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High-pressure combinatorial process integrating hot isostatic pressing.

Kenjiro Fujimoto1, Hiroki Morita, Yuji Goshima

  • 1Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science , Yamazaki 2641, Noda, Chiba 278-8510, Japan.

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Summary
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A new high-pressure reaction vessel enables hot isostatic pressing (HIP) up to 200 MPa and 500 °C. This method successfully synthesized single-phase spinel-type magnesium aluminum oxide (MgAl2O4) powders.

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Area of Science:

  • Materials Science
  • High-Pressure Synthesis
  • Ceramics

Background:

  • Developing advanced materials requires precise control over synthesis conditions.
  • Hot isostatic pressing (HIP) is a crucial technique for densification and synthesis of materials.
  • Existing high-pressure equipment can be limited in terms of pressure, temperature, or versatility.

Purpose of the Study:

  • To develop a novel high-pressure reaction vessel for combinatorial material synthesis.
  • To demonstrate the capability of the developed system for synthesizing spinel-type magnesium aluminum oxide (MgAl2O4).
  • To establish a robust method for producing high-quality ceramic powders under extreme conditions.

Main Methods:

  • A high-pressure reaction vessel with enhanced sealing was designed and fabricated using a commercial flange.
  • The system was tested under hot isostatic pressing (HIP) conditions up to 200 MPa and 500 °C.
  • Spinel-type MgAl2O4 was synthesized from hydroxide and oxyhydroxide precursors (Mg(OH)2, Al(OH)3, AlOOH) within the developed vessel.

Main Results:

  • The reaction vessel demonstrated high-pressure tightness suitable for HIP processing up to 200 MPa and 500 °C.
  • Single-phase spinel-type MgAl2O4 was successfully synthesized using Mg(OH)2 and Al(OH)3 precursors under 200 MPa and 500 °C.
  • Powder X-ray diffraction confirmed the formation of the desired single-phase spinel structure, consistent with literature data.

Conclusions:

  • A versatile high-pressure reaction vessel integrating HIP was successfully developed.
  • The system enables the synthesis of high-quality spinel-type MgAl2O4 powders under demanding conditions.
  • This technology offers a promising route for combinatorial materials discovery and synthesis.