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CBN (cubic boron nitride) polycrystalline sintered compact made by using nano-metal additives and method for manufacturing CBN polycrystalline sintered compact

A technology of nano metal and sintered body, applied in the field of CBN polycrystalline sintered body and its preparation, can solve the problems of poor quality, few types, weak overall strength, etc., and achieve the effect of prolonging the service life, increasing the toughness, and improving the sintering promotion effect.

Inactive Publication Date: 2015-10-07
ZHONGNAN DIAMOND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestic production and manufacturing of polycrystalline cubic boron nitride cutting tools has fewer types and poorer quality, and the overall strength is still weak
Due to the limitations of the formula and process of the domestic overall CBN tool products, there are problems: 1) the wear ratio is 3500-5000 (about 5000-8000 abroad); 2) the microhardness HV of the working layer is 2000-5000 (4000 abroad) ~7000); 3) The flexural strength is 300~600 MPa (about 500~1000 MPa in foreign countries); this is related to the different formulas and processes adopted by each unit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A CBN polycrystalline sintered body made of nano-metal additives, which is composed of the following raw materials in weight percentage: 60% of CBN powder (2-6μm) and 40% of nano-metal additives, the nano-metal additives It is composed of the following raw materials in weight percentage: analytically pure TiN powder (8-12nm) 45%, analytically pure TaC powder (8-12nm) 20%, analytically pure AlB 2 Co powder (8-12nm) 10%, analytically pure Co powder (22-36nm) 15% and analytically pure Al powder (22-36nm) 10%.

[0022] The preparation method of above-mentioned CBN polycrystalline sintered body, it comprises the steps:

[0023] 1) Purification and reduction treatment: Boil CBN powder with 35wt% sodium hydroxide aqueous solution for 7 minutes, wash with deionized water until neutral, boil with mixed acid (the volume ratio of concentrated sulfuric acid and concentrated nitric acid is 1:1) for 10 minutes, and use Wash with deionized water until neutral, then boil with aqua reg...

Embodiment 2

[0029]A CBN polycrystalline sintered body of nano-metal additives, consisting of the following raw materials in weight percentage: 93% of CBN powder (2-6μm) and 7% of nano-metal additives, the nano-metal additives are composed of the following Raw material composition by weight percentage: analytically pure TiN powder (8-12nm) 25%, analytically pure TaC powder (8-12nm) 25%, analytically pure AlB 2 Co powder (8-12nm) 15%, analytically pure Co powder (22-36nm) 20% and analytically pure Al powder (22-36nm) 15%.

[0030] The preparation method of above-mentioned CBN polycrystalline sintered body, it comprises the steps:

[0031] 1) Purification and reduction treatment: Boil CBN powder with 25% sodium hydroxide aqueous solution for 3 minutes, wash with deionized water until neutral, boil with mixed acid (the volume ratio of concentrated sulfuric acid and concentrated nitric acid is 1:1) for 5 minutes, and use Wash with deionized water until neutral, then boil with aqua regia (the ...

Embodiment 3

[0037] A nano-metal additive CBN polycrystalline sintered body, which is composed of the following raw materials in weight percentage: 85% of CBN powder (2-6μm) and 15% of nano-metal additive. The nano-metal additive consists of the following weight: Raw material composition by percentage: analytically pure TiN powder (8-12nm) 35%, analytically pure powder TaC (8-12nm) 22.5%, analytically pure AlB 2 Co powder (8-12nm) 12.5%, analytically pure Co powder (22-36nm) 17.5% and analytically pure Al powder (22-36nm) 12.5%.

[0038] The preparation method of above-mentioned CBN polycrystalline sintered body, it comprises the steps:

[0039] 1) Purification and reduction treatment: Boil CBN powder with 30wt% sodium hydroxide aqueous solution for 5 minutes, wash with deionized water until neutral, boil with mixed acid (the volume ratio of concentrated sulfuric acid and concentrated nitric acid is 1:1) for 7 minutes, and use Wash with deionized water until neutral, then boil with aqua r...

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Abstract

The invention discloses CBN (cubic boron nitride) polycrystalline sintered compact made by using nano-metal additives and a method for manufacturing the CBN polycrystalline sintered compact, and belongs to the technical field of cubic boron nitride tool materials. The nano-metal additives comprise, by weight, 25-45% of TiN powder, 20-25% of TaC powder, 10-15% of AlB<2> powder, 15-20% of Co powder and 10-15% of Al powder. Formulas of the CBN polycrystalline sintered compact made by using the nano-metal additives are reasonably arranged and selected by the aid of nano-technologies, and accordingly technical bottleneck in the aspects of high toughness and high abrasion resistance of existing CBN polycrystalline sintered compact can be broken through. Compared with the existing CBN polycrystalline sintered compact, the CBN polycrystalline sintered compact made by using the nano-metal additives and the method have the advantages that the abrasion ratio can be increased and is 6000-7000 from the original 3500-5000; the micro-hardness HV (Vickers hardness) of working layers can be increased and is 5000-7000 from the original 2000-5000, and the bending strength can be increased and is 750-850MPa from the original 300-600MPa.

Description

technical field [0001] The invention belongs to the field of cubic boron nitride cutting tool materials, and in particular relates to a CBN polycrystalline sintered body made of nano-metal additives and a preparation method thereof, which can be used as an integral CBN polycrystalline cutting tool and can be used for cast iron and hardened steel , heat-resistant steel alloys and other difficult-to-machine semi-finishing turning, finishing turning and milling. Background technique [0002] CBN polycrystalline sintered body is sintered by cubic boron nitride particles and a binder composed of a certain proportion under high temperature and high pressure. As one of the most important superhard materials, CBN tools have high hardness, wear resistance, Chemical stability, suitable for high-speed cutting, hard cutting, dry cutting and other mechanical processing requirements, has incomparable advantages in cutting cast iron, hardened steel, heat-resistant steel alloys, hard alloys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C29/16
Inventor 卢灿华张涛刘俊涛窦明
Owner ZHONGNAN DIAMOND CO LTD
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