Binder Jetting (BJ) in additive manufacturing technology means that the binder selection is deposited on the powder bed by spraying layer by layer through the inkjet print head, and the preliminary blank of 3D solid parts is bonded to print, and then the printed preliminary blank is placed in a uniform thermal environment for defatting and sintering, so that it is densified and the parts with good mechanical properties are obtained. As a high-efficiency and low-cost 3D printing technology, binder injection has been paid attention to in recent years, especially in automotive and other industrial fields.

The traditional production of silicon carbide ceramics mainly adopts hot pressing sintering, non-pressing sintering, hot isostatic pressing sintering, its structure geometry complexity is seriously limited; The dark powder will not be UV curing, laser selection melting processing method can not print processing high melting point and high hardness of SiC, theoretically can ensure the printing speed at the same time, taking into account the product dimensional accuracy of only binder 3D printing.

As the largest application center of Desktop Metal in China, DEW focuses on the development of new materials, new process development and production and processing services of binder jet 3D printing technology, and provides customers with comprehensive solutions for mass production of 3D printing complete sets of equipment. Cemented carbide, special ceramics and other materials using binder jet 3D printing has provided a lot of services for well-known enterprises at home and abroad, and also helps customers solve practical problems in complex products such as complex flow channels, lightweight structures, rapid prototyping, and small batch production.

Binder 3D printing technology currently has several core elements, the first binder is the key to print quality, in the spray stage, the binder on the stability of different powder materials bond and later sintering process shrinkage deformation has played a crucial role. It can be said that the chemical technology of binder is the key core of binder jet 3D printing technology. At present, Delwyman has begun to develop binder for special materials;

Secondly, the nozzle is mainly based on piezoelectric nozzle, piezoelectric nozzle tens of thousands of holes can greatly improve the printing speed, because it is the characteristics of multi-nozzle spray binder, relative to the current market popular single laser and multi-laser laser powder bed technology, its printing speed is tens of times, or even hundreds of times, the efficiency is greatly improved;

Another big advantage of binder 3D printing technology is the wide range of materials used. Due to the way bonding is used, there is no need for heating when printing, and temperature changes are only involved when the binder is removed by later sintering (similar to thermal stripping). In theory, the technology is suitable for printing most materials, such as metals, ceramics, ceramic metal matrix composites, cemented carbide, etc.

As powder metallurgy or 3D printing related personnel, may think that the sintering process is the most troublesome, of course, the sintering process is one of the keys to ensure quality, the process to effectively remove the binder, while ensuring that the shape does not change, which is closely related to the material sintering and heat treatment process, Deyi Wei has accumulated rich engineering experience in the exploration process of its own sintering process. In addition, the equipment currently comes with AI algorithm sintering simulation software, which can effectively control the related problems of sintering deformation;

Binder injection technology has no temperature change in the printing process, the internal stress of the material is small, and can rely on the powder to achieve self-support, without the need for additional support design, to achieve 100% utilization of the material and multiple printing at a time, which is one of the core of different from other additive manufacturing methods. At the same time, after the powder is printed once, there is no powder bonding caused by temperature change, no need to clean and screen, and it can be directly recycled, which is also one of the cores different from other additive manufacturing methods.

Binder 3D printing equipment has low environmental requirements. Binder spray technology has no temperature change and chemical change in the printing process, and the metal powder will not be oxidized because of high temperature, so the ordinary printing environment can continue to print, which greatly reduces the operating requirements of the equipment and process.

In summary, DEW relies on its independent capabilities in new materials, functional structure, research and development simulation, adhesive adaptation and other technologies, and constantly improve product functions, develop new application products, gradually expand the scale of customers, expand the application field of binder jet 3D printing technology, sales scale continues to grow rapidly.