title: Effects of phase transformations of silicas and calcium sulfates on the compressive strength of gypsum-bonded investments at high temperatures.
abstract: The effects of transformations of silicas and calcium sulfates on high temperature compressive strength were investigated in commercial and experimental investment materials containing fused quartz as silica. The strength is only slightly affected by the alpha leads to beta transformation of cristobalite and not by the quartz alpha leads to beta transformation. The state of the calcium sulfates is the main factor influencing variations in the strength at a particular temperature.
mesh_terms: D002133:Calcium Sulfate; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003734:Dental Casting Investment; D006358:Hot Temperature; D011791:Quartz; D012822:Silicon Dioxide; D013314:Stress, Mechanical; D013816:Thermodynamics; D013997:Time Factors; D014961:X-Ray Diffraction
chemical_list: D003734:Dental Casting Investment; D011791:Quartz; D012822:Silicon Dioxide; D002133:Calcium Sulfate