Wuhan University of Technology's scientific achievement: Key technology for low-pressure discharge plasma sintering preparation of ultra-hard diamond composite materials

Release date:

2025-06-18

Both domestically and internationally, efforts to address the sintering challenges of polycrystalline diamond primarily focus on two approaches: adding sintering aids and employing liquid-phase sintering. Commonly used sintering aids include Co, Ni, B, Si, and Ti, which can help moderately reduce sintering pressure. However, even with these advanced techniques, current manufacturing methods still require ultra-high pressures exceeding 5 GPa for diamond sintering. As such, there remains significant room for improvement in achieving ultra-high-pressure diamond synthesis. Meanwhile, diamond synthesis processes that operate at pressures below 0.5 GPa have become a key research focus in both scientific and industrial communities. This innovative 100 MPa-level technology holds immense potential for practical applications and could pave the way for substantial commercial advancements.

Ultra-hard Diamond Composite material's

Key Technologies for Low-Pressure Preparation via Discharge Plasma Sintering

Keywords: Ultra-hard diamond composite material - Discharge plasma sintering, powder chemical vapor deposition

1. Technical Field:

Ultra-hard materials

2. Application industries:

Cutting Cutting tools New materials to come

3, Summary of Achievements:

Diamond is the hardest naturally occurring material, widely used in cutting tools, oil extraction, and precision manufacturing. However, natural diamonds are extremely expensive due to their limited size and availability, making the production of polycrystalline diamond an urgent and highly sought-after industrial need. This research presents a novel approach—using discharge plasma sintering—to create ultra-hard diamond composite materials. By modifying the surface of diamond powder with silicon carbide, the technique effectively prevents diamond degradation during the high-temperature sintering process. Graphite Phase transformation achieved. This breakthrough features low sintering pressure—only 2% of the conventional pressure (above 5 GPa) typically used for diamond production, set at 100 MPa. The resulting diamond composite material exhibits high density and exceptional hardness. Notably, the Vickers hardness of the ultra-hard diamond composite can reach up to 36 GPa.

4. Market Outlook:

To address the sintering challenges of polycrystalline diamond, both domestic and international research has primarily focused on two approaches: adding sintering aids and employing liquid-phase sintering techniques. Commonly used sintering aids include Co, Ni, B, Si, and Ti, which can effectively reduce the required sintering pressure. However, even with these advanced methods, current preparation technologies still demand ultra-high pressures exceeding 5 GPa for diamond sintering. As such, there remains significant room for improvement in achieving ultra-high-pressure diamond synthesis. Meanwhile, diamond synthesis processes conducted at pressures below 0.5 GPa have become a key area of intense research interest—both in scientific circles and within industry. This innovative 100 MPa-based technology holds immense potential for practical applications and could unlock substantial opportunities for widespread adoption in the near future.

5. Application Scenarios:

Cutting tools, oil extraction, precision machining, and more

Core patent technology:

A delegation from Zhengzhou Huajing Diamond Co., Ltd. visited Danyang for inspection and exchange discussions.

Diamonds see another significant breakthrough.

A delegation from Zhengzhou Huajing Diamond Co., Ltd. visited Danyang for inspection and exchange discussions.

Diamonds see another significant breakthrough.

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