【Chief members】

Xuanhui Qu   Professor at the University of Science and Technology Beijing

Lin Zhang     Professor at the University of Science and Technology Beijing

Shubin Ren    Associate Professor at the University of Science and Technology Beijing

【Research Background】

Powder material technology allows the free design of a material composition and structure for the precise control of the material properties and to achieve near-net-shape manufacturing. It is one of the most important development directions of special high-performance materials and green manufacturing technologies, reflecting an integration of the material design and material preparation as well as that of the material synthesis and product processing and utilization. The development of novel high-throughput preparation technologies based on the principle of powder synthesis and sintering is an important aspect of materials genome engineering.

【Research Objectives】

Focusing on the demand for the development of special high-performance materials, the project team aims to conduct research on powder synthesis preparation technology based on multi-channel spray combustion, pressure infiltration technology, and powder-bed based 3D printing technologies for graded materials, from which high-throughput preparation prototypes with independent intellectual property rights can be constructed. On this basis, the team will further develop special high-performance powder materials and advanced near-net-shape manufacturing technologies, providing new materials and products for national defense and civilian high-technology sectors.

【Main Research Areas】

1. Development of the principle and technologies for high-throughput power material preparation.

2. Development of the principle and method for spray combustion synthesis.

3. Clarification of the interface wetting and reaction of composite materials.

4. Development of the principle and technologies for graded layering of multi-component powders.

【Significant Research Progress】

1. High-throughput preparation system for powder materials based on selective laser melting

 By selective laser melting, our team achieved a continuous change in the material composition in the horizontal direction through the design of a powder layering mechanism, which realizes the additive manufacturing of graded alloys. The results provide a new method for the high-throughput preparation of alloys with different compositions.

         Principle of graded powder layering         Graded alloy preparation system     Titanium-niobium graded alloy sample

2. High-performance powder material and near-net-shape manufacturing

 Utilizing high-throughput powder material preparation technology, our team improved the composition and process design of powder-metallurgy reinforced copper matrix composite brake pads, which have been successfully installed on the electric multiple units of “Fuxing” in China. This achievement resulted in the “Outstanding Innovation Product Award” at the 2018 World Congress on Powder Metallurgy (World PM 2018).

The brake pads on the “Fuxing” electric multiple unit of China, which won the “Outstanding Innovation Product Award” in World PM 2018.

In addition, based on the rheological forming theory of powder materials, the team established powder injection molding technology for materials such as metallic tungsten and aluminum nitride, which are usually difficult to process. The aluminum nitride frame with a high thermal conductivity and the tungsten electrode developed on this basis were successfully applied to key model projects of China, thereby solving the “bottleneck” problems. The relevant achievements were respectively awarded first prize for innovation in the 2017 China Nonferrous Metals Industry Science and Technology Award, and first prize in the 2018 Ministry of Education Technological Invention Award.