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Nano-diamond/cubic boron nitride block and preparation method therefor
The invention relates to a nano-diamond/cubic boron nitride block which is a superhard composite material block sintered by the following two raw materials in percentage by mass: 25-75% of nano round onion-carbon and 75-25% of cubic boron nitride, wherein the Vickers hardness of the block is 25-115 GPa and the breaking tenacity of the block is 4.6-7.8 MPa.M0.5. A preparation method for the nano-diamond/cubic boron nitride blockmainly comprises: mixing nano round onion-carbon powder with micron order cubic boron nitride powder in a ratio of (25-75): (75-25) (in percentage by mass), then filling the powder in a prefabricated die, and pressing the material under 60MPa by a common hydraulic machine at a normal temperature to obtain a blank block; filling the pressed blank block into a high pressure assembly, then putting the high pressure block between high pressure anvils so to be sintered at a high temperature under high pressure; then slowly cooling the block to the room temperature and removing the pressure; and obtaining the nano-diamond/cubic boron nitride superhard composite material which is compact in tissue and blocky in appearance. According to the block provided by the invention, diamond and cubic boron nitride are complementary in performance, so that the composite material block has the high hardness of diamond and inertia of cubic boron nitride on elements of iron group.
Nano-diamond/cubic boron nitride block and preparation method therefor
The invention relates to a nano-diamond/cubic boron nitride block which is a superhard composite material block sintered by the following two raw materials in percentage by mass: 25-75% of nano round onion-carbon and 75-25% of cubic boron nitride, wherein the Vickers hardness of the block is 25-115 GPa and the breaking tenacity of the block is 4.6-7.8 MPa.M0.5. A preparation method for the nano-diamond/cubic boron nitride blockmainly comprises: mixing nano round onion-carbon powder with micron order cubic boron nitride powder in a ratio of (25-75): (75-25) (in percentage by mass), then filling the powder in a prefabricated die, and pressing the material under 60MPa by a common hydraulic machine at a normal temperature to obtain a blank block; filling the pressed blank block into a high pressure assembly, then putting the high pressure block between high pressure anvils so to be sintered at a high temperature under high pressure; then slowly cooling the block to the room temperature and removing the pressure; and obtaining the nano-diamond/cubic boron nitride superhard composite material which is compact in tissue and blocky in appearance. According to the block provided by the invention, diamond and cubic boron nitride are complementary in performance, so that the composite material block has the high hardness of diamond and inertia of cubic boron nitride on elements of iron group.
Nano-diamond/cubic boron nitride block and preparation method therefor
ZOU QIN (author) / WANG MINGZHI (author) / TANG HU (author) / WANG XIAOLEI (author) / KE YUJIAO (author) / ZHAO YUCHENG (author)
2015-09-23
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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