Method determining content of nickel in nickel-titanium shape memory alloy

A memory alloy and nickel content technology, applied in the field of chemical analysis, can solve the problems of difficult observation of the titration end point, easy introduction of errors, long measurement cycle, etc., and achieve the effect of obvious mutation of the titration end point

Active Publication Date: 2013-02-13
AECC AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the long measurement cycle existing in the prior art, it is easy to introduce errors, and the color mutation is not sharp during titration, and it i

Method used

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  • Method determining content of nickel in nickel-titanium shape memory alloy
  • Method determining content of nickel in nickel-titanium shape memory alloy
  • Method determining content of nickel in nickel-titanium shape memory alloy

Examples

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Embodiment 1

[0023] This embodiment is a method for determining the nickel content in a titanium-nickel shape memory alloy, and the grade of the titanium-nickel shape memory alloy is TiNiss. This embodiment includes the following steps:

[0024] Step 1, sample weighing. Weigh 0.1g TiNiss sample and place it in a 250mL beaker. Obtain an accurately weighed TiNiss sample. The weight of the TiNiss sample to be weighed is accurate to 0.0001g.

[0025] Step 2, prepare the sample solution. Add 1 to 3 g of ammonium fluoride and 4 to 12 mL of pure nitric acid in sequence in a beaker, and dissolve it at 50 to 80 ° C to form a nitric acid solution, and the resulting nitric acid solution has no precipitates and impurities; in this example, the The dissolution temperature is 70°C. The wall of the beaker containing the obtained nitric acid solution was purged with distilled water in a conventional method, and the distilled water used for purging was mixed evenly with the nitric acid solution in the...

Embodiment 2

[0039] This embodiment is a method for the nickel content in a titanium-nickel shape memory alloy, and the grade of the titanium-nickel shape memory alloy is TiNiyy. This embodiment includes the following steps:

[0040] Step 1, sample weighing. Weigh 0.1g TiNiyy sample and place it in a 250mL beaker. Obtain an accurately weighed TiNiyy sample. The weight of the TiNiyy sample taken is accurate to 0.0001g.

[0041] Step 2, prepare the sample solution. Add 1 to 3 g of ammonium fluoride and 4 to 12 mL of pure nitric acid in sequence in a beaker, dissolve at 50 to 80 ° C to form a nitric acid solution, and the resulting nitric acid solution has no precipitates and impurities; in this example, the The dissolution temperature is 50°C. The wall of the beaker containing the obtained nitric acid solution was purged with distilled water in a conventional method, and the distilled water used for purging was mixed evenly with the nitric acid solution in the beaker to obtain a sample ...

Embodiment 3

[0055] This embodiment is a method for determining the nickel content in a titanium-nickel shape memory alloy, and the grade of the titanium-nickel shape memory alloy is TiNi-01. This embodiment includes the following steps:

[0056] Step 1, sample weighing. Weigh 0.1g TiNi-01 sample and place it in a 250mL beaker. Accurately weighed TiNi-01 samples were obtained. The weight of the TiNi-01 sample taken by weighing is accurate to 0.0001g.

[0057] Step 2, prepare the sample solution. Add 1 to 3 g of ammonium fluoride and 4 to 12 mL of pure nitric acid in sequence in a beaker, dissolve at 50 to 80 ° C to form a nitric acid solution, and the resulting nitric acid solution has no precipitates and impurities; in this example, the The dissolution temperature is 80°C. The wall of the beaker containing the obtained nitric acid solution was purged with distilled water in a conventional method, and the distilled water used for purging was mixed evenly with the nitric acid solution ...

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Abstract

The invention relates to a method for determining the content of nickel in a nickel-titanium shape memory alloy. The method comprises the following steps of: dissolving a sample with ammonium fluoride and nitric acid, and fluorating the sample; adding excessive EDTA (Ethylene Diamine Tetraacetic Acid) to make the EDTA completely complexed with nickel; regulating the acidity through an indicator; adding a buffer solution to control the acidity; titrating excessive EDTA by using a zinc scale; and determining the content of nickel by calculating. According to the method, the influence of titanium on the nickel during analysis is eliminated by masking the titanium, the end point mutation is obvious when the solution is titrated by regulating the acidity, and the more accurate content of nickel elements can be acquired by analyzing iron elements. The method for determining the content of the nickel in the nickel-titanium alloy has the advantages of simple process, obvious titration end point mutation, high recovery rate and high precision; the influence of Fe3<+> on the determination of the nickel can be eliminated; and the defects that methyl orange is used as an indicator to regulate the acidity, and xylenol orange is used as an indicator of complexometric titration end points in the conventional method to cause that the acidity control deviation is larger, and the titration end points are not obvious are overcome.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis, and relates to a technique for measuring nickel content in titanium-nickel shape memory alloys, in particular to a technique for measuring nickel content in iron-containing titanium-nickel alloys. Background technique [0002] At present, there is no method for the determination of nickel content in titanium-nickel alloys in national standards and navigational standards. The methods that can be found involve steps such as sample dissolution, transfer, fractionation, acidity adjustment, and titration, and can only be applied to titanium-nickel alloys that do not contain iron. Hydrochloric acid is used to dissolve the sample. The method is time-consuming and easy to cause hydrolysis of the sample, making the solution turbid, resulting in test failure; transfer and fractionation are easy to introduce errors and affect the accuracy of the analysis results; the acidity adjustment process use...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N1/28
Inventor 马静刘朝郭子静岳航赵勇
Owner AECC AVIATION POWER CO LTD
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