Abstract
Machining KDP crystal with an ultra-smooth surface is a key subject in the field of modern ultra-precision machining. The variations in hardness and fracture toughness of different orientations on the (001) plane of KDP crystal are studied by means of Vickers indentation. Through establishing a model of critical cutting depth during the occurrence of brittle-ductile transition of KDP crystal, the mechanism of brittle-ductile transition of KDP crystal is studied. The study shows that the minimum critical turning thickness of brittle-ductile KDP transition appears in orientation [110] with minimum fracture toughness and maximum hardness. The maximum critical turning thickness of brittle-ductile KDP transition appears in orientation [001] with maximum fracture toughness and minimum hardness. The KDP crystal is machined by an ultra-precision machine tool. Experimental results are consistent with theoretical conclusion. An ultra-smooth surface with surface roughness of 7.5 nm (RMS) is machined in orientation [001].
| Original language | English |
|---|---|
| Pages (from-to) | 67-70+88 |
| Journal | Guangdian Gongcheng/Opto-Electronic Engineering |
| Volume | 32 |
| Issue number | 7 |
| State | Published - Jul 2005 |
Keywords
- Diamond cutting
- Fracture toughness
- KDP crystal
- Ultra-precision manufacture
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