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Related Experiment Videos

Titanium casting into phosphate bonded investment with zirconite.

X-P Luo1, T-W Guo, Y-G Ou

  • 1Department of Prosthodontics, Nanjing Stomatological Hosptial, School of Medicine, Nanjing University, 30 Zhongyang Road, Nanjing 210008, China. lj961016@public1.ptt.js.sn

Dental Materials : Official Publication of the Academy of Dental Materials
|August 23, 2002
PubMed
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Using zirconite investment reduced the titanium casting reaction layer thickness. This resulted in smoother, crack-free titanium surfaces that were easier to clean.

Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Casting Technology

Background:

  • Titanium castings are widely used in dentistry and medicine.
  • Controlling the surface reaction layer is crucial for biocompatibility and mechanical properties.
  • Traditional casting methods can result in thick, detrimental surface layers.

Purpose of the Study:

  • To investigate the effect of zirconite inner investment on the surface reaction layer of titanium castings.
  • To analyze the micro-hardness, structure, and elemental distribution of the reaction layer.
  • To evaluate the impact of zirconite investment on casting surface quality.

Main Methods:

  • Utilized a new centrifuge-vacuum-pressure cast titanium machine.
  • Employed Knoop's hardness testing to measure micro-hardness.

Related Experiment Videos

  • Analyzed reaction layer structure and elemental distribution using Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS).

    • Main Results:

    • Zirconite investment significantly reduced the reaction layer thickness (<35 microm) compared to phosphate investment (>50 microm).
    • Titanium castings made with zirconite exhibited lower surface micro-hardness.
    • The reaction layer structure consisted of sintering, alpha-Case, Si-rich, and acicular crystal layers with distinct elemental distributions.

    Conclusions:

    • Coating wax patterns with zirconite effectively reduces the reaction layer thickness on cast titanium.
    • Zirconite investment leads to smoother, crack-free titanium casting surfaces.
    • The investment material on the titanium surface is easily removed when using zirconite.