GB1351091A - Thermal analysis method and a-paratus - Google Patents
Thermal analysis method and a-paratusInfo
- Publication number
- GB1351091A GB1351091A GB2335272A GB2335272A GB1351091A GB 1351091 A GB1351091 A GB 1351091A GB 2335272 A GB2335272 A GB 2335272A GB 2335272 A GB2335272 A GB 2335272A GB 1351091 A GB1351091 A GB 1351091A
- Authority
- GB
- United Kingdom
- Prior art keywords
- points
- temperature
- signals
- variables
- inflection
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/02—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/12—Dippers; Dredgers
- G01N1/125—Dippers; Dredgers adapted for sampling molten metals
Abstract
1351091 Thermal analysis GENERAL MOTORS CORP 18 May 1972 [27 May 1971] 23352/72 Heading G4A The metallurgical properties of a sample of molten cast-iron treated to form nodular castiron on solidification are predicted by (a) measuring the temperature of the sample at predetermined increments of time during an interval in which the sample cools from a liquid to a solid to determine a cooling curve, (b) storing the measurements in an electronic digital computer, (c) differentially analysing the measurements to determine (1) a first set of signals corresponding to the points of inflection of the cooling curve and (2) a second set of signals corresponding to points of minimum radius between the points of inflection and (d) storing the two sets of signals in matrix form as a function of independent variables such as absolute time and temperature. Known matrices obtained in similar manner from samples having known properties are correlated using regression analysis to determine the independent variables required to predict particular properties, these variables then being operated on to make predictions for the unknown sample. A sampling device (see Division H1) for determining the cooling curve includes a thermocouple assembly the output leads from which are coupled to a digital computer which stores the measured temperatures. The inflection points represent the temperatures at which the heat of solidification given by the samples are either a maximum or a minimum. They are computed by examining the first five measurements to determine the slope of the curve at the third measurement point, this process then being repeated for the second to sixth samples, &c. The maximum and minimum slopes are then selected to identify the points of inflection to derive the first set of signals. The points of minimum curve radius are computed by finding the minima of the equation where T is temperature; t is time to derive the second set of signals. These signals are stored in matrix form as functions of absolute time, temperature, temperature decay rate, curve radius and time and temperature differentials. Known matrices obtained in like manner from similar samples with known properties are correlated by a series of regressive analyses of the form where Y is the property to be predicted, A 0 is a constant dependent on this property, A 1 -A j are numerical coefficients and X 1 -X j are the stored independent variables selected by operating successively with each independent variable as X 1 to determine which gives the best prediction of the known property and then trying the remainder of the variables as X 2 &c. Predictions for the unknown sample are then effected by using the stored variables as the appropriate independent variables X i .
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14735671A | 1971-05-27 | 1971-05-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1351091A true GB1351091A (en) | 1974-04-24 |
Family
ID=22521238
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2335272A Expired GB1351091A (en) | 1971-05-27 | 1972-05-10 | Thermal analysis method and a-paratus |
Country Status (6)
Country | Link |
---|---|
AU (1) | AU4221572A (en) |
BR (1) | BR7203167D0 (en) |
CA (1) | CA996272A (en) |
DE (1) | DE2225766A1 (en) |
GB (1) | GB1351091A (en) |
IT (1) | IT969396B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2259937A1 (en) * | 2005-04-15 | 2006-10-16 | Casa Maristas Azterlan | Method for determining the trend to the rechupe of a spherical grafitic foundry. (Machine-translation by Google Translate, not legally binding) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4433685C2 (en) * | 1994-09-21 | 1997-02-13 | Heraeus Electro Nite Int | Sensor arrangement for temperature measurement, temperature measuring device and method |
DE102013100686B3 (en) * | 2013-01-24 | 2014-05-15 | Netzsch - Gerätebau Gesellschaft mit beschränkter Haftung | Method for performing a differential thermal analysis |
DE102019117131A1 (en) * | 2019-06-25 | 2020-12-31 | ZORC Technology GmbH | Arrangement and method for the physical-metallurgical analysis of melts |
-
1972
- 1972-05-10 GB GB2335272A patent/GB1351091A/en not_active Expired
- 1972-05-12 AU AU42215/72A patent/AU4221572A/en not_active Expired
- 1972-05-18 CA CA142,476A patent/CA996272A/en not_active Expired
- 1972-05-18 BR BR316772A patent/BR7203167D0/en unknown
- 1972-05-22 IT IT5041072A patent/IT969396B/en active
- 1972-05-26 DE DE19722225766 patent/DE2225766A1/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2259937A1 (en) * | 2005-04-15 | 2006-10-16 | Casa Maristas Azterlan | Method for determining the trend to the rechupe of a spherical grafitic foundry. (Machine-translation by Google Translate, not legally binding) |
Also Published As
Publication number | Publication date |
---|---|
BR7203167D0 (en) | 1973-06-14 |
DE2225766A1 (en) | 1972-12-07 |
AU4221572A (en) | 1973-11-15 |
CA996272A (en) | 1976-08-31 |
IT969396B (en) | 1974-03-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |