Cobalt leaching solution system, hard alloy cobalt leaching method and blade with diamond coating

A cemented carbide and cemented carbide substrate technology, applied in metal material coating process, coating, gaseous chemical plating and other directions, can solve the problems of poor adhesion, loose structure and great influence of decobalt effect, etc. Achieve the effect of improving cutting performance and service life, ensuring hardness and flexural strength, and setting reasonable decobalt steps

Active Publication Date: 2016-07-27
FUNIK ULTRAHARD MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor adhesion of the diamond coating on the cemented carbide insert substrate, it is easy to fall off from the substrate, seriously affecting the cutting performance and service life of the diamond coated insert, and one of the key factors is the cemented carbide substrate The presence of cobalt in
[0004] At present, chemical treatment is mainly used to remove cobalt from the cemented carbide substrate. Although this method can effectively remove the cobalt content on the surface of the blade and improve the bonding strength, there are mainly the following problems: the decobalt effect of this method is affected by the components of the cobalt removal solution. The impact is relatively large. Improper composition of the cobalt removal solution will cause the cobalt accumulation area to be transformed into a huge deep pit after corrosion, and at the same time cannot overcome the migration and diffusion of cobalt to the cobalt-poor layer during high temperature deposition; and this method can only remove the superficial depth. If the cobalt is processed for a long time, it will easily form a tungsten carbide layer with a loose structure, thus forming a weak point between the coating and the blade bonding surface, affecting the bonding strength between the coating and the blade, and at the same time making the hardness of the blade matrix and The bending strength has decreased, reducing the cutting performance and service life of the insert

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] This embodiment provides a cobalt removal solution system, including an acidic solution A and an alkaline solution B, wherein the acidic solution A includes the following components: 2.0% H by volume 2 SO 4 Solution, 18% by volume H 2 o 2 Solution, 80% by volume H 2 O; wherein, H in the acidic solution A 2 SO 4 The mass fraction is 70%, H 2 o 2 The quality score is 80%. Alkaline solution B includes the following components: the mass percent is 10% K 3 [Fe(CN) 6 ], 10% NaOH, 80% H 2 O.

[0023] This embodiment also provides a method for removing cobalt from cemented carbide, which specifically includes the following steps:

[0024] Configure the cobalt removal solution system: respectively use 2.0% H by volume percentage 2 SO 4 solution, 18% H 2 o 2 solution, 80% H 2 O is configured into an acidic solution A; the mass percentage is 10% K 3 [Fe(CN) 6 ], 10% NaOH, 80% H 2 O is configured into alkaline solution B;

[0025] The first pickling: first, sand...

Embodiment 2

[0032] This embodiment provides a cobalt removal solution system, the specific components are roughly the same as those in Example 1, the difference is that the components of the acidic solution A include 0.5% by volume of H 2 SO 4 solution, 15% H 2 o 2 solution, 1.0% HNO 3 solution; wherein, the H 2 SO 4 The mass fraction is 98%; the H 2 o 2 The mass fraction of is 40%; The HNO 3 The mass fraction of the solution is 70%.

[0033] The alkaline solution B comprises the following components: the mass percent is 3% K 3 [Fe(CN) 6 ], 5% NaOH, 92% H 2 O.

[0034] This embodiment also provides a method for removing cobalt from cemented carbide, and the specific steps are roughly the same as in Embodiment 1, except that:

[0035] The cobalt removal solution system provided in this embodiment is used to carry out the first pickling, alkali cleaning and second pickling of the hard alloy substrate respectively, wherein the cobalt content on the surface of the hard alloy subst...

Embodiment 3

[0039] This embodiment provides a cobalt removal solution system, the specific components are roughly the same as those in Example 1, the difference is that the components of the acidic solution A include HNO with a volume percentage of 1.5% respectively 3 solution, 15% H 2 o 2 solution, 83.5% H 2 O, where the HNO 3 The mass fraction of the solution is 98%, H 2 o 2 The mass fraction of is 50%; Described alkaline solution B comprises following composition: mass percentage is respectively the K of 8% 3 [Fe(CN) 6 ], 9% KOH, 83% H 2 O.

[0040] This embodiment also provides a method for removing cobalt from cemented carbide, and the specific steps are the same as those in Embodiment 1.

[0041] This embodiment also provides a diamond-coated blade, including a blade base and a diamond coating attached to the surface of the blade base, the blade base is a cemented carbide base processed by the above-mentioned cemented carbide decobaltization method, and passed A diamond coa...

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Abstract

The invention provides a cobalt leaching solution system which comprises an acid solution A and an alkaline solution B. The acid solution A comprises H2SO4 or HNO3, H2O2 and H2O, and the alkaline solution B comprises K3[Fe(CN)6], H2O and NaOH or KOH. The invention further provides a method for cobalt leaching of hard alloy through the cobalt leaching solution system, and a blade with a diamond coating, and the blade with the diamond coating is formed by settling a diamond layer on a hard alloy base body which is subjected to cobalt leaching through the hard alloy cobalt leaching method. The cobalt leaching solution system is easy to prepare and good in cobalt leaching effect. The method is reasonable in step arrangement and easy to operate. A blade base body and the blade surface coating of the obtained blade with the diamond coating have high bonding strength.

Description

technical field [0001] The invention relates to the field of superhard materials, in particular to a cobalt removal solution system, a hard alloy cobalt removal method and a diamond-coated blade. Background technique [0002] Carbide blades have a series of excellent properties such as high hardness, wear resistance, heat resistance, and corrosion resistance, and are widely used as cutting blade materials. However, with the development of industry and technology, more and more difficult-to-process materials are emerging in large numbers. A single cemented carbide material can no longer meet the needs of the industry, so cemented carbide coated inserts have been produced. Among them, due to the chemical vapor deposition (CVD) diamond film has many excellent properties close to natural diamond, such as high hardness and large elastic modulus. , low friction coefficient, strong wear resistance and stable surface chemical properties, etc., and the preparation of CVD diamond film...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/02C23C16/27C23F1/28C23F1/40
CPCC23C16/0227C23C16/27C23F1/28C23F1/40
Inventor 许立
Owner FUNIK ULTRAHARD MATERIAL
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