High-grade millimeter-level coarse particle diamond square crystal synthesis process

• Main Authors: LIU KAOSHAN, JIANG KELI, CHEN ZHAOZHEN, SU HAO, LU YINJIE
• Format: Patent
• Language: Chinese; English
• Published: 04.06.2024
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING

The invention belongs to the technical field of diamond synthesis, and provides a high-grade millimeter-level coarse particle diamond square crystal synthesis process which comprises the following steps: preparing a powder catalyst and spherical graphite with the particle size of-300 meshes; premixing the preparation raw materials and then granulating; putting the granulated mixture into a mold, pressing into a core column by adopting a four-column press, putting the core column into a vacuum furnace, carrying out vacuum thermal reduction treatment, cooling, discharging from the furnace, completing vacuum packaging, carrying out high-temperature and high-pressure press-synthesis on the core column by adopting a cubic press, crushing a synthesized graphite rod, soaking the graphite rod in mixed acid, heating in aqua regia, and carrying out high-temperature high-pressure press-synthesis; after the diamond is boiled in water and fried to be dry, particle size screening is carried out, coarse-grained pure square