Inspection and Image Analysis of Nickel Sulphide Inclusions in Toughened Glass Panels
Nickel sulphide is a kind of detrimental inclusion in toughened glass panels. Once the critical conditions are satisfied, the inclusion will cause the shattering of glass panels. An inspection tool was developed for rapid detection of inclusions. More than one thousand pieces of glass were inspected and seventeen of them were found with inclusions. With the experiment of heat soak, and analysis of dispersive energy spectrum, the appearance of nickel sulfide inclusion was presented, which can be used as guidance of in-line inspection of glass panels. The optical system was improved to get clear image of inclusions inside glass panels. Auto focus technique was used to measure the depth of inclusions, which can provide a parameter for the categorization of inclusions
A fracture mechanics description of the microcracking about NiS inclusions in glass
Abstract It is well known that the presence of NiS inclusions in thermally tempered glass bodies may lead to catastrophic fragmentation of the body. This phenomenon occurs because of the 4% volumetric expansion associated with the α-β phase transformation in NiS on cooling. A simple generalised fracture mechanics analysis of both microcracking about NiS inclusions in annealed glass and the spontaneous fragmentation of thermally tempered glass is developed. The critical dimensions of NiS inclusions for both phenomena are predicted. In the case of fragmentation both the level of tempering and the position of the inclusion within the tempered body are important. Observations confirm the essential features of the analysis.
Light scattering and ir measurements in XS2 pryite‐type compounds
The results of Raman scattering and reflectivity measurements of XS2 (X=Fe, Co, Ni, Cu, Zn) transition metal dichalcogenides are reported. These compounds are expected to exhibit five Raman‐active and five ir‐active q?0 optical phonons in first‐order processes. Measurements of light scattering at T?300 °K revealed at most three phonon modes for the above materials (with the exception of powdered ZnS2). Some overtone scattering was also observed. Measurements of far infrared reflectivity did not yield the frequencies of all five ir‐active phonons expected. The results of mixed crystals are also discussed.