Method for balling PEEK ultrafine powder

Abstract

The invention discloses a method for balling PEEK ultrafine powder, belonging to the technical field of powder balling. The method adopts a high-temperature fluidized bed to carry out balling treatment on the PEEK ultrafine powder, and concretely comprises the steps of feeding PEEK powder into a fluidized layer from a feeding hole of the fluidized bed, enabling gas to flow into the fluidized layer from a gas inlet in the top of the fluidized bed, and heating the gas in the upper part of the fluidized layer by a heating device to form high-temperature gas stream, wherein the temperature of the high-temperature gas stream is controlled to be higher than the melting point of the powder; melting the surface of the PEEK powder under the action of the high-temperature gas stream, forming spheres with part agglomeration under the surface tension of the powder in the collision process; and enabling the spheres to descend to a low-temperature area at the lower part of the fluidized bed under the action of the gravity of the spheres, and discharging from a discharge hole to implement the balling of the PEEK powder. The PEEK ultrafine powder provided by the method is high in degree of sphericity, regular in shape and high in fluidity and is especially suitable for an SLS technology in a 3D printing technology.

Description

technical field [0001] The invention relates to a technology of spheroidizing PEEK ultrafine powder through a fluidized bed, and the spheroidizing powder is especially suitable for selective laser sintering technology (SLS). Background technique [0002] Selective laser sintering technology is a kind of additive manufacturing technology. The processing process is to selectively melt the uniformly spread powder layer by laser heating to obtain the interface of the part, and sinter with the interface formed on the previous layer. , the process of superimposing layer by layer to obtain a complete part. This technology can be used in a variety of materials, and has the characteristics of high precision, simple process, high material utilization rate and short production cycle. In order to meet the requirements of production accuracy, the material powder used in this technology must meet the characteristics of uniform particle size distribution, high sphericity, and good fluidit...

AI Technical Summary

Problems solved by technology

At present, PEEK materials are usually processed by traditional thermoplastic processing technology through high-temperature melt extrusion or injection molding, and it is difficult to process complex structures and some special structures.

Selective laser sintering (SLS) technology can solve the processing and molding problems of PEEK complex structural parts, but it is currently known that only German EOS company in the world can process PEEK through SLS3D printing technology

The main reason is that the conventional production process of PEEK ultrafine powder is usually carried out by ball milling, air milling and other mechanical crushing methods. The powder particles usually have poor regularity, low sphericity, and relatively uneven particle size distribution, which makes it difficult to meet SLS requirements. The need for printing technology

Images