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Oxygen, Nitrogen, and Hydrogen in Refractory Metals

Summary

One of the most critical chemical specifications of titanium alloys is the hydrogen content. Too high of a

hydrogen content can cause hydrides to precipitate, which can lead to embrittlement and subsequent

cracking when the alloy is stressed. Hydrogen pickup typically occurs during downstream processing steps

such as heat treating, pickling, and cleaning.

The LECO ONH836 is a simultaneous oxygen, nitrogen, and hydrogen determinator that utilizes an electrode furnace, inert carrier gas, and both infrared and thermal conductivity detection to meet the analytical needs of the refractory metal industry. 

This application note was written specifically for use with the LECO ONH836 series determinator.

LECO—Your source for total analytical solutions

CS CS 844 and 744 Series: Carbon/Sulfur by Combustion

Carbon and sulfur determination by combustion infrared detection

Quick, accurate, and affordable determination for both production control and research

Calibration, analysis, evaluation, and diagnostic functions accessible via user-friendly brand software

GDS GDS 500A and 850A Atomic Emission Spectrometers

Spectral range from 120 to 800 nm

Continuous profile of concentration/thickness

Large, dynamic range with concentrations from ppm to 100% by weight

Short analysis time (minutes)

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Procedure - Solid Samples

Prepare the instrument as outlined in the operator's instruction manual.

Determine the instrument blank.

Login a minimum of 3 Blank replicates.

Press the Analyze button on the instrument screen. After a short delay, the loading head slide-block will open. Place a 502-344 Nickel Basket into the loading head.

Note: samples using automation should be placed in the appropriate autoloader position before starting the

analysis sequence. Once the sequence has started, the automatic analysis will start and end automatically.

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公司介绍：

美国力可公司(LECO)始于1936年 ，以生产用于冶金、机械、能源、化工、农业、食品及科研开发领域的各种分析仪器。

ONH836氧气/氮气/氢气元素分析仪设计用于使用惰性气体熔融技术对无机材料，铁和非铁合金以及耐火材料中的氧，氮和氢含量进行宽范围的测量。

坚固的样品加载区域可简化日常维护并大程度减少大气污染

用于氧气检测的三重红外电池可实现业内大的检测范围

通过自动化选项提高实验室生产率

可用的自动清洁器大程度地减少了两次分析之间的手动清洁需求

适用于坩埚和样品的20位往复式装载机

安装在动臂上的触摸屏界面可提供更好的人体工程学设计和直观的操作

红外（IR）和热导率（TC）检测器，没有活动部件，也无需手动调节

改善TC电池的稳定性

可绕过的OMI-2载气洗涤塔，提高了TC电池的稳定性

获得Dyanamic流量补偿可进一步增强TC细胞的稳定性

无需人工干预的全自动清扫系统。

Oxygen, Nitrogen, and Hydrogen in Refractory Metals

Summary

Oxygen and nitrogen are alloying elements in titanium, and are also classified as alpha stabilizing elements as they promote alpha phase alloys. Interstitial oxygen and nitrogen levels can be used to regulate the tensile strength of the material, but due to its high solubility can cause unwanted surface embrittlement. This phenomenon can be leveraged,however, under controlled processing to create surface films that increase surface hardness and wear properties.

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Procedure – Powder/Chip Samples

Instrument calibration/drift correction.

Add approximately 0.05 g of *** Graphite Powder to a***Graphite Crucible.

Firmly place the crucible on the lower electrode tip or appropriate autoloader position.

Press the Analyze button on the instrument screen,the lower electrode will close and the analysis sequence will start and end automatically.

Repeat steps 3b through 3i a minimum of three times for each calibration/drift standard used.

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