In the early 1990s, China's diamond industry experienced significant growth. The hinged six-face press, a product of independent Chinese intellectual property, had reached a mature stage. High-pressure cylinders were expanding in scale, and the number of domestic presses was increasing. Materials such as iron, nickel, cobalt, and manganese were being used to create thin catalyst sheets, while graphite sheets remained stable. Pyrophyllite blocks, a key auxiliary material, were pressed into uniform shapes suitable for diamond single crystal production. Industry experts focused on improving quality, output, and cost efficiency.
At the time, diamond materials were considered strategic national resources, with production equipment and technology closely guarded internationally. While China developed its six-face press, Western countries used two-face presses, which offered higher tonnage, advanced materials, and more stable performance. These presses produced high-quality diamonds, which commanded premium prices in the international market. However, China’s six-face press had lower tonnage and a more complex pressure system, leading to medium-to-low-grade diamonds. Disparities in compressive strength, crystal shape, transparency, color, particle size, and impurities were evident compared to Western products.
To meet the demand for medium-to-high-grade diamonds in tools like stone-cutting saw blades, China had to import expensive foreign presses, often at great cost. Despite efforts to introduce two-face presses, challenges in integration and cost-effectiveness limited their success. Improving domestic diamond quality became a key goal for industry leaders.
Four main factors determine diamond quality: equipment, materials, cavity structure, and sintering process. Enhancing equipment, increasing hydraulic cylinder size, expanding cavities, and optimizing processes were essential steps. The six-face press, however, posed unique challenges due to its multi-pressure source design, requiring stronger materials and precise manufacturing. Despite these difficulties, progress was made over time.
In 1994, Beijing Jingxinlei Non-Metallic Materials Co., Ltd. aimed to produce "saw-chip" synthetic diamonds using powdered catalysts and graphite. Challenges included selecting appropriate materials, developing mixing methods, and designing compatible cavity structures. After extensive experimentation, they determined an Fe-Ni-Mn alloy as a suitable catalyst and high-purity natural flake graphite as the base material. A specialized synthesis column was developed for the four-column press.
Creating a proper environment for crystal growth required careful cavity design. The team improved steel caps, added dolomite casings, and developed internal structures that supported uniform temperature and pressure. Production of "black" (graphite) and "white" (cavity components) parts became central to the process. Through repeated trials, they refined mixing techniques, pressing methods, and synthesis procedures, eventually achieving consistent results.
By 1996, the experimental phase was complete, and the first batch of saw-chip diamonds was successfully produced. The crystals exhibited excellent form, low impurities, and high yield. This achievement marked a breakthrough in China’s superhard materials industry. In 1997, the technology was scaled up for industrial production, with support from various manufacturers.
Despite initial challenges in market adoption, the team addressed issues such as improper bonding of diamonds in cutter heads. Adjustments to the carbide formula resolved these problems, leading to successful applications in cutting tools. By 1998, further research led to the development of fine-grain high-grade diamonds, which met international quality standards.
Today, Beijing Jingxinlei continues to innovate, exploring new areas like large-scale composite films. With a strong focus on science and talent, the company remains committed to advancing China’s superhard materials industry and contributing to national development. The journey has been long, but the dream of a strong country through technological excellence remains alive.
Kitchen Cabinetry is the important staple in the modern house. It can fully come into the play that streamline and effectively save the valuable countertop space.
Modern Kitchen Cabinetry,Kitchen Layout,, Kitchen Remodeling, Stainless Steel Cabinet, Kitchen Cabinet Design,Sleek Kitchen Design,Custom Kitchen Cabinet, Contemporary Kitchen Design,Two-toned kitchen cabinet,minimalist kitchen cabinet,Kitchen Storage
Jiangmen MEIAO Kitchen And Bathroom Co., Ltd. , https://www.meiaosink.com