| 摘要 |
<p>The production of hard metal mixture or cermet mixture for the powder metallurgy processing to hard metal pieces and cermet pieces and for thermal coatings, comprises preparing the powdered mixture components in grit size suitable for the mixture, homogenizing all mixture ingredients including dispersion liquid without freely movable grinding body in a dispersion device (1) working according to the rotor-stator principle and removing the dispersion liquid from the homogenized suspension. The suspension is produced from the mixture components and the dispersion liquid before homogenizing. The production of hard metal mixture or cermet mixture for the powder metallurgy processing to hard metal pieces and cermet pieces and for thermal coatings, comprises preparing the powdered mixture components in grit size suitable for the mixture, homogenizing all mixture ingredients including dispersion liquid without freely movable grinding body in a dispersion device (1) working according to the rotor-stator principle and removing the dispersion liquid from the homogenized suspension. The suspension is produced from the mixture components and the dispersion liquid before homogenizing. The dispersion device brings shearing forces through tool part surfaces moving itself relatively counter-rotating to each other into an operating volume present between these surfaces. The suspension is supplied to a dispersion device. The suspension passes through several times to the dispersion device with a fixed number of throughputs in batch wise manner. The suspension is detained at a separation by dispersing additives. The dispersion liquid is removed by spray-drying or in the eddy current. The suspension presents itself in a gap volume during the homogenizing step, which forms the operating volume between rotor and stator. The peripheral speed of the rotor is 15-40 m/min during homogenizing of the suspension. The duration of the homogenization is 20-40 min. Un-sintered hard metal-reflux material is supplied to the mixture components in prepared form before pre-grinding. The mixture is directly supplied to the further processing like secondary plasticization, shaping, sintering and/or pruning after removing the dispersion liquid. An independent claim is included for a device for the production of hard metal mixture or cermet mixture.</p> |
