共和国
发表于 2025-3-28 18:05:30
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Infelicity
发表于 2025-3-28 20:21:57
Surface Treatment of Metallic Vacuum Tube Elements,moved by etching either with acid or alkalies according to the type of material to be cleaned. Grease is removed by use of suitable solvents. The choice of type of cleaning depends considerably upon the degree and nature of impurities, the chemical properties of the piece to be cleaned and the subsequent operational demands on it.
endoscopy
发表于 2025-3-28 23:45:54
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最高峰
发表于 2025-3-29 06:22:07
General Structure and Properties of Materials (Including Metallographic Methods), evolved throughout this process increases with the outgassing temperature. Generally no further gas should be evolved from the parts contained in the tube structure provided that the temperature attained in the exhaust process is greater than that attained throughout the operational life of the tube.
laceration
发表于 2025-3-29 10:38:10
Alloys of Base Metals,c. 14.5). For vacuum technique the following are of chief importance: Fe alloys with .; . alloys with ., and .; and . alloys with ., and .. Concerning alloys of base metals with high melting metals, see sec. 3.6 and sec. 5.6.
Neutropenia
发表于 2025-3-29 13:38:06
Working and Pre-Outgassing of Metallic Vacuum Tube Parts,eases and oils as much as possible, particularly during rolling and deep drawing. The material must be washed before each necessary intermediate annealing and such annealing should take place in a hydrogen atmosphere or in vacuum.
愉快么
发表于 2025-3-29 18:32:06
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Flirtatious
发表于 2025-3-29 20:36:09
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绅士
发表于 2025-3-30 02:32:21
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WITH
发表于 2025-3-30 05:54:23
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