A connection method between pdc and cemented carbide

A technology of cemented carbide and connection method, which is applied in welding equipment, metal processing equipment, welding/welding/cutting items, etc., can solve the problems of weakening PCDPDC performance and affecting the quality of PDC composite sheets, and achieves low manufacturing cost and practical effect. Good, low melting temperature effect

Active Publication Date: 2018-04-20
宁波中机松兰刀具科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thermal damage of PCD caused by high brazing temperature in the prior art will cause the performance of PDC to weaken, thereby affecting the quality of PDC composite sheet

Method used

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  • A connection method between pdc and cemented carbide
  • A connection method between pdc and cemented carbide
  • A connection method between pdc and cemented carbide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0033] One, a kind of connection method of PDC and cemented carbide, comprises the following steps:

[0034] a. Cleaning: Put PDC1 and cemented carbide 3 into an ultrasonic cleaner for 10-15 minutes, and dry them with a hair dryer after cleaning;

[0035] b. Surface modification: use the method of surface modification to modify the connected surface of PDC1 and cemented carbide 3, so that the nickel-plated layer is formed on the connected surface. Wherein, the non-PCD end of the PDC is the connected surface. After modification, a nickel-plated layer, 101, is formed at one end of the PDC1, and a nickel-plated layer II301 is formed at one end of the cemented carbide 3. In order to prevent the PCD at the upper end of PDC1 from being damaged by heat, the connected surface of PDC1 cannot be modified by surface modification at a higher temperature, and nickel plating can be used on the connected surface by electroplating or other methods. The cemented carbide 3 has a high abilit...

Embodiment 1

[0049] Put the PDC and cemented carbide into the ultrasonic cleaning machine to clean for 15 minutes, and dry it with a hair dryer after cleaning; the non-PCD end of the PDC is the connected surface, and the connected surface is plated with a layer of 0.2mm thick Nickel-plated layer, a 0.2mm-thick nickel-plated layer is plated on the surface of the hard alloy to be connected by thermal spraying. The nickel-plated layer on the PDC is opposite to the nickel-plated layer on the hard alloy, and a layer of Ag75Cu solder is placed between the nickel-plated layer and the nickel-plated layer (Ag75Cu refers to the weight of silver accounting for 75%, the weight of copper 25% solder alloy). Put the assembled PDC, brazing filler metal and cemented carbide upright into the vacuum furnace, and the vacuum degree in the vacuum furnace reaches 10 -1 After MPa, start heating, and heat up to 800° C. at a heating rate of 5° C. / min, and 800° C. is the highest heating temperature in this embodim...

Embodiment 2

[0052] Clean the PDC and hard alloy in an ultrasonic cleaning machine for 10 minutes, and dry it with a hair dryer after cleaning; use electroplating to plate a layer of nickel-plated layer I with a thickness of 0.15mm on the non-PCD end of the PDC. One end is coated with a 0.15mm thick nickel layer II by thermal spraying. The nickel-plated layer I on the PDC is opposite to the nickel-plated layer II on the hard alloy, and a layer of Ag72Cu eutectic solder is placed between the nickel-plated layer I and the nickel-plated layer II. Put the assembled PDC, brazing filler metal and cemented carbide upright into the vacuum furnace, and the vacuum degree in the vacuum furnace reaches 10 -3 Start heating after MPa, and heat to 779°C at a heating rate of 10°C / min (the eutectic temperature of the AgCu eutectic solder may vary depending on the furnace and the slight difference in the composition of the solder), and hold for 3 minutes. Then lower the furnace temperature to 680°C, keep ...

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Abstract

The invention discloses a connection method of a PDC and a hard alloy. AgCuNi series brazing filler metal is adopted as brazing filler metal, and has the excellent properties of high strength, high plasticity and the like; the beneficial effects that the melting temperature of the AgCuNi series brazing filler metal is low, and the AgCuNi series brazing filler metal has the good wetting performance on the hard alloy are used, at the welding temperature of the AgCuNi series brazing filler metal, an AgCuNi component joint area which is connected with the hard alloy and has the excellent performance is formed, the aim that at the low temperature, the PDC is lengthened is achieved, and it is ensured that the property of the PDC is not damaged. The method is simple in technology, short in production period, low in manufacturing cost, capable of achieving batched production, good in practical effect and convenient to apply and popularize.

Description

technical field [0001] The invention relates to the technical field of connection of dissimilar materials, in particular to a method for connecting PDC and cemented carbide and a large-sized PDC prepared by the method. Background technique [0002] Polycrystalline diamond compact (PDC for short). PDC is usually sintered with diamond micropowder and a small amount of metal powder and cemented carbide substrate under ultra-high pressure and high temperature conditions. The part formed by mixing diamond micropowder with a small amount of metal powder and sintering under high temperature and high pressure is called polycrystalline diamond (polycrystalline diamond, referred to as PCD). PDC has the high hardness, high wear resistance and excellent thermal conductivity of diamond, as well as the strength and impact toughness of cemented carbide, so it is an ideal material for manufacturing cutting tools, drilling bits and other wear-resistant tools. PDC is generally manufactured ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/008B23K1/19B23K1/20B23K103/18
CPCB23K1/008B23K1/19B23K1/20B23K1/206
Inventor 龙伟民纠永涛钟素娟裴夤崟高雅轩庆庆孙华为杜全斌李秀朋李永
Owner 宁波中机松兰刀具科技有限公司
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