Porous W with controlled pore structure was fabricated by thermal decomposition and hydrogen reduction process of PMMA beads and WO₃ powder compacts. The PMMA sizes of 8 and 50 μm were used as pore forming agent for fabricating the porous W. The WO₃ powder compacts with 20 and 70 vol% PMMA were prepared by uniaxial pressing and sintered for 2 h at 1200°C in hydrogen atmosphere. TGA analysis revealed that the PMMA was decomposed at about 400°C and WO₃ was reduced to metallic W at 800°C. Large pores in the sintered specimens were formed by thermal decomposition of spherical PMMA, and their size was increased with increase in PMMA size and the amount of PMMA addition. Also the pore shape was changed from spherical to irregular form with increasing PMMA contents due to the agglomeration of PMMA in the powder mixing process.

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• Synthesis of Porous Silica Particles Using Sodium Silicate Precursor for Water-Repellent Surfaces
  Young-Sang Cho, Nahee Ku, Young-Seok Kim
  JOURNAL OF CHEMICAL ENGINEERING OF JAPAN.2019; 52(2): 194.     CrossRef