Abstract:
A process for depositing a noble metal on zirconia ceramics is described, which comprises the steps of: inserting an element made of zirconia ceramics and at least one noble metal into a machine for creating vacuum; performing a vacuum operation at a temperature of about 200 °C, through a Physical Vapour Deposition, PVD, technology, thereby ionizing the noble metal into atoms, which melt with the sub-layer of zirconia ceramics, obtaining a surface with high resistance and hardness. A jewellery product made through such process is also described.
Abstract:
A method of manufacture of products from geopolymer composite shaped in a mold which is filled by casting of geopolymer composite in form of a precursor and after its hardening the casting is taken out from the mold and the casting surface is provided with a metallic layer. Before metal-plating casting surface with absorption capacity greater than 5 % is treated to make it chemically stable so that pH of a leachate from 100 g of the bulk product in 1000 g distilled water after 24 hours does not exceed 9. In order to reduce the absorption capacity of the casting surface it is penetrated with polymer substances or particles of a non-porous filler are added into the geopolymer composite in the precursor state. The metallic layer on the casting surface is made by a method from the group of methods that include vacuum deposition, vacuum sputtering, galvanization, cold metal spraying, dip coating in melted metal, plasma spraying of melted metal, deposition of metal from metal salt solution or colloid solution or sintering of powder metal.
Abstract:
An method of forming a metal foil coated ceramic and a metal foil capacitor is provided in a method of making a metal foil coated ceramic comprising providing a metal foil; applying a ceramic precursor to the metal foil wherein the ceramic precursor comprises at least one susceptor and a high dielectric constant oxide and an organic binder, and sintering the ceramic precursor with a high intensity, high pulse frequency light energy to form the metal foil ceramic.
Abstract:
The present invention is a technological sequence which is composed of uniaxial freezing with control solution composition, followed by freeze-drying, followed by sintering, and followed by infiltration. The invention enables the manufacturing of functionally graded composites. These composites can include spatially distributed phases of ceramics, metals, polymers, glasses, and their combinations as long as the composite matrix material is originally in the form of powders. During uniaxial freezing, the diameter of crystals growing from the suspension (and, thus, the diameter of the voids formed after freeze-drying) is dependent on the controllable rate of cooling, pressure and the changeable chemical composition of the suspension liquid phase. Thereby a structure with conic voids can be created. After following sintering and infiltration, the produced composite (e.g., ceramic-metal composite) will have a specially distributed concentration of the second phase in the composite matrix, that is, it will have a functionally-graded structure.
Abstract:
Wearing element (1) with enhanced wear resistance related to wearing elements, such as cast steel teeth to be specially used in machinery for earth-moving, ground- engaging and/or rock-loading applications, as well as to inserts to be included within the wearing elements, to enhance their wear resistance thus prolonging their service life.