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Method for determining contents of aluminum, niobium, tungsten and chromium in high-niobium-aluminum-titanium alloy

An aluminum-titanium alloy and determination method technology, applied in the field of spectrochemical analysis and testing, can solve the problems of large differences, poor analysis efficiency, different analysis methods, etc. Effect

Inactive Publication Date: 2018-11-27
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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Problems solved by technology

[0003] The composition content of high-niobium aluminum-titanium alloys is quite different from that of conventional titanium alloys. The current titanium alloy determination standards ASTM E2371 and GB / T4698 cannot determine the tungsten content, and aluminum, niobium, and tungsten exceed the current titanium alloy chemical composition determination standards ASTME 2371 And the determination range of GB / T4698, the elements determined by coupled plasma emission spectroscopy (ICP-OES) in the titanium alloy determination standard ASTM E 2371 are aluminum, niobium, and chromium, which can only be determined in the range of: Al: 0% ~ 8%, Nb: 0% ~ 6%, Cr: 0% ~ 5%, and in the titanium alloy determination standard GB / T4698, the analysis methods of each element are different, it is impossible to realize the simultaneous determination of multiple elements, and the analysis efficiency is poor. Alkali separation- The range of aluminum element determined by EDTA complexometric titration is: Al: 0.8%~8%, the element determined by emission spectrometry is: aluminum, chromium, and its range is: Al: 0.01% ~0.15%, Cr: 0.02% ~0.2%, the range of chromium element measured by ferrous ammonium sulfate titration method is: 0.3% ~12%, and the range of niobium element measured by 5-Br-PADAP spectrophotometry is: Nb: 0.2% ~3%, none of these methods can meet the composition range in Al: 25%~35%, Nb: 10%~16%, Cr: 0.5%~2.5%, W: 0.5%~1.5% high niobium aluminum titanium alloy Analysis requirements for Al, Nb, Cr, and W. At present, there is no report on the simultaneous determination of aluminum, niobium, tungsten, and chromium in high-niobium aluminum-titanium alloys

Method used

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  • Method for determining contents of aluminum, niobium, tungsten and chromium in high-niobium-aluminum-titanium alloy
  • Method for determining contents of aluminum, niobium, tungsten and chromium in high-niobium-aluminum-titanium alloy
  • Method for determining contents of aluminum, niobium, tungsten and chromium in high-niobium-aluminum-titanium alloy

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Experimental program
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Effect test

Embodiment 1

[0036] Step 1: Prepare the sample solution to be tested first: weigh 0.1g of the high-niobium aluminum-titanium alloy sample to be tested in a polytetrafluoroethylene beaker, add distilled water and 15mL of hydrochloric acid, then add 2mL of hydrofluoric acid drop by drop, and heat at low temperature until The sample is completely dissolved, then add 2 mL of nitric acid, continue to heat at low temperature until the reddish-brown smoke in the solution disappears, cool to room temperature, transfer to a 250 mL plastic volumetric flask, add water to make up the volume, and shake well to obtain the sample solution to be tested, set aside, parallel Process 2 samples to be tested;

[0037] Step 2, preparation of standard solution: Weigh 4 parts of high-purity titanium and high-purity aluminum matched with the sample, and place them in 8 polytetrafluoroethylene beakers respectively. The purity of the high-purity titanium is 99.99%, and the high-purity The purity of pure aluminum is ...

Embodiment 2

[0046] Embodiment 2: Determination of the detection limit of aluminum, niobium, tungsten, chromium content in high-niobium aluminum-titanium alloy

[0047] After the calibration curve is established, the measured value of the blank solution without adding the standard solution is the method blank value, and the parallel measurement is performed 10 times. Three times the standard deviation of the blank value is the detection limit of the method, and the results are listed in Table 3 below.

[0048] Table 3 Method detection limit

[0049]

[0050] It can be seen from Table 3 that the detection limits are low, all below 0.006%. It can be seen that this determination method has high sensitivity and can meet the needs of determination of aluminum, niobium, tungsten and chromium.

Embodiment 3

[0051] Embodiment 3: precision test

[0052] The BG-2A1 sample was measured 6 times, and the relative standard deviation RSD was the precision. The results are listed in Table 4 below:

[0053] Table 4 Precision test results

[0054]

[0055] It can be seen from the above table 4 that the relative standard deviation (RSD) of the repeated determination samples is not more than 5%, and the precision is high.

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Abstract

The invention provides a method for determining contents of aluminum, niobium, tungsten and chromium in a high-niobium-aluminum-titanium alloy. The method is used for determining the contents of aluminum, niobium, tungsten and chromium in the high-niobium-aluminum-titanium alloy by adopting inductively coupled plasma atomic emission spectroscopy, and specifically comprises the following steps: preparing a to-be-determined sample solution, preparing a standard solution, establishing a standard curve, determining the content of each element in the to-be-determined sample solution, and the like.According to the method disclosed by the invention, a series of standard solutions can be prepared by a matrix matching method, matrix interference and interference of inter-element spectral lines canbe reduced, the aluminum, niobium, tungsten and chromium in the high-niobium-aluminum-titanium alloy can be simultaneously analytically determined on an inductively coupled plasma optical emission spectrometer, the quantitative range can cover the detection requirement of the high-niobium-aluminum-titanium alloy, the analytical method is simple to operate, and a reliable guarantee is provided forproduction, scientific research, application and quality control of the high-niobium-aluminum-titanium alloy.

Description

technical field [0001] The invention relates to the technical field of spectrochemical analysis and testing, in particular to a method for determining the contents of aluminum, niobium, tungsten and chromium in high-niobium aluminum-titanium alloys. Background technique [0002] High-niobium aluminum-titanium alloy is an emerging lightweight high-temperature structural material, which is widely used in aerospace and automotive fields, and is a research hotspot in material science research in recent years. Aluminum, niobium, tungsten, chromium and other elements in high-niobium aluminum-titanium alloy can greatly improve the plasticity, strength, fracture toughness, creep performance and oxidation resistance of the material. Evaluation provides data support; [0003] The composition content of high-niobium aluminum-titanium alloys is quite different from that of conventional titanium alloys. The current titanium alloy determination standards ASTM E2371 and GB / T4698 cannot de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/73G01N1/28
CPCG01N1/28G01N21/73G01N2001/2893
Inventor 张斌彬杜米芳刘攀
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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