Sensor and measurement method for measuring hydrogen content in metal melt

Patent metadata

Field	Value
Publication number	US-2018328881-A1
Application number	US-201515774205-A
Country	US
Kind code	A1
Filing date	Nov 30, 2015
Priority date	Nov 12, 2015
Publication date	Nov 15, 2018
Grant date	—

Abstract

A sensor and a measurement method for measuring hydrogen content in metal melt. The sensor has a solid proton conductor element, a reference electrode, a quasi-electrode to be measured, a reference compound, a through pipe and an insulating ceramic adhesive. The measurement method has the steps of: (1) inserting the sensor and a corrosion-resistant electrode into the metal melt, and making sure that the solid proton conductor element is fully immersed into the metal melt, the quasi-electrode to be measured is in direct contact with the metal melt and the contact surface is the electrode to be measured; (2) connecting a potentiometer and the reference electrode cable or the metal gas guide pipe to the corrosion-resistant electrode, and measuring a potential difference between the reference electrode and the electrode to be measured; and (3) calculating the hydrogen content S of the metal melt.

First claim

1 - 10 . (canceled)

11 . A sensor for measuring hydrogen content in metal melt, comprising:
a solid proton conductor element, a reference electrode, a quasi-electrode to be measured, a reference compound, a through pipe and an insulating ceramic adhesive, wherein the through pipe and the solid proton conductor element are connected through the insulating ceramic adhesive to form an inner space, the surface located in the space, of the solid proton conductor element, is an inner surface, and the surface exposed outside is an outer surface; the reference electrode is coated to the inner surface of the solid proton conductor element, and the quasi-electrode to be measured is the outer surface of the solid proton conductor element; the quasi-electrode to be measured is in contact with the metal melt during hydrogen measurement, and the contact surface forms the electrode to be measured; and the reference compound is gas, liquid or solid, is placed in the inner space and is in contact with the reference electrode.

12 . The sensor for measuring hydrogen content in metal melt according to claim 11 , wherein the sensor further comprises a gas guide pipe and a three-way clamp, wherein when the sensor comprises the gas guide pipe and the three-way clamp, the reference compound is gas, the three-way clamp is connected with an upper part of the through pipe, the gas guide pipe is inserted into the inner space formed by the through pipe, the insulating ceramic adhesive and the solid proton conductor element through the three-way clamp and is connected to the reference electrode, and when a bottom end of the gas guide pipe directly faces to the reference electrode and the solid proton conductor element, the bottom end of the gas guide pipe is a blind end, a side opening thereof acts as a gas outlet.

13 . The sensor for measuring hydrogen content in metal melt according to claim 12 , wherein the sensor further comprises a reference electrode cable, and when the reference compound is gas, the reference electrode cable is inserted into the through pipe through the three-way clamp, is connected with the reference electrode and is externally connected to a measuring circuit, and the reference electrode cable is metal platinum, gold, silver, nickel-chromium alloy, iron-chromium-aluminum alloy or stainless steel.

14 . The sensor for measuring hydrogen content in metal melt according to claim 11 , wherein the sensor comprises a reference electrode cable, wherein when the reference compound is liquid or solid, the reference electrode cable penetrates through the insulating ceramic adhesive, is connected with the reference electrode and is externally connected to a measuring circuit, and the reference electrode cable is metal platinum, gold, silver, nickel-chromium alloy, iron-chromium-aluminum alloy or stainless steel.

15 . The sensor for measuring hydrogen content in metal melt according to claim 14 , wherein when the reference compound is liquid or solid, the sensor further comprises an inert material of Al 2 O 3 , YSZ or Y 2 O 3 ; and the inert material is stuffed between the reference compound and the insulating ceramic adhesive.

16 . The sensor for measuring hydrogen content in metal melt according to claim 11 , wherein the solid proton conductor element has a tubular, spherical, flaky, discoid, cubic or cylindrical structure and is made of a perovskite or complex perovskite structure material.

17 . The sensor for measuring hydrogen content in metal melt according to claim 11 , wherein a material of the reference electrode is silver, platinum or gold.

18 . The sensor for measuring hydrogen content in metal melt according to claim 11 , wherein a material of the insulating ceramic adhesive is an alumina-based material.

19 . The sensor for measuring hydrogen content in metal melt according to claim 11 , wherein when the reference compound is gas, liquid or solid, the gas comprises Ar—H 2 , N 2 —H 2 , He—H 2 , O 2 —H 2 O or N 2 —NH 3 gas, which is doped or undoped with one or more inert gases, the liquid comprises Li—LiH, and the solid comprises Y—H, Ti—H, Zr—H or Sc—H.

20 . A method for measuring hydrogen content in metal melt by using the sensor for measuring hydrogen content in metal melt according to claim 11 , the method comprising the following steps of:
(1) inserting the sensor and a corrosion-resistant electrode into the metal melt, and making sure that the solid proton conductor element is fully immersed into the metal melt, the quasi-electrode to be measured is in direct contact with the metal melt and the contact surface is the electrode to be measured; (2) connecting a potentiometer and the reference electrode cable or the metal gas guide pipe to the corrosion-resistant electrode, and measuring a potential difference between the reference electrode and the electrode to be measured; and (3) calculating the hydrogen content S of the metal melt according to the measured potential difference, a temperature of the metal melt and a saturated solubility of hydrogen in the metal melt.

21 . The sensor for measuring hydrogen content in metal melt according to claim 12 , wherein the sensor comprises a reference electrode cable, wherein when the reference compound is liquid or solid, the reference electrode cable penetrates through the insulating ceramic adhesive, is connected with the reference electrode and is externally connected to a measuring circuit, and the reference electrode cable is metal platinum, gold, silver, nickel-chromium alloy, iron-chromium-aluminum alloy or stainless steel.

Assignees

• Univ Northeastern

Inventors

• Li Ying
• Ding Yu Shi

Classifications

• G01N27/301

  Reference electrodes · CPC title

• G01N33/005

  H2 · CPC title

• G01N33/2025

  Gaseous constituents · CPC title

• G01N27/30

  Electrodes, e.g. test electrodes; Half-cells (G01N27/414 takes precedence) · CPC title

• G01N27/4114 Primary

  for detection of gases other than oxygen · CPC title