CA2342297A1 - Molten metal inclusion sensor probes - Google Patents
Molten metal inclusion sensor probes Download PDFInfo
- Publication number
- CA2342297A1 CA2342297A1 CA002342297A CA2342297A CA2342297A1 CA 2342297 A1 CA2342297 A1 CA 2342297A1 CA 002342297 A CA002342297 A CA 002342297A CA 2342297 A CA2342297 A CA 2342297A CA 2342297 A1 CA2342297 A1 CA 2342297A1
- Authority
- CA
- Canada
- Prior art keywords
- passage
- molten metal
- flow
- machining
- sensor probes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000002184 metal Substances 0.000 title abstract 4
- 239000000523 sample Substances 0.000 title abstract 3
- 230000003750 conditioning effect Effects 0.000 abstract 2
- 238000003754 machining Methods 0.000 abstract 2
- 238000001514 detection method Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000000155 melt Substances 0.000 abstract 1
- 239000002245 particle Substances 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/10—Investigating individual particles
- G01N15/1031—Investigating individual particles by measuring electrical or magnetic effects
- G01N15/12—Investigating individual particles by measuring electrical or magnetic effects by observing changes in resistance or impedance across apertures when traversed by individual particles, e.g. by using the Coulter principle
- G01N15/13—Details pertaining to apertures
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/20—Metals
- G01N33/205—Metals in liquid state, e.g. molten metals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N2015/0042—Investigating dispersion of solids
- G01N2015/0053—Investigating dispersion of solids in liquids, e.g. trouble
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Continuous Casting (AREA)
- Investigating And Analyzing Materials By Characteristic Methods (AREA)
Abstract
The invention provides molten metal inclusion sensor probes having a sensing passage through which the molten metal passes, while a direct curren t path is established through the passage between two electrodes. The passage of an inclusion through a central sensing zone within the passage changes the electric resistance in the current path, resulting in a detectable pulse indicating its size, and enabling the number of particles in a sample to be counted. Previously the passage has been cylindrical, with or without a conical entrance to facilitate smooth flow, or of randomly smoothed profile produced by heating the materia l at the passage mouth until it melts and flows. The flowing metal produces a sel f- induced magnetic field and electromagnetic force that results in a "conditioning" flow when the current is above a threshold value. High levels of background noise making pulse detection difficult, and it is proposed to improve operation by machining the passage to decrease smoothly in flow cross section from its entrance to the sensing zone, preferably with a parabolic or elliptical profile. Preferably the exit has the same profile. Further improvement can be obtaine d by machining the wall surface to a smoothness of better than 1.016 micrometers (40 microinches). Such precise, smooth-walled passages facilitate the design of systems as to the optimum testing and conditioning currents required.</SDOAB >
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002342297A CA2342297C (en) | 2000-03-27 | 2001-03-26 | Molten metal inclusion sensor probes |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002302121A CA2302121A1 (en) | 2000-03-27 | 2000-03-27 | Liquid metal quality sensors |
| CA2,302,121 | 2000-03-27 | ||
| CA002342297A CA2342297C (en) | 2000-03-27 | 2001-03-26 | Molten metal inclusion sensor probes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2342297A1 true CA2342297A1 (en) | 2001-09-27 |
| CA2342297C CA2342297C (en) | 2006-12-05 |
Family
ID=25681663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002342297A Expired - Fee Related CA2342297C (en) | 2000-03-27 | 2001-03-26 | Molten metal inclusion sensor probes |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2342297C (en) |
-
2001
- 2001-03-26 CA CA002342297A patent/CA2342297C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2342297C (en) | 2006-12-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |