Soldering flux for brazing diamond cemented carbide sand and preparation method for soldering flux

A cemented carbide and diamond technology, which is applied in the field of diamond carbide brazing flux, can solve the problems of small spreading area and shear strength, poor brazing performance, etc., and achieve increased spreading area and good weld appearance , good wetting effect

Active Publication Date: 2012-12-12
HENAN FAMOUS DIAMOND IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, QJ102 and silver flux FB101, FB102 and FB104 are mostly used, but the brazing performance is poor, and the spreading area and shear strength are relatively small.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: The diamond hard metal brazing flux of this example consists of the following components: 60.5g of H 3 B0 3 , 12g of Na 2 B 4 O 7 , 1g of CoCl 2 , 5g of KBF 4 , 12g of NaF, 9g of Mo oxide, 0.5g of W oxide.

[0018] The preparation method of flux for diamond hard metal brazing, the steps are as follows: take H 3 BO 3 , Na 2 B 4 O 7 , CoCl 2 , KBF 4 , NaF, Mo oxides and W oxides were put into a drying box and dried at 200°C for 0.5-1 hour; the above components were mixed uniformly, put into a ball mill to grind to more than 200 mesh, and put into a beaker, Take 100ml of distilled water and mix with it to obtain the flux.

[0019] The above flux is used for vacuum brazing of C-6A cemented carbide containing molybdenum with CVD diamond, the vacuum degree is 1×10 -1 ~1×10 -3 Pa, the brazing material is BNi-2 nickel-based brazing material, the brazing temperature is 1100 ℃, and the heat preservation is 30 minutes, to obtain a brazed joint with high strength and beautiful...

Embodiment 2

[0020] Example 2: The diamond hard metal brazing flux of this example consists of the following components: 30g of H 3 BO 3 , 33g of Na 2 B 4 O 7 , 10g of CoWO 4 , 3g of CoCl 2 , 9g of KBF 4 , 2g of KF, 2g of Mo oxide, 1g of Ni oxide, 10g of W oxide.

[0021] The preparation method of flux for diamond hard metal brazing, the steps are as follows: take H 3 BO 3 , Na 2 B 4 O 7 , CoWO 4 , CoCl 2 , KBF 4 , KF, Mo oxides, Ni oxides and W oxides were placed in a drying oven at 200°C for 0.5-1 hour; mix the above components uniformly, put them in a ball mill and grind them to 200 meshes and put them in Take 100ml of distilled water and mix with it in the beaker to obtain the flux.

[0022] The above-mentioned flux is used for YGl5 and CVD diamond brazing in the air. The brazing material adopts Ag-Cu-Ti solder, the brazing temperature is 680°C, and the holding time is 5 minutes, and a brazing joint with good wetting and excellent appearance can be obtained.

Embodiment 3

[0023] Example 3: The diamond hard metal brazing flux of this example consists of the following components: 53.7g of H 3 BO 3 , 20g of Na 2 B 4 O 7 , 4g of CoWO 4 , 14.8g KBF 4 , 0.5g of Mo oxide, 5g of Ni oxide, 2g of W oxide.

[0024] The preparation method of flux for diamond hard metal brazing, the steps are as follows: take H 3 BO 3 , Na 2 B 4 O 7 , CoWO 4 , KBF 4 , Mo oxides, Ni oxides and W oxides were placed in a drying oven at 200°C for 0.5-1 hour to dry; mix the above components uniformly, put them in a ball mill and grind them to over 200 meshes, and put them in a beaker , Take 100ml of distilled water and mix with it to get the flux.

[0025] The above flux is used for vacuum brazing of NCF600 nickel-containing alloy steel and CVD diamond, and the vacuum degree is 1×10 -1 ~1×10 -3 Pa, the solder is Cu-Sn-Ti copper-based solder, the brazing temperature is 950℃, and the heat preservation is 40 minutes, and a high-quality brazing joint can be obtained.

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PUM

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Abstract

The invention provides a soldering flux for brazing a diamond cement carbide. The soldering flux comprises the following components in percentage by weight: 12 to 33% of Na2B4O7, one or two of 5 to 14.8% of KBF4 and 2 to 12% of MF, wherein M is alkali metal, one or two of 0.5 to 10% of CoWO4 and 1 to 15% of CoCl2, one or two of 0.5 to 9% of an oxide of Mo, 0.5 to 5% of the oxide of Ni and 0.5 to 10% of the oxide of W, and the balance of H3BO3. The soldering flux for brazing the diamond cement carbide has a wide scope of application, and can be applied to brazing a cemented carbide such as Co, Mo and Ni and a diamond. Compared with conventional soldering flux, the soldering flux disclosed by the invention can increase an expanding area; a weld joint has a better appearance and high shearing strength, so that a brazing performance is improved.

Description

Technical field [0001] The invention relates to a flux for brazing, in particular to a flux for brazing of diamond hard alloy. Background technique [0002] Among natural substances, diamond has the highest hardness, excellent wear resistance, low friction coefficient, highest thermal conductivity, very low thermal expansion coefficient and high chemical inertness. It is the most ideal chip or thermal conductivity. Materials are widely used in machinery processing, stone processing and glass processing industries. Brazing of diamond and cemented carbide is a key technical problem that restricts the promotion and application of diamond tools. At present, the research on the solder for brazing diamond has been relatively mature, and the solders such as Ag-Cu-Ti and Cu-Sn-Ti are mostly used, but there are few reports on the solder for diamond and cemented carbide brazing. Chinese patent 89100555 discloses a flux for brazing diamond and cemented carbide. Its composition is 10-25% K...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/362B23K1/00B23K103/18
Inventor 李红波闫焉服惠新庆
Owner HENAN FAMOUS DIAMOND IND CO LTD
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