Ceramic crucible

Abstract

The invention discloses a ceramic crucible, the top view of the crucible body (1) is round, the top part is equipped with upper mouth (1. 1), the crucible body (1) is made from ceramic materials containing oxides such as Alumina, Magnesia or Zirconia, the bottom part of the crucible body (1) is equipped with a bottom mouth (1. 2), the proportion between the diameter (d) of the bottom mouth (1. 2) of the crucible body (1) and the diameter (d) of the upper mouth (1. 1) of the crucible (1) is 1:5-15; the proportion between the height (L) from the bottom surface of the crucible body (1) to the top surface of the crucible body (1) and the diameter (D) of the upper mouth (1. 1) of the crucible body (1) is 5:1-5. The ceramic crucible not only fuses into the metal contained or forms alloy with the metal contained to influence the production quality of the nano metal powder, but also has good conductive character.

Description

technical field [0001] The invention relates to a ceramic crucible used in a plasma transfer arc heating device in the production process of nanometer metal powder and the like. Background technique [0002] In a device for producing nano-metal powder by physical vapor phase method, such as the production device for nano-metal powder disclosed in the invention patent No. ZL 02110837.4, a crucible is needed as a container to evaporate the metal liquid. The shape of the crucible in the prior art is the shape of a conventional liquid container: its top view shape is generally circular, and its top is an opening. Since the production device adopts the plasma transfer arc as the heating source, it is objectively required that the electrodes of the plasma gun, the plasma transfer arc, the metal liquid and the DC power supply must form an electrical circuit, otherwise, the production cannot be carried out normally. In order to solve the above problems, the prior art requires the c...

AI Technical Summary

Problems solved by technology

However, in the actual production process, the crucibles of the above three prior art have their own defects: at the high temperature of the boiling point of the metal, graphite is easily fused to many metal liquids, resulting in a short life of the graphite crucible, and at the same time, it has a negative impact on the product quality of the nano-metal powder. Serious negative impact; at high temperature, due to the easy formation of alloys between the metal crucible and the contained metal, the normal production is affected. Therefore, the metal crucible needs to be cooled with water to cool the outer wall of the crucible, so that the heat loss of the crucible increases, and the metal liquid level It is not easy to reach the boiling point temperature, resulting in increased energy consumption, and a cooler area is formed inside the evaporation cavity, which has a negative impact on the particle size distribution of the metal particles and directly affects the product quality of the nano-metal powder; at the high temperature of the metal boiling point, carbonization Carbide ceramics are easily soluble in many metal liquids, resulting in a short life of the carbide ceramic crucible, and at the same time have a serious negative impact on the product quality of nano-metal powders

The use of oxide ceramic crucibles can avoid the negative effects of graphite crucibles, metal crucibles and carbide ceramic crucibles, and can overcome the defects of the above three crucibles. However, oxide ceramic crucibles are poor conductors and cannot be heated in plasma transfer arc. device used

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