Fatigue Properties of Cast Ag-Pd-Cu-Au-Zn Alloy for Dental Applications in the Relation with Casting Defects

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Ag–Pd–Cu–Au–Zn type alloys have been widely used as dental prosthetic materials. In general, the dental prosthetic products are fabricated by a dental casting method. The dental castings contain the casting defects such as micro shrinkages, pores, surface roughness, <I>etc.</I> Cyclic stress, that is, fatigue stress due to the mastification is applied to the dental prosthesis in the practical use. Therefore, the effects of the casting defects such as micro shrinkages, pores and surface roughness on the fatigue properties of the cast Ag–Pd–Cu–Au–Zn type alloy were investigated in the comparison with the fatigue properties of the drawn Ag–Pd–Cu–Au–Zn alloy in this study. Fatigue tests of Ag–Pd–Cu–Au–Zn alloy cast using a dental casting machine were carried out, and then the fatigue properties of the cast alloy were investigated in the relation with casting defects. The fatigue strength of the cast Ag–Pd–Cu–Au–Zn alloy is considerably smaller than that of the drawn Ag–Pd–Cu–Au–Zn alloy. The fatigue crack of the cast alloy initiates preferentially at the shrinkage near the specimen surface. The scatter of the fatigue strength of the cast alloy becomes to be small by relating the fatigue life with the maximum stress intensity factor calculated assuming the shrinkage that becomes to be a fatigue crack initiation site as a initial crack. This means that the size of the shrinkage affects the fatigue strength of this cast alloy strongly. The tolerant size of the shrinkage that satisfies the target value of the fatigue limit (230 MPa) of this cast alloy is calculated to be below 80 \\micron using the equation derived in this study, which describes the relationship between the maximum stress intensity factor and the number of the cycles to failure.

収録刊行物

  • Materials transactions

    Materials transactions 43(12), 3160-3166, 2002-12-01

    日本金属学会

参考文献:  14件中 1-14件 を表示

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各種コード

  • NII論文ID(NAID)
    10012329360
  • NII書誌ID(NCID)
    AA1151294X
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    13459678
  • NDL 記事登録ID
    6395436
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z53-J286
  • データ提供元
    CJP書誌  CJP引用  NDL  IR  J-STAGE 
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