Back to results
US 5,033,320 AGranted
Device for determining phase transitions using a sample of molten metal
AssigneeElectro-Nite International N.V.
InventorChristiaan E. E. Baerts
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeElectro-Nite International N.V.
InventorChristiaan E. E. Baerts
Estimating the term…
A device to determine phase transitions by means of thermal analysis using a sample taken from molten metal comprises an expendable measuring probe with a solidification chamber into which the molten metal flows, whereby the solidification chamber contains a thermocouple with which the course of cooling is recorded over a specific time period. According to the invention, the side walls of the solidification chamber 3 comprise a metal casing 4 that completely surrounds the chamber and extends lengthwise of the measuring probe 1. Both open ends of the casing 4 are covered by plugs 5,6 made of a material whose heat conductivity is substantially less than that of the casing material. The casing is completely surrounded by a covering 2,8 which is made of a material whose heat conductivity is substantially less than that of the metal casing. The supply orifice for the molten metal comprises a quartz pipe 9 surrounded by a metal pipe 10. According to the invention, the mass of the casing 4, which results from its height (h) and the thickness of its walls (b), is proportioned so that the heat which is given off by the molten metal flowing into the solidification chamber and absorbed by the metal casing produces, in the area of the thermocouple, an equilibrium temperature which approximates the solidification temperature as closely as possible.
In a device for determining phase transitions by means of thermal analysis using a sample taken from molten metal, comprising of an expendable measuring probe with a solidifcation chamber having a supply orifice for the molten metal and a temperature-measuring means which extends into the chamber at the end located opposite the supply orifice and with which the cooling curve of the molten metal is determined over a specific time period, wherein the side walls of the solidifcation chamber running lengthwise in the probe at least partially comprise metal, the improvement comprising the simultaneous utilization of the following features:
A device according to claim I, wherein the supply orifice for the molten metal comprises a quartz pipe (9), which is covered on the outside by a slag cap (12) and is at least partially surrounded by a metal pipe (10) that is firmly set in the metal casing (4) of the solidification chamber (3), and wherein the quartz pipe is fastened to the metal pipe with refractory cement II.
Dependencies are inferred from the claim text.