Binder Spray Metal Powder Materials For 3D Printing

In general, metal 3D printing technology based on powder forming often requires high material and physical and chemical properties of metal powder, which is the basic unit of its construction. Take the 3D printing technology of selective laser melting as an example: on the one hand, it is difficult to form high reflective and non weldable alloy materials due to the use of laser melting metal; On the other hand, the powder cylinder feeding technology has a high requirement on the fluidity of metal powder, which is generally used with a relatively thick particle size range of 15-53 μ m) The spherical metal particles of are printed as forming materials. The preparation process of spherical metal powder further increases the cost of raw materials. Binder spraying metal 3D printing technology has changed the above situation: the types of printing materials are not limited, the particle size of printing powder is finer, and the requirements for the sphericity of printing materials are lower.

1. Range of printable materials

Share the latest self-developed AJM series adhesive spraying metal 3D printing system of intelligent equipment, and achieve part forming by bonding metal powder with organic adhesive at room temperature. Therefore, the raw materials applicable to the printing of this series of equipment are very extensive, which are not only suitable for all kinds of iron base alloys, titanium base alloys, nickel base alloys, but also for refractory or highly reflective metal powders such as tungsten and copper. In addition, through experimental verification, this series of equipment also shows the forming advantages of various oxide ceramics, carbide ceramics, graphite and other materials.

2. Physical and chemical properties of metal powder

AJM series 3D printing equipment independently developed by sharing intelligent equipment solves the problem of uneven powder spreading of ultra-fine metal powder by adopting ultrasonic powder feeding and multiple roller compaction, and reduces the lower limit of particle size of printable materials from 15 μ M extended to 2 μ m. Ensure that the printed product structure is more refined, the performance and surface quality are higher, and the upper limit is 53 μ M expands to 100 μ m。 At the same time, the equipment has low requirements for the flow of metal powder. Even the non spherical powder with poor fluidity (the repose angle is 25-45 °) can be printed and formed by replacing the lower powder screen and adjusting the printing parameters.

(SLM)

(Non spherical powder (AJM))

Spherical metal powder is usually obtained by atomization, rotating electrode or spheroidization, and the preparation cost is high. Non spherical metal powder can save this step and reduce the cost of raw material preparation. Taking tungsten powder as an example, the price of spherical tungsten powder is about 1000 yuan/kg, while the price of non spherical tungsten powder is only 400 yuan/kg. By comparison, AJM series binder jet 3D printing system can save 3/5 of the cost of powder raw materials when printing with non spherical tungsten powder.

Metal binder spraying metal 3D printing technology has become a strong trend in the world, and the quality, efficiency and cost have been greatly optimized. Sharing the industrial binder spraying metal 3D printing system for large-scale production independently developed by intelligent equipment will show strong vitality in the production of batch metal parts in the future.