アルミナ溶射皮膜の強度評価 : 第2報,き裂の干渉判定条件及びき裂形状補正法の提案(<小特集>電子機器の熱・機械信頼性と機械工学)

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  • Strength Evaluation of Alumina's Spray Coating : 2nd Report, Proposal for Judgments of Crack Interference and Correction Methods of Crack Shape(<Special Issue>Thermal and Mechanical Reliability of Electronic Device and Mechanical Engineering)
  • アルミナ溶射皮膜の強度評価(第2報)き裂の干渉判定条件及びき裂形状補正法の提案
  • アルミナ ヨウシャ ヒマク ノ キョウド ヒョウカ ダイ2ホウ キレツ ノ カンショウ ハンテイ ジョウケン オヨビ キレツ ケイジョウ ホセイホウ ノ テイアン

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Alumina's spray coating is material including a lot of pores (cracks) and cracks interference exists in the alumina's spray coating, therefore the crack's interference leads to decrease the fracture strength. There are some reports to analyze by using the elastic analysis for two or more cracks. Moreover, there are some standards about union condition of the cracks. However in ceramics including alumina, the study of quantifying an internal spread of the crack when interfering and presuming static fracture strength with judgment of the crack interference after the stable crack propagation is hardly known. In this report, after the alumina's spray coating single layer is taken out, Vickers indentation crack is introduced, 4-point bending test is performed and R-curve is acquired. As a result, the fracture strength characteristic of the alumina's spray coating single layer is clarified. Then, three judgments of the crack interference with the R-curve are proposed. Moreover, correction methods of crack shape when the cracks interfere are proposed. The validities of the proposals are verified with bending tests after two Vickers indentation cracks have been introduced.

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