TDS Thermal Desorption Mass Spectrometry

NegotiableUpdate on 02/04

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Overview

The application of TDS thermal desorption mass spectrometry can produce results within 30 minutes, while traditional methods require multiple days. Therefore, this is a feasible method for diffusible hydrogen pre welding testing. This allows users to optimize their processes to avoid costly failures before completing them.

Product Details

　　Why do I need diffusible hydrogen analysis?

Hydrogen induced cracking and embrittlement are dangerous phenomena. Although high-strength steel and oxygen copper grade are particularly susceptible to hydrogen embrittlement, the absorption of diffusible hydrogen affects more metals, but largely depends on environmental and process conditions such as humidity. Introducing hydrogen into every mechanical, thermal, and electrical manufacturing step carries risks, especially during welding and soldering processes.

　　TDS Thermal Desorption Mass SpectrometryApplications can produce results within 30 minutes, while traditional methods require multiple days. Therefore, this is a feasible method for diffusible hydrogen pre welding testing. This allows users to optimize their processes to avoid costly failures before completing them.

TDS热脱附质谱法

Thermal desorption mass spectrometry (TDS) is a surface analysis technique that can desorb hydrogen gas by heating a sample and detect and analyze the desorbed hydrogen gas using instruments such as mass spectrometers. During the heating process, hydrogen gas in the sample will gradually desorb from the steel and be detected by the mass spectrometer. The hydrogen content in steel can be calculated based on the temperature and peak area of hydrogen desorption.

TDS technology has the advantages of high sensitivity, good resolution, and fast analysis speed, and has therefore been widely used in fields such as materials science, chemistry, and semiconductor industry. In the steel industry, TDS technology can be used to detect the hydrogen content in steel and evaluate its quality. In addition, TDS technology can also be used to study the adsorption performance and catalytic reaction mechanism of materials.

The basic principle of TDS technology is to place the sample in a vacuum chamber, heat it to desorb gas molecules on the surface of the sample, and then analyze the desorbed gas using a mass spectrometer. In TDS experiments, it is necessary to control the heating temperature and time to obtain accurate results. At the same time, it is necessary to choose a suitable mass spectrometer and analysis conditions to ensure accurate detection of hydrogen in the sample.

In practical applications, TDS technology is often combined with other analytical techniques to improve the accuracy and feasibility of analysis. For example, TDS technology can be combined with techniques such as infrared spectroscopy and Raman spectroscopy to obtain more comprehensive information. In addition, TDS technology can be applied to online monitoring systems to achieve real-time monitoring and control.

1G4 PHOENIX DHTDS Thermal Desorption Mass SpectrometryMain advantages:

1. Optional thermocouple kit for direct sample temperature reading;

2. Additional resistance heating furnace, capable of providing high temperatures up to 1100 ℃;

3. Optional interface for external sampling tank, used to cover the GC method of ISO 3690;

4. An automatic and reliable gas calibration unit with 10 different volumes suitable for the entire analysis range;

5. Long term stable thermal conductivity detector (TCD) with dedicated reference gas channel, heat exchanger, and ng/g analysis function;

6. Infrared (IR) low heat mass furnace, used for precise temperature control, programmable fast heating (and cooling) up to 900 ℃, capable of accepting large samples;

7. The G4 quadrupole mass spectrometer has improved the detection limit by more than one order of magnitude, used for evaluating ultra-low diffusible hydrogen concentrations or isotopes and studying different hydrogen traps in steel.

2、 Technical parameters

	Specifications	advantage
detector
G4 PHOENIX	Thermal conductivity detector with reference channel and adjustable gain amplifier	Reliable, adjustable range, no drift
G4 PHOENIX Mass Spectrometry	Mass spectrometer, m/z range 1-100 amu, single quadrupole, optimized EI source and channel detector	Special mass spectrometry performance
stove
Infrared heating	IR furnace uop to 900 ℃, quartz tube 30mm, water-cooled, photoelectric thermocouple kit, used for direct sample temperature reading	Accurate temperature control, flexible heating program, accepting large samples
Resistance heating (optional)	Additional resistance heating furnace up to 1100 oC, with a quartz tube of 18 mm	Residual hydrogen gas in multiphase duplex steel
carrier gas	Nitrogen 99.995% purity, minimum 2 bar (± 50 psi), 99.9990% purity, used for microanalysis	Pre cleaning using regenerated molecular sieves
Calibration gas	Using pure gas (H2 or He) or certified mixtures (with a purity of 99.999% per component), the automatic gas dose calibration system can handle 10 individual volumes	Simple and accurate gas calibration, no need for standards, traceable to p, T, V
cooling water	1 liter/minute=3 bar (44 psi)	Rapid cooling, compatible with standard tap water, water-saving design and shut-off valve, chiller unit is also possible
power supply
G4 PHOENIX	230 VAC (± 10 %), 50-60 Hz, 2200 VA	Industry standard power supply and current configuration
mass spectrometer	230 VAC, 50-60 Hz, 250 VA
Dimensions and Weight
G4 PHOENIX	630 x 700 x 670 mm (width x depth x height), weight~50 kg
mass spectrometer	630 x 640 x 480 mm (width x depth x height), weight~60 kg

Although TDS technology has many advantages, there are also some limitations. Firstly, TDS technology can only detect gas molecules on the surface of the sample and cannot directly measure the gas content inside the sample. Secondly, TDS technology has different sensitivities to different types of gas molecules, so it needs to be optimized for specific applications. In addition, the operation process of TDS technology is relatively complex and requires certain professional knowledge and skills.