GB/T 24583.7-2019Vanadium-nitrogen—Determination of oxygen content—Infrared absorption method (English PDF)

Foreword

The analysis method of GB/T 24583 vanadium nitrogen alloy is divided into 8 parts.

--- GB/T 24583.1 Determination of vanadium content of vanadium-nitrogen alloys - Ammonium sulphate titration method;

--- GB/T 24583.2 Determination of nitrogen content of vanadium-nitrogen alloys - Inert gas fusion heat conduction method;

--- GB/T 24583.3 Determination of nitrogen content of vanadium-nitrogen alloys - Distillation - Neutralometric titration;

--- GB/T 24583.4 Determination of carbon content of vanadium-nitrogen alloys - infrared absorption method;

--- GB/T 24583.5 Determination of phosphorus content of vanadium-nitrogen alloys - bismuth phosphorus molybdenum blue spectrophotometric method;

--- GB/T 24583.6 Determination of sulfur content of vanadium-nitrogen alloys by infrared absorption method;

--- GB/T 24583.7 Determination of oxygen content of vanadium-nitrogen alloys - infrared absorption method;

--- GB/T 24583.8 Determination of silicon, manganese, phosphorus and aluminium content of vanadium-nitrogen alloys by inductively coupled plasma atomic emission spectrometry.

This part is the seventh part of GB/T 24583.

This part is drafted in accordance with the rules given in GB/T 1.1-2009.

This part replaces GB/T 24583.7-2009 "Determination of oxygen content of vanadium nitrogen alloys by infrared absorption method". This part and Compared with GB/T 24583.7-2009, the main technical changes are as follows.

--- The measurement range was changed from 0.10% to 2.00% to 0.10% to 4.00% (see Chapter 1, Chapter 1 of the 2009 edition);

---Modified "normative references" (see Chapter 2, Chapter 2 of the 2009 edition);

---Graphite crucible modified from high temperature graphite crucible to high purity graphite crucible suitable for instruments (see 4.12, 4.9 of 2009 edition);

---The carrier gas has increased argon (see 4.10, 4.7 of the 2009 edition);

--- Revised the method of preparation and preparation of the sample (see Chapter 6, Chapter 6 of the 2009 edition);

--- Modified the sample volume (see 7.2, 7.1 of the 2009 edition);

---Modified flux for measurement (see 7.6.1, 7.6 of 2009 edition);

--- Revised "Representation of Analysis Results" (see Chapter 8, Chapter 8 of the 2009 edition);

--- Replace the allowable difference with the reproducibility limit r and the reproducibility limit R of the inter-laboratory precision test data statistics (see Chapter 9, Chapter 9 of the 2009 edition).

1 Scope

This part of GB/T 24583 specifies the infrared absorption method for the determination of oxygen content in vanadium-nitrogen alloys.

This section applies to the determination of oxygen content in vanadium-nitrogen alloys. Measuring range (mass fraction). 0.10% to 4.00%.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 6379.1 Accuracy of measurement methods and results (accuracy and precision) Part 1: General and definition

GB/T 6379.2 Accuracy of measurement methods and results (accuracy and precision) Part 2: Determination of standard method of measurement The basic method of sex and reproducibility.

GB/T 8170 Numerical Rounding Rules and Representation and Determination of Limit Values

GB/T 20567 vanadium nitrogen alloy

3 Principle

The sample is placed in a graphite crucible with a helium flow, and is melted at a high temperature in a pulse heating furnace, and oxygen generates carbon monoxide and carbon dioxide gas from the carrier gas.

The flow is carried into an infrared detector, and the content of oxygen can be measured according to the characteristic that carbon monoxide and carbon dioxide absorb infrared light of a specific wavelength.

4 Reagents and materials

4.1 Magnesium perchlorate, anhydrous, granular.

4.2 Alkali asbestos, granular.

4.3 Glass wool.

4.4 Quartz cotton.

4.5 Tin particles, 0.2mm~0.8mm, if necessary, clean the surface with organic reagents, dry and set aside.

4.6 Tin capsule, phi (5~6) mm × 10mm.

4.7 Nickel capsule, phi6mm × (8~12)mm.

4.8 Nickel basket, phi7mm × 12mm.

4.9 Rare earth oxide copper.

4.10 Carrier gas, helium or argon, the purity is not less than 99.995%.

4.11 Power gas source, nitrogen or compressed air, with impurities (water and oil) content less than 0.5%.

4.12 Graphite crucible, suitable for high purity graphite crucibles.