Migration treatment method and detection method of cubic boron nitride abrasive metal impurities
A cubic boron nitride and metal impurity technology, which is used in material excitation analysis, preparation of test samples, thermal excitation analysis, etc. problem, to achieve the effect of increasing solubility, small surface tension and small specific gravity
Active Publication Date: 2018-08-03
FUNIK ULTRAHARD MATERIAL
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Problems solved by technology
[0003] In the prior art, digestion equipment such as high-pressure reactors and microwave digestion furnaces are mainly used to remove metal impurities in cubic boron nitride, but the digestion results obtained are not satisfactory.
This is mainly due to the fact that the content of metal impurities on the surface of high-purity cubic boron nitride abrasives is at trace levels. Traditional acid digestion systems often use non-volatile acids such as phosphoric acid and sulfuric acid. Due to the viscosity of such acids Relatively large, relatively high boiling point, will cause a heavy burden on the digestion equipment
Therefore, for the cubic boron nitride abrasive material, there is no effective ablation method at present, and it needs to be developed and researched.
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[0019] The technical solutions of the present invention will be described in further detail below through specific implementation methods.
[0020] The embodiment of the present invention provides a treatment method for cubic boron nitride metal impurity migration, the steps of which are: accurately weigh about 0.2-5 g of cubic boron nitride sample to be tested in a polytetrafluoroethylene crucible, wet it with a small amount of high-purity water, Put it under a fume hood, add 1~10ml of concentrated hydrochloric acid and 1~10ml of concentrated nitric acid in turn, put it on an electric heating plate, and heat it at 90~200℃ for 1~3h. After cooling to room temperature, add 1-10ml of perchloric acid and 1-10ml of hydrofluoric acid, cover and heat at 90-200°C for 1-3 hours. Then take off the crucible cover, raise the temperature to 100-250°C, keep the temperature for 1-3h, wait until the perchloric acid smokes out, take it off and cool. Add 1-10 ml of the concentrated hydrochlori...
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Abstract
The invention provides a migration processing method of cubic boron nitride abrasive metal impurity. The method is characterized in that hydrochloric acid, nitric acid, hydrofluoric acid and perchloric acid are combined and heated for dissolving the metal impurity on surface of a cubic boron nitride abrasive to obtain a metal impurity migration solution. According to the method, migration of the metal impurity of the cubic boron nitride abrasive can be carried out as soon as possible. The invention also provides a method for detecting the metal impurity of the cubic boron nitride abrasive. The method mainly employs a plasma emission spectrum method for detecting the metal impurity migration solution prepared by the above method. The employed migration processing method can reduce viscosity of the used solution, and reduces damage on digestion equipment during a detection process.
Description
technical field [0001] The invention belongs to the field of superhard materials, and in particular relates to a migration treatment method and a detection method of cubic boron nitride abrasive metal impurities. Background technique [0002] Cubic boron nitride abrasive has high hardness and good chemical stability. The existing synthesis technology uses a complex metal alloy system as a catalyst, which will inevitably cause more or less wrapped catalyst residues in the cubic boron nitride abrasive, and its binding performance with the binder, thermal stability, etc. will have a greater impact. The later purification, cleaning and other steps will have an impact on the purity of the product. Therefore, the impurity analysis of superhard material cubic boron nitride is of great significance to the evaluation of material quality and production process. [0003] In the prior art, digestion equipment such as high-pressure reactors and microwave digestion furnaces are mainly ...
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IPC IPC(8): G01N21/71G01N1/34
CPCG01N1/34G01N21/71
Inventor 张君利董永芬
Owner FUNIK ULTRAHARD MATERIAL