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A high-performance polycrystalline diamond sintered body

A polycrystalline diamond and sintered body technology, applied in the field of superhard tool materials, can solve the problems of wear ratio, reduced impact toughness, little change, etc., to achieve uniform consistency improvement, enhanced wear resistance, and improved mixing effect. Effect

Active Publication Date: 2017-10-27
ZHONGNAN DIAMOND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, due to the limitation of formula and process, the polycrystalline diamond sintered body products have the following problems: 1) The wear ratio of the sintered body is 200,000 to 250,000 (about 300,000 in foreign countries); 2) The impact toughness is greater than or equal to 40 to 50 Joule (abroad is about 55 joules), 3) Thermal stability of sintered body: After domestic products are roasted at 800 ° C for 2 minutes, the product wear ratio and impact toughness decrease, which is related to the different formulas and processes adopted by each unit. The wear ratio of the sintered body does not change much before and after sintering

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A nano-metal bond for improving the performance of polycrystalline diamond sintered body, which is composed of the following raw materials in weight percentage: Co powder 96%, Ni powder 1%, Si powder 1%, Ti powder 0.5%, Ta powder 0.5% , Hf powder 0.5%, B powder 0.5%. The raw materials of the above-mentioned binders are preferably analytically pure, the particle size of Co powder and Ni powder is 25-35nm, the particle size of Si powder and Ti powder is 20-30nm, and the diameter of Ta powder, Hf powder and B powder is 40-50nm When the effect is better, it is more conducive to enhancing the wear resistance, heat resistance and impact toughness of polycrystalline diamond sintered body.

[0021] A high-performance polycrystalline diamond sintered body with high wear resistance, high impact resistance and good thermal stability, which is composed of the following raw materials in weight percentage: 85% of diamond powder with a particle size of 5-15 μm and the above Nano meta...

Embodiment 2

[0029]A nano-metal bond for improving the performance of a polycrystalline diamond sintered body, consisting of the following raw materials in percentage by weight: Co powder 98%, Ni powder 0.5%, Si powder 0.5%, Ti powder 0.2%, Ta powder 0.3% , Hf powder 0.25%, B powder 0.25%, among them, the particle size of Co powder and Ni powder is 25~35nm, the particle size of Si powder and Ti powder is 20~30nm, and the particle size of Ta powder, Hf powder and B powder is 40~30nm. 50nm.

[0030] A high-performance polycrystalline diamond sintered body with high wear resistance, high impact resistance and good thermal stability, which is composed of the following raw materials in weight percentage: 95% of diamond powder with a particle size of 5-15 μm and the above Nano metal binder 5%. Its preparation method comprises the following steps:

[0031] (1) Purification and reduction treatment: Boil diamond powder with 50% sodium hydroxide aqueous solution for 15 minutes, wash with deionized...

Embodiment 3

[0038] A nano-metal bond for improving the performance of a polycrystalline diamond sintered body, consisting of the following raw materials in weight percentage: 97% Co powder, 0.7% Ni powder, 0.8% Si powder, 0.3% Ti powder, 0.4% Ta powder , Hf powder 0.4%, and B powder 0.4%, among which, the particle size of Co powder and Ni powder is 25-35nm, the particle size of Si powder and Ti powder is 20-30nm, and the diameter of Ta powder, Hf powder and B powder is 40-30nm. 50nm.

[0039] A high-performance polycrystalline diamond sintered body with high wear resistance, high impact resistance and good thermal stability, which is composed of the following raw materials in weight percentage: 90% of diamond powder with a particle size of 5-15 μm and the above-mentioned Nano metal binder 10%. Its preparation method comprises the following steps:

[0040] (1) Purification and reduction treatment: Boil diamond powder with 48% sodium hydroxide aqueous solution for 18 minutes, wash with de...

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Abstract

The invention discloses a high-performance polycrystalline diamond sintered body with the characteristics of high wear resistance, high impact resistance and good thermal stability and a preparation method thereof, and simultaneously provides a nanometer metal bond used in the sintered body. Its nano-metal binder is composed of Co powder, Ni powder, Si powder, Ti powder, Ta powder, Hf powder and B powder according to a specific ratio. It has a good sintering promotion effect under high temperature and high pressure, and is helpful for sintering The bonding density between diamonds (D-D bonds) is conducive to the formation of a strong sintered body, which enhances the wear resistance, high heat resistance and high impact toughness of the sintered body, and prolongs the service life of the sintered body. Compared with the existing diamond sintered body, the prepared polycrystalline diamond sintered body: the wear ratio is increased from 200,000 to 250,000 to 350,000 to 400,000; the impact toughness is increased from 40 to 50 joules to 60 to 70 joules, and the thermal stability: in After roasting at 800°C for 5 minutes, the wear ratio of the product is 320,000 to 380,000, the impact toughness is 57 to 67 Joules, and the thermal stability is good.

Description

technical field [0001] The invention belongs to the field of superhard tool materials, and in particular relates to a high-performance polycrystalline diamond sintered body, its manufacturing method, and a nano-metal bond used. The sintered body can be used for cutting tools, shapers, wire drawing dies, and excavation drills, etc. aspect. Background technique [0002] Polycrystalline diamond sintered body is sintered by diamond powder and a binder composed of a certain proportion under high temperature and high pressure. Due to the excellent properties of diamond in terms of hardness, strength, wear resistance and thermal conductivity, many original difficult The objects that can be processed or cannot be processed can be processed with high quality and high efficiency after using diamond tools. Therefore, polycrystalline diamond sintered bodies have been widely used in industrial production, and are often used in sawing tools, cutting tools, wood processing tools, wire dra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00C22C1/05C22C26/00B01J3/06
Inventor 张涛卢灿华刘俊涛窦明
Owner ZHONGNAN DIAMOND CO LTD
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