Preparation method of micron polycrystalline cubic boron nitride grinding material

A cubic boron nitride and abrasive technology, which is applied in the field of preparation of micron polycrystalline cubic boron nitride abrasives, can solve the problems of decreased fracture toughness and no improvement in hardness, so as to achieve full utilization, reduce production costs, and reduce inventory.

Pending Publication Date: 2019-11-26
ZHENGZHOU ZHONGNAN JETE SUPERABRASIVES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a tool material, the use temperature has been significantly increased, and turning without coolant can be realized, but the hardness has not improved, and the fracture toughness has decreased significantly.

Method used

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  • Preparation method of micron polycrystalline cubic boron nitride grinding material
  • Preparation method of micron polycrystalline cubic boron nitride grinding material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this embodiment, the cBN micropowder with a particle size of 0-1 μm is used as a raw material, and the mass 30% of the cBN micropowder is added with B n h n+6 , to obtain the sample to be processed; put the obtained sample to be processed into a three-dimensional mixer and mix for 30 hours; after the mixture is taken out, it is pressed and formed on a hydraulic press to obtain the column required for synthesis; the compressed column is placed in the Treat in a high-temperature vacuum furnace at 1600°C for 3 hours; after cooling down, pass nitrogen gas into the micropores in the column, take it out after 1 hour, and carry out vacuum packaging for standby; put the column under the condition of 6GPa and 1500°C The synthesis is carried out for 5 minutes to obtain a sintered body; the sintered body is crushed, ball milled and sieved to obtain a micron polycrystalline cBN abrasive.

Embodiment 2

[0028] In this embodiment, cBN micropowder with a particle size of 1-2 μm is used as a raw material, and a boron source (a mixture of crystalline boron and amorphous boron) with a mass of 5% of the cBN micropowder is added to obtain a sample to be treated; the resulting sample to be treated is placed in Mix in a three-dimensional mixer for 20 hours; after taking out the mixture, press it on a hydraulic press to obtain the column required for synthesis; process the pressed column in a high-temperature vacuum furnace at 1200°C for 2 hours; after cooling , nitrogen gas is introduced to make the nitrogen gas enter the micropores in the column, take it out after 1 hour, and carry out vacuum packaging for standby; the column is synthesized under the conditions of 10GPa and 2000°C for 15 minutes to obtain a sintered body; the sintered body is crushed Finally, the micron polycrystalline cBN abrasive is obtained after ball milling and sieving.

Embodiment 3

[0030] In this embodiment, cBN micropowder with a particle size of 0-1 μm is taken as a raw material, and amorphous boron with a mass of 20% of the cBN micropowder is added to obtain a sample to be treated; the obtained sample to be treated is put into a three-dimensional mixer and mixed for 10 hours; After the mixture is taken out, it is pressed and formed on a hydraulic press to obtain the column required for synthesis; the pressed column is treated in a high-temperature vacuum furnace at 1200°C for 1 hour; after cooling down, nitrogen gas is introduced to allow nitrogen to enter the column In the micropores in the body, take it out after 2 hours, and carry out vacuum packaging for standby; synthesize the cylinder at 7.7GPa and 1800°C for 15 minutes to obtain a sintered body; crush the sintered body, then ball mill and sieve it A micron polycrystalline cBN abrasive is obtained.

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Abstract

The invention discloses a preparation method of a micron polycrystalline cubic boron nitride grinding material. The preparation method aims to solve the problems existing in an existing method for synthesizing cBN. The preparation method specifically comprises the following steps of 1, adding a boron source with the weight 1% - 30% of the weight of cBN micro powder into the cBN micro powder to obtain a first mixture; 2, mixing the first mixture for 8 - 30 h, taking out the first mixture and pressing and forming the first mixture to obtain a column body; 3, treating the column body at high temperature for 0.5 - 3 h, cooling the column body and introducing nitrogen, and taking out the column body after 1 - 2 h to obtain the treated column body; 4, synthesizing the column body under a high-temperature and high-pressure condition for 1 - 15 min to obtain a sintered body; and 5, crushing, ball-milling and screening the sintered body to obtain a finished product. According to the preparationmethod of the micron polycrystalline cubic boron nitride grinding material, the micron polycrystalline cBN grinding material can be obtained under a mild condition, the synthesis condition is reduced, and a large amount of inventory generated in the formation and production of the cBN micro powder can be reduced, so that raw materials are fully utilized, the production cost is reduced, and the application prospect is wide.

Description

technical field [0001] The invention relates to the field of superhard material synthesis, in particular to a preparation method of micron polycrystalline cubic boron nitride abrasive. Background technique [0002] Among the superhard materials that have been applied industrially, the hardness of cubic boron nitride (cBN) is second only to diamond, but its thermochemical stability is better than that of diamond. Therefore, cBN is widely used in processing various metals such as alloy steel, cast iron, die steel, high-speed steel and titanium alloy, which are difficult to process with diamond tools, and its application in equipment manufacturing, precision machinery, ultra-precision machining and other fields is increasing, and play an irreplaceable role. [0003] At present, cBN single crystal is mainly used to manufacture grinding tools such as grinding wheels. It has a cleavage plane and anisotropy. It is easy to wear and break along the cleavage plane during use, causing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B24D18/00C09K3/14C30B1/10C30B29/40
CPCB24D18/0009C09K3/1454C30B29/40C30B1/10
Inventor 张相法王永凯位星张嘉琛王大鹏刘红伟薛磊贾帅中
Owner ZHENGZHOU ZHONGNAN JETE SUPERABRASIVES
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