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Hydrogen Content Analyzer

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Hydrogen Content Analyzer

Hydrogen content analyzer device for molten aluminum. New series optimized for use with ultrasonic degassing!

Introducing the first hydrogen detection analyser or hydrogen content analyzer in molten Aluminium optimized for use after ultrasonic degassing. It detects hydrogen levels in aluminium foundries and casting industries, as high residual hydrogen can result in significant porosity after casting, leading to rejections or the risk of mechanical failure.

Our new hydrogen detection analyser is the solution for your foundry to effectively and rapidly measure the hydrogen content in aluminium melts. It is the best option also during ultrasonic degassing and ultrasonic grain refinement of molten aluminum.



Why is the Hydrogen Content Analyzer important in an aluminium foundry or cast house?

Hydrogen forms whenever molten aluminium comes into contact with water vapour, and easily dissolves into the melt. The gas tends to come out of the solution and forms bubbles when the melt solidifies. The detrimental effects arising from the presence of an excess of dissolved hydrogen in aluminium are numerous.

Hydrogen causes porosity in aluminium products leading to many casting defects, reduced mechanical properties like fatigue and lower corrosion resistance. Several methods are used to reduce the amount of dissolved hydrogen from the melt, such as furnace fluxing prior to the casting process or using in-line degassing equipment during the casting process.  The new hydrogen content analyser measures also during ultrasonic degassing

How does Ultrasonic Degassing work in molten aluminium?

Courtesy of

Ultrasonic treatment of metal melts can substantially improve the properties of castings, in particular, their microstructure and mechanical properties. Recently, new refinements to the technique using proprietary ultrasound  technology provide significant benefits to industrial continuous casting, offering an alternative to argon degassing, replacement of standard master alloy additives, and substantial improvements to microstructure.

Here we will look at the mechanisms that underlie ultrasonic liquid metal interactions, in particular how they apply to ultrasonic degassing and grain refinement. Finally, we will look briefly at our ultrasonic technology as applied to industrial continuous casting.


Applied to liquids including water and liquid metals, ultrasonic energy can induce cavitation: the formation of micro bubbles of vapour caused by rapid energy changes. Such bubbles, or voids, occur when the pressure is reduced to below the saturated vapour pressure of the liquid phase, then rapidly collapse or implode under high pressure, producing a shock wave and dissipating considerable energy. Cavitation is enhanced when nucleating centres are present; typically these are micro bubbles and impurities.

When casting aluminium and its alloys, the presence of hydrogen, usually in its atomic form,  can lead to porosity problems in the final product. To overcome this, a degassing process is often employed. In one approach, an inert gas such as argon is injected into the melt forming bubbles into which hydrogen diffuses forming molecular hydrogen.

The gas bubbled rise to the surface and are expelled. An alternative approach involves subjecting the melt to reduced pressure, but both processes have environmental and economic drawbacks.

During ultrasonic degassing, the micro bubbles that form during the low-pressure cycle provide nuclei for the formation of hydrogen bubbles. Essentially, hydrogen diffuses to these bubbles.  Assisted by ultrasonically induced acoustic flow and streaming, the hydrogen bubbles rise to the melt surface and are expelled.

This process has many advantages over the traditional methods, including reduced environmental cost and improved efficiency. Effectively ultrasonic degassing reduces the porosity of the cast increasing both strength and ductility.

Results ultrasonic degassing molten aluminium:

    • Improved metal homogenization, grain refinement and mixing of new alloys.
    • Excellent ultrasonic degassing results (defragments and wetted inclusions)
    • Excellent results after vibrating ‘in sump’ of a vertical Wagstaff DC caster.
    • Excellent results on a Bruno Presezzi continuous casting line.
    • Improved micro crystallization and alloy characteristics in casting.
    • Friction reduction between a tool (e.g. casting, drawing, extruding, molding).
    • Improved surface finish.

Info H-Test Analyser

The new H-Test Analyzer (HTA) makes it easier to substantially improve both – the Quality and the Reliability of your Aluminum castings, by enabling you to precisely control the Hydrogen content in the Aluminum melt just before casting. No under or over degassing. No rejections, no wastage of time or money.

  • HTA uses the reduced pressure technique to measure the H2 content. By controlled solidification, the partial pressure of all the H2 released is accurately measured and related to its percentage by HTA.
  • HTA gives you accurate quantitative information within 3 minutes of sampling, for you to optimize the level of degassing.HTA comes to you with a quality assurance from the trusted house of Nico van Dongen Consulting Ltd.

Features H-Test Analyser

  • 3-LED, 7-Segment Display for Readout in cc/100gm and ppm (Selectable by Menu options using keypad).
  • Display in cc/100gm or ppm (Selectable by Menu options using keypad).
  • PS-2 Keyboard
  • 6-button scratch free keyboard to select database fields including
  • LCD (16 X 2) interface for showing Company Name, Operator Name, Shift , Sample name, Date, Time, Furnace no., etc.
  • Thermal Printer (55mm paper size) interface for printouts for various parameters g. Date, Time Company Name, Operator Name, Sample name, Shift No., Furnace no, Sample Temperature, sample weight, Weight corrected Result in cc/ 100gm or ppm, Count of Number of operations.
  • USB Interface using pen drive (up to 8GB) for downloading Sample data in text
  • Fast and Accurate Analysis using sample weight
  • Rugged & Reliable
  • Electro – Pneumatic operation of machine for vacuum path using 10 kg or more Nitrogen GAS
  • Semi-automatic weight measurement and correction with respect to
  • Calibration done using certified pipettes with +/-0.01 least
  • Features enable and disable facility in Mode selection via
  • Self-leakage test for periodic maintenance in HTA
  • Works in the harsh environment of foundries up to 60°
  • Emergency STOP

Specifications H-Test Analyser

Overall Dimensions:   (62 x 62 x 110) cm

Overall weight:              131 kg

Electrical I/P:                 230V (+/- 10%), 50Hz, Single Phase with 5-meter armored power cable.

Power:                               1.25KVA

Sample Weight:             100gm nominal.

Measurement time:     3 minutes

Range:                                Up to 0.85 cc/100gm (0.76 ppm)

Sensitivity:                       +/- 0.01cc /100gm

Accuracy:                          Less than 5% difference between H-Test Method & Vacuum Sub-Fusion Method.

Working ambient:        60 C Max.

Sialon data sheet

Material data sheet Sialon (Si3Al3O3N5)
Typical Sialon grades NVD-001 NVD-002 NVD-003 NVD-004
Bulk Density g/cm3 3.2 3.1 3.3 3.2
Water Absorption 0 0 0 0
Flexural Strength MPa 580 900 1,020 790
Vickers Hardness HV1 GPa 13.9 12.7 15.0 13.8
Fracture Toughness (SEPB) MPam1/2 4 ~ 5 6 ~ 7 7 6 ~ 7
Young’s Modulus of Elasticity GPa 290 270 300 290
Poisson’s Ratio 0.28 0.28 0.28 0.28
Coefficient of Linear Thermal (40 – 800 °C)


×10-6/℃ 3.2 3.4 3.3 3.5
Thermal Conductivity (20℃) W/(m・k) 25 23 27 54
Specific Heat J/(g・k) 0.64 0.66 0.65 0.66
Heat Shock Resistance 550 800 800 900
Volume Resistivity (20℃) Ω・cm >1014 >1014 >1014 >1014

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