Macor glasses

Mach-Zehnder interferometer, 22 153 Mackenzie-Shuttleworth model, 23 75 Mackie line effect, 19 209, 210 Macor glass-ceramic, 22 635 Macquartite, 6 471t Macrinite, 6 707t Macrobicyclic effect, 24 39 Macrocrystalline wax, 26 214 Macrocycles, 24 35, 45 developments of, 24 36 Macrocyclic complexes, rhodium, 29 645 Macrocyclic compounds, chelating agents, 5 710, 713t... 

Baumann has also made heat flux measurements using thermographic phosphors.Wind tunnel models made of three different materials (steel, Macor glass ceramic, and Norcoat 4000 silicone elastomer), all of which had thin coatings of Y202S Eu (0.15%) applied, were monitored during blow-down tests in a hypersonic flow facility. The response time of the measurement system was typically less than 200 msec, and the values of the heat flux measurements obtained with... 

MACOR glass-ceramics make excellent insulators. They are widely used to manufacture equipment for vacuum technology. Compared with sintered ceramics, glass-ceramics are pore-free. 

This wide spectrum of application as a high-performance material demonstrates the importance of MACOR glass-ceramics in technology and medicine. Further potential applications must be considered. 

Figure 4-3 Selected properties of MACOR glass-ceramic (MACOR 1992).

Figure 4-4 Examples of the uses of MACOR glass-ceramics.

Figure 1. Diagram of Teflon cell (1) platinum electrode (2) glass scintillator (3) Macor ceramic disk cell bottom (H) Teflon O-ring (5) flexible elbow (see insert) (6) cell ports (six of them around cell body) (7) light pipe. Inset shows the details of the flexible elbow (8) stainless steel sphere (9) concave Teflon spacer (10) platinum wire for electrical connection across elbow (11) lock nut.

Figure 2. Diagram of electrode in adsorption position and "squeezed" position for adsorbate measurement (1) smooth, polycrystalline platinum electrode (2) polished glass scintillator detector (3) Macor ceramic disk, which forms cell bottom ( )) resin (5) electrode shaft.

Macor is the trade name of a rnachineable glass manufactured by Corning Glass, NY 10000. U is a good insulator and compatible with ultra-high vacuum. 

For use over a wide temperature range, it is necessary to match the thermal expansion coefficients of electrode and insulation sheath. RRDEs of glassy carbon embedded in borosilicate glass for use up to 450° C [123] and gold sputtered on to a chromium or titanium substrate on a Macor ceramic cylinder for use up to at least 125°C [124] are examples. 

The glass plates were sandwiched between two polished alumina flats so that weights could be applied on top, and the glass surfaces would remain smooth after thermal bonding [105]. To ensure even heat distribution, the two bonding plates were sandwiched between two Macor ceramic plates [139]. 

The high-speed magic-angle spinner used has been described in detail elsewhere (5). The particular one we used is constructed of Macor, a machineable glass that gives no background in the 13C CP/MAS spectra. Additional experimental details and a discussion relating this procedure to solid coals and coal derived liquids have been previously published (8). 

Fig. 8 A scanning electron microscope micrograph of microwave-joined MaCor and hydroxyapatite, joined at 1020°C for 20 min in a single-mode 2.45 GHz microwave cavity. (MaCor is a mica-platelet reinforced glass ceramic and HAP is a bioceramic material.) (From Ref. f Reprinted with permission of The American Ceramic Society, www. ceramics.org. Copyright 2003. All rights reserved.)...

Brittle fracture is used for shaping and machining ceramics after they have been fired. Ceramics can be modified to make them machinable this is controlled fracture and is the approach we adopt with machinable glass-ceramics such as Macor (Chapter 26). Of course, many ceramics already are machinable and can be shaped into intricate and beautiful forms as illustrated in the carved marble sculpture shown in Figure 18.1. 

Final machining using Vycor (the cor is from Corning), Macor, or similar specially treated glasses. (Vycor contains built-in pores Macor contains small grains of mica.)... 

The material chosen as a test material is MACOR. MACOR is a machinable glass ceramic and is a fluorine rich glass with a composition approaching trisilicic fluorphlogopite mica (KMg3AlSi30ioF2) (6). The material was acquired in a rod form. 

Machinable glass-ceramics are based on internally nucleated fluoromica crystals in glass (Beall 1971a). One commercial material has been marketed for 20 years under the trademark MACOR and has found wide application in such diverse and speciality areas as precision electrical insulators, vacuum feedthroughs, windows for microwave-type parts, samples holders for field-ion microscopes, seismograph bobbins, gamma-ray telescope frames, and... 

Mica-type glass-ceramics are very good insulators. MACOR is a preferred glass-ceramic for this appHcation. Its properties and microstructure were reported in Sections 2.3.1 and 3.2.6. 

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