发明授权
- 专利标题: Strengthening, crack arrest and multiple cracking in brittle materials using residual stresses
- 专利标题(中): 使用残余应力加强脆性材料的裂纹停止和多次开裂
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申请号: US09502284申请日: 2000-02-11
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公开(公告)号: US06516634B1公开(公告)日: 2003-02-11
- 发明人: David J. Green , Vincenzo M. Sglavo , Rajan Tandon
- 申请人: David J. Green , Vincenzo M. Sglavo , Rajan Tandon
- 主分类号: C03C1500
- IPC分类号: C03C1500
摘要:
Embodiments include a method for forming a glass which displays visible cracking prior to failure when subjected to predetermined stress level that is greater than a predetermined minimum stress level and less than a failure stress level. The method includes determining a critical flaw size in the glass and introducing a residual stress profile to the glass so that a plurality of visible cracks are formed prior to failure when the glass is subjected to a stress that is greater than the minimum stress level and lower than the critical stress. One method for forming the residual stress profile includes performing a first ion exchange so that a first plurality of ions of a first element in the glass are exchanged with a second plurality of ions of a second element that have a larger volume than the first ions. A second ion exchange is also performed so that a plurality of the second ions in the glass are exchanged back to ions of the first element.