2results about How to "High green strength" patented technology

The utility model discloses an aluminum oxide ceramic sealing test standard part green body dry pressing forming die which comprises a variable-diameter cylindrical positioning rod fixing die, a variable-diameter cylindrical positioning rod, a circular ring inner concave petal die, a cylindrical outer die, a circular ring gasket die, a circular ring column ejector rod and a die withdrawing groove. The variable-diameter cylindrical positioning rod fixing mold is used for fixing, supporting and positioning the variable-diameter cylindrical positioning rod; the variable-diameter cylindrical positioning rod has the functions of positioning, blank inner supporting and filler guide mold; the circular ring inner concave petal die consists of two petal dies and is positioned through a variable-diameter cylindrical positioning rod and a cylindrical outer die; the circular ring gasket die is positioned by a variable-diameter cylindrical positioning rod and a cylindrical outer die; the ceramic blank is filled between the circular ring inner concave petal die and the circular ring gasket die; the annular column ejector rod is positioned through the variable-diameter cylindrical positioning rod and the cylindrical outer mold; and demolding through the demolding groove. The forming die disclosed by the utility model can realize dry-pressing forming and convenient demolding of special-shaped ceramic green bodies, is simple and convenient to operate, and the obtained green bodies are high in strength and small in firing shrinkage.

This invention discloses a method for preparing yttrium-magnesium oxide (YMO) multiphase transparent ceramics using non-aqueous gel casting, belonging to the field of ceramic preparation technology. To overcome the problems associated with water-based gel casting, this invention provides a method for preparing YMO multiphase transparent ceramics using non-aqueous gel casting, comprising: ball milling Y2O3, MgO, a dispersant, and a non-aqueous solvent; then adding epoxy resin and a curing agent and ball milling again; the resulting ceramic slurry is defoamed, cured, and dried; then subjected to debinding, sintering densification, cooling, hot isostatic pressing, annealing, and polishing to obtain the YMO multiphase transparent ceramic. This invention overcomes the difficulties in preparing large-size Y2O3-MgO nano-multiphase infrared transparent ceramics and the problem of component inhomogeneity by designing a non-aqueous solvent system and selecting a suitable gel system, and can produce complex-shaped / large-size, uniformly composed YMO nano-multiphase ceramics.