que ladite phase de traitement thermique est réalisée sous atmosphère gazeuse, et constitue également un traitement de surface apte à former en surface, une couche de nitrure, carbonitrure, oxyde, oxynitrure, ou équivalent.
Abstract:
L'invention concerne un alliage de titane monolithique (M) comprenant, dans un domaine de température (ΔΤ) et à pression atmosphérique : - une zone périphérique externe constituée d'une microstructure (m 1 ) ayant un module d'élasticité (E 1 ) et possédant des propriétés superélastiques dans ledit domaine (ΔΤ), et - un cœur constitué d'une microstructure (m 2 ) ayant un module d'élasticité (E 2 ), et possédant des propriétés élastiques dans ledit domaine (ΔΤ); lesdites micro structures (m 1 ) et (m 2 ) étant distinctes l'une de l'autre, et ledit module d'élasticité (E 1 ) étant inférieur audit module d'élasticité (E 2 ).