ARTIFICIAL CORUNDUM MATERIAL
Uses of Artificial Sapphire
The synthetic corundum is an ideal monocrystal material. It has advantages of heat-resisting
and anti-radiation besides its good mechanical, electrical and optical properties, and therefore are
widely used for jewel bearings in instruments and meters and for wear-resisting components in precision machinery. It is also suitable to make orifice jewels, that are useful for synthetic fibre, dye
and food industries, infrared-ray-transmitting windows, bases for IGFET (insulated-gate field-
effect-transistor), output windows for high power microwave tube, substrates for IC (integrated circuit), etc.
Uses of Synthetic RubyRuby can be used for orifice jewels, insulators and laser working-material, as well as for jewel
bearings in instruments and timepieces and for wear-resisting parts in precision machines.
Uses of Natural AgateAgate can be used for bearings in instruments, knife-edge of balances. Also it can be
manufactured as ornament.
1. The angle between 60o-75o for sapphire; growth and optical axes: 55o-65o for ruby.
2. Corundum should be strictly inspected according to the standard concerned; any blisters,
impurity and cracks within the material are not allowed.
3. The sapphire boule have the length from 40-60mm, and the diameter from 18-23
TECHNICAL DATA OF CORUNDUM
|Hole ring stone||Jewel packing ring|
|Sapphire insulator||Jewel thread guide|
|Agate bearing with conical recess||Pen point|
|Jewel measuring-head||Corundum contact tip|
|Corundum ball||Y-shape molybdum wire positioner|
||Mohs' scale number, 9
Microhardness, HV>=5691 N/mm2
||Not attacked by acids or by NaOH at normal temperature.
Attacked by HF at temperature of 300oC
||Coefficient of dry friction on steel, 0.14
||1X1016¦¸/cm(25oC); 1X1011¦¸/cm(500oC); 1X106¦¸/cm(100oC)
|Breakdown field strength
|Coefficient of expansion
||¡Íc: 6.5X10-6oC-1(50oC); 9X10-6oC-1(1000oC)
¡Îc: 3X10-6oC-1(50oC); 8.3X10-6oC-1(1000oC)
||33w/MooC(20oC); 25w/MooC(100oC); 8.4w/MooC(700oC)
|Index of refraction
||¡Îc:1.769; ¡Íc: 1.760 (¦Ë=5893¬þ)
|Transmission of infrared rays
||Larger than 85%
||After the accumulated radiation of 1012 protons/cm2, no change in transmissivity below 3000¬þ
1. Olive hole ring stone with one recess|
Applicated in precision timers, automatic recorders, precision
measuring tools and other instruments as cylinder supports.
D: 1.2-3.2mm; H; 0.30-1.2mm; d:0.20-1.2mm.
2. End Stone|
Applicated in varieties of precision measuring tools, hydralicy76
gauges and other instruments and meters as end supports in
their moving mechanism.
D: 1.0mm-5.omm.; H: 0.25-0.50mm.
3. Jewel with spherical recess|
Applicated in the moving mechanisms of the electrical in-
struments and meters, heat engineering meters and single-
phase and three-phase watt-hour meters.
D: 1.8-5.0mm; H:1.2-3.0mm; h:0.30-0.50mm; R:0.65-3.00mm.
4. Agate bearing with conical recess|
Applicated in the moving mechanisms of electrical, heat en-
gineering, aviation, navigation and meteorological instruments
D: 1.0-2.5mm; H:0.8-2.5mm; h:0.30-0.6mm.
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