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178 results about "Critical surface" patented technology

Critical surface tension. According to the Zisman method, the critical surface tension is the surface tension at which a liquid just completely wets a solid. The surface tension of different liquids is plotted against the cosine of the contact angle θ in order to determine the critical surface tension.

Mold shell for precision casting or directional solidification of TiAl-based alloy and method for manufacturing mold shell

The invention belongs to the technical field of manufacturing of precision investment casting mold shells, and relates to a mold shell for precision casting or directional solidification of a TiAl-based alloy and a method for manufacturing the mold shell. In slurry of a surface layer and a critical surface layer of the mold shell involved in the method, alumina sol serves as a binder, and high-purity electric smelting yttrium oxide powder and electric smelting white corundum powder serve as fireproof filler; and at least one of Y2O3 and three kinds of yttrium-aluminum oxide, namely, Y3Al5O12, Y4Al2O9 and YAlO3, serves as ingredients of the surface layer of the mold shell obtained after roasting. The mold shell is manufactured through the precision investment casting technology, and the procedures of mold waxing, slurry hanging, sand spreading, dewaxing, roasting and the like are included. The slurry of the mold shell is stable in performance, good in smearing, hanging and flowing performance and easy to store; the mold shell has the beneficial effects of being high in chemical stability, excellent in high-temperature strength, thermal shock resistance and high-temperature creep resistance and the like; and the TiAl-based alloy obtained through precision casting or directional solidification is smooth in surface, and a pollution layer is thin.
Owner:BEIJING UNIV OF TECH

Sectional type ground temperature gradient fitting method based on stratigraphic unconformity surface

InactiveCN105652342AAccurate responseOvercoming the problem of insufficient ability to identify ground temperature anomaliesDetection/prospecting using thermal methodsComplex mathematical operationsGround temperatureEngineering
The invention discloses a sectional type ground temperature gradient fitting method based on a stratigraphic unconformity surface. The method comprises the steps of: 1) determining the distribution and burial depth of the stratigraphic unconformity surface, obtaining temperature measurement data, and drawing a ground temperature curve with the temperature and the burial depth respectively serving as a transverse coordinate and a longitudinal coordinate; 2) in the range of 0-100 m downward from the stratigraphic unconformity surface, selecting the most bending part of the ground temperature curve as a ground temperature gradient critical surface, and dividing the ground temperature curve into an upper cure and a lower curve; 3) carrying out linear fitting respectively on temperature measurement data corresponding to the upper curve and the lower curve, and obtaining an upper straight line and a lower straight line, wherein the gradients thereof are respectively the ground temperature gradients of a shallow stratum and a deep stratum and reflect the practical ground temperature field of a temperature measurement well area. The method is characterized in that according to the development characteristics of stratums in different areas, the ground temperature gradients above and below the ground temperature gradient critical surface are independently fitted, so that the ground temperature gradients of upper and lower stratums are obtained, the ground temperature field characteristics of new and old stratums are really reflected, and a reliable basis is provided for oil and gas and geothermal resources exploration, development and utilization.
Owner:CHINA PETROLEUM & CHEM CORP +1
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