摘要:
The invention relates to a method for producing ceramic circuit boards from ceramic substrates having metal-filled vias. In order to be able to fill the vias by means of a single filling process, either a planar copper metallization is applied on one side to the ceramic substrate having vias by means of screen printing, or a copper film of 100 - 300 μm is bonded on one side to the ceramic substrate having vias in a DCB/DBC process and the vias are filled from the ceramic side by means of an electrogalvanic process in a copper bath by the deposition of copper.
摘要:
The invention relates to a process for producing ceramic balls (2). For the finished balls not to have any pores and cracks in the interior and for the process to make short process times possible, it is proposed that a round rod (1) having a homogeneous materials distribution be produced by cold or hot extrusion of a ceramic feedstock (mixture of inorganic ceramic powder and organic components) and balls (2) be moulded from the round rod (1) with retention of the homogeneous materials distribution at a temperature of the material of 10-200°C and the balls subsequently be sintered.
摘要:
The invention relates to a device for testing a ceramic socket insert (3) for hip joint implants having a receiving device (5), a pressure piece (6) and optionally having a plunger (7), wherein the receiving device (5) has a recess (9) with a positioning region (10) for receiving the socket insert (3) and the recess (9) has a receiving cone (11) in the positioning region (10). According to the invention, in order for the device to be universally applicable to all socket inserts (monolithic, modular, pre-joined) and therefore replace all current devices, an annular ductile adapter piece (8) having a conical outer surface contacting the receiving cone (11) and an inner surface contacting the socket insert is arranged in the positioning region (10) between the receiving device (5) and the socket insert (3), wherein the friction between the receiving device (5) and adapter piece (8) is lower than between the adapter piece (8) and socket insert (3).
摘要:
The invention relates to a process for producing a ceramic circuit board with electrical conductor traces and contacting points on at least one of the two sides, and with at least one through-hole contact (via). According to the invention, the following successive process steps are performed: a) Production of a ceramic substrate made of aluminium nitride and drilling of holes at the intended locations for the vias, b) Filling the holes with a first adhesive paste made of copper, tungsten, molybdenum or alloys thereof, or mixtures thereof, and c) Single-pass overprinting with a second adhesive paste using a first screen-printing operation on at least one side of the ceramic substrate with the desired layout of the conductor traces and contact points, d) Optionally, a full or partial repeat of overprinting with the second adhesive paste, e) Stoving the printed ceramic substrate in an oven with N 2 (nitrogen), wherein the oxygen content is kept controlled to 0-50 ppm O 2 , f) Overprinting using a second screen-printing process with a low-glass cover paste over the second adhesive paste until the desired thickness of the conductor traces and contact points is achieved, g) Stoving the printed ceramic substrate in an oven with N 2 (nitrogen), wherein the oxygen content is kept controlled to 0-50 ppm O 2 .
摘要:
Die Erfindung betrifft einen Trägerkörper (1, 2) für elektrische oder elektronische Bauelemente (6a, 6b, 6c, 6d) oder Schaltungen, wobei der Trägerkörper (1, 2) elektrisch nicht oder nahezu nicht leitend ist und der Trägerkörper (1, 2) einstückig mit Wärme ab- oder zuführenden Kühlelementen (7) versehen ist. Zur Vereinfachung des Trägerkörpers (1) bei gleichzeitiger extrem verbesserter Wärmeableitung wird erfindungsgemäß vorgeschlagen, dass der Trägerkörper (1, 2) eine Platine ist, der Trägerkörper (1, 2) und das Kühlelement (7) aus einer Keramik oder aus einem Kompositmaterial besteht und das Kompositmaterial elektrisch nicht oder nahezu nicht leitende Matrixmaterialien mit Wärme leitenden Zuschlagstoffen enthält und auf der Oberfläche des Trägerkörpers (1, 2) versinterte Metallisierungsbereiche (41) aufgebracht sind.
摘要:
The invention relates to a cutting plate (4) for a chip-removing cutting tool, comprising a cutting plate top face (9) and a cutting plate bottom face (10), one or more lateral faces (13), cutting edges (6) at the transition between the cutting plate top face (9) and the one or more lateral face (6), and a circular chip recess (1) in the cutting plate top face (9) that has an outside diameter d1. In order to reduce the production costs, according to the invention the following applies to the outside diameter d1 of the chip recess (1): 2 mm