| 摘要 |
A cemented carbide powder is produced by first introducing a slurry into a drop forming device. The slurry is ejected from the discharge opening of the device in a form of a jet to a directed surface and then to another directed surface. The slurry is then led further to an additional directed surface from where the drops are allowed to fall down forming the cemented carbide powder. A method of making cemented carbide powders with good abrasive wear resistance involves introducing a slurry into a drop forming apparatus including at least one horizontally oriented, rotating, drop forming disc, from which the drops are slung out to solidify. The slurry is ejected out from a discharge opening (21) of the apparatus in a form of a jet such that it hits a first obliquely downwards-inwards directed surface (22). The speed of rotation of the disc is chosen such that the jet of liquid is forced upwards over the first surface as well as over to another connected horizontal surface (23) by the centrifugal force. The slurry is then ejected as a divided jet towards a second obliquely downwards-outwards directed surface (25) such that the slurry is accelerated to the speed of the drop forming disc (12). The slurry is then led over a third surface (26) obliquely directed outwards, from where the drops are caused to fall down forming the cemented carbide powders. Independent claims are also included for (a) an apparatus for breaking down the melt into drops including a number of disc units which are rotatable around an axis and a mechanism for distributing the melt to the discs; and (b) powder consisting of an agglomerates of cemented carbide, cermets, ceramics or similar materials made from the above process. |
