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Grade matching applications on the sapphire

Sapphire's physical, chemical, and one of the most versatile materials that can manipulate the optical properties of the various types of Windows . Other mechanical applications , the use of less material in some applications, such as precision optical components seamlessly , allowing , however, require the highest level of quality .

Sapphire 's rating in order to optimize the application for the cost / performance ratio that requires the production of a window . You unnecessary costs or under specification of the window , if you do not improve performance , satisfactory results can lead to over- specification .

What are the different classes why ?

In general, alumina (α- alumina ) or aloxide natural sapphire , corundum, a mineral , or aluminum oxide (Al 2 O 3) referred to as one of nature's most abundant compound is the variety of jewelry . A white powdery substance that is widely used for industrial aluminum oxide abrasive nature . Approximately 2050 ° C ( almost 4000 ° F) when heated powder dissolution method using one of the many kinds of crystal growth can be formed from a single crystal .

Today the production of single crystal sapphire was invented in 1916, there are many ways , is a variation of the Czochralski process . In this process, a small sapphire seed crystal alumina decreased slowly withdrawing going to go , including a rise in the rate of melt per 100 ㎜ . Up to 400 mm diameter alumina , 500kg weight to make up long carrot -shaped boules of large size is determined at the end .

Almost perfect, but some of the other classes , incomplete property and other optical properties allow intentional or unintentional changes in the manufacturing process , however, can cause the sapphire . These qualities are a number of ways described below grade is

Sapphire What grade are you in?

Depending on grade sapphire optical quality , and physical characteristics. Synthetic sapphire single internationally recognized grading system used by the manufacturer , instead of synthetic sapphire optical or mechanical , or a particular application is not , what is important is graded by

In general, the Sapphire major sexual arethree:

Little or no light scattering or lattice distortion, primarily Sapphire • Advanced optics are used in the most demanding applications .

• (UV) ultraviolet light , medium, dark, sapphire is not exposed to UV light .

• wide distribution of light, or lattice distortion, and equipment such as these bearings , mechanical and structural applications, mainly in the low- grade sapphire can be used . Also available in a small optical applications requires

Sapphire Grade 5 , Grade 6 results for technical quality is considered to be one of the following , the optical quality is considered to be other commonly used rating system.

• 1 Grade: insert, block boundaries , twins, the number of micro- bubbles and is free of scattering centers .

• 2 Grade: insert, block boundaries, and the twins are free. Individual scattering centers (10mm longer each bubble without closing ㎛ < 10 location ) are allowed.

• 3 Grade: insert , block and twin boundaries are free. 10mm closer to each other than individual bubbles <20 μM are not allowed where .

• 4 Grade: insert, block boundaries, and the twins are free. Bubble < close to each other, well- bubble clusters (50 μm can include individual bubbles ) 10mm or less effective volume of 20x20x20 mm <200 scattered ㎛, such as the position of 2mm each other closer than 20 μm are not available.

• 5 Grade: insert , block and twin boundaries are free. Bubble <20 ㎛ close to each other than the itneunreul 2mm. Close to each other as well as bubble clusters (50 μm can include individual bubbles ) 5mm or less effective volume of 20x20x20 mm, scattered <500 μM are allowed.

• 6 Grade: insert , block and twin boundaries are free. Defects in bubble clusters in the region > 500 μM are allowed.

This technology , while allowing the two color optical grade ( 5-6 ), blue and green optical grade too (1-4) one of the two colors can be used.

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