GB/T 4184-2021Tungsten-rhenium alloy wires (English PDF)

4.1 Chemical Composition

In accordance with chemical composition, tungsten-rhenium alloy wires are divided into three designations. W-1Re, W-3Re and W-5Re. The chemical composition of tungsten-rhenium alloy wires shall comply with the provisions in Table 1.

6.4.3 Disqualification judgment

If the sample under test passes the inspection of all items listed in Table 10, then, it is judged as qualified. If it fails in the inspection of one or more items, then, it is judged as disqualified.

6.5 Quality Conformity Inspection

6.5.1 Inspection items

The quality conformity inspection items shall be carried out in accordance with Table 10.

6.5.2 Inspection batch

Products of the same designation, same raw materials, same process, same production batch number and same production period are one inspection batch.

6.5.3 Sampling and qualification judgment

Group A and Group B are subject to 100% inspection and disqualified products are eliminated.

Group C inspection is carried out on one specimen randomly taken from each inspection batch.

If one or more results fail to comply with the requirements, double sampling shall be performed in the inspection batch and the disqualified items shall be inspected. If one or more results still fail to comply with the requirements, then, the batch will be judged as disqualified.

6.6 Re-inspection

The demand-side shall conduct re-inspection in accordance with this document within three months from the date of receipt of the product. If the inspection result is inconsistent with the product certificate or product quality certificate, an appraisal or inspection shall be jointly carried out, or a third party recognized by both sides shall be entrusted to conduct an inspection.

If it still fails to meet the requirements, then, it shall be deemed disqualified.

7.1 Packaging, Storage and Transportation

Tungsten-rhenium alloy wire with a diameter phi <= 0.35 mm shall be evenly rewound on the wire coil without local accumulation or the phenomenon of pressed wire being unable to be released.

The exposed wire head needs to be fixed, the surface shall be sealed with flint-glazed paper, and then, loaded into a plastic cylinder. The material and specifications of the wire coil shall be determined by negotiation between the supply-side and the demand-side.

When winding tungsten-rhenium alloy wire with a diameter phi > 0.35 mm, it shall be wound into a coil and tied with soft metal wire in 3 to 4 sites to prevent the wire from bouncing open

A.1 Overview

The method provided in this Appendix is for the determination of rhenium in tungsten-rhenium alloy. The mass fraction of rhenium ranges from 1% to 10%.

A.2 Method Summary

The specimens are decomposed by hydrogen peroxide and determined by inductively coupled plasma emission spectrometer.

A.3 Reagents

A.3.1 Nitric acid. (1 + 1) analytically pure.

A.3.2 Hydrogen peroxide. mass concentration c is 1.10 g/mL.

A.3.3 Hydrochloric acid. (1+1) guaranteed reagent.

A.3.4 Rhenium standard solution. weigh-take 1.0000 g of metallic rhenium powder (>= 99.99%) into a 150 mL beaker, add 20 mL of hydrochloric acid (see A.3.3) and 5 mL of nitric acid (see A.3.1), heat, until it is completely dissolved, cool to room temperature, transfer into a 1,000 mL volumetric flask, use deionized water to dilute it to the scale, and mix it well. The rhenium mass concentration c of this solution is 1,000 µg/mL.

A.3.5 Pure tungsten solution. weigh-take 5.0000 g of metallic tungsten powder (>=99.99%) into a 150 mL beaker, in several times, dropwise add 30 mL of hydrogen peroxide (see A.3.2), heat at low temperature, until it is completely dissolved, add 10 mL of deionized water, boil, remove and cool to room temperature. Transfer it to a 1,000 mL volumetric flask, use deionized water to dilute it to the scale, and mix it well. The tungsten mass concentration c of this solution is 5,000 µg/mL.

A.4 Instruments

Inductively coupled plasma emission spectrometer.

A.5 Specimens

The specimens shall be prepared into a state that is easy to dissolve.

A.6 Analytical Steps

A.6.1 Number of determinations

Perform two independent determinations and take the average value.

A.6.2 Test portion

Weigh-take 0.1 g of specimen, accurate to 0.0001 g.

A.6.3 Blank test

Carry out a blank test along with the test portion.

A.6.4 Determination

A.6.4.1 Place the test portion (see A.6.2) in a 150 mL beaker, use an appropriate amount of deionized water to moisten it, dropwise add 6 mL of hydrogen peroxide (see A.3.2), heat at low temperature, until the test portion is completely dissolved, add 10 mL of deionized water, boil, remove and cool to room temperature. Transfer it to a 100 mL volumetric flask, use deionized water to dilute to the scale, and mix it well.

A.6.4.2 Draw a working curve. respectively pipette 0.00 mL, 1.00 mL, 3.00 mL, 5.00 mL, 8.00 mL and 10.00 mL of the rhenium standard solution (see A.3.4) into a set of 100 mL volumetric flasks, add 20.00 mL of the pure tungsten solution (see A.3.5), use deionized water to dilute it to the scale, and mix it well. Ignite the plasma, wait for the instrument to stabilize, and then, at a wavelength of 358.015 nm, in the sequence of increasing concentration, successively determine and draw the working curve.

A.6.4.3 Determine the solution (see A.6.4.1) at a wavelength of 358.015 nm and obtain the corresponding rhenium content based on the working curve.

A.7 Result Calculation

In accordance with Formula (A.1), calculate the mass fraction of rhenium.

Where, wRe---the mass fraction of rhenium element; c1---the mass concentration of the element under test in the specimen solution, expressed in (µg/mL); c0---the mass concentration of the element under test in the sample blank solution, expressed in (µg/mL);

V---the volume of the solution under test, expressed in (mL); m---the mass of the specimen, expressed in (g). […]