Cast (self-flow) ceramic castables. 1. Fabrication and some properties of cast silica ceramic castables

A classification of methods for manufacturing cast (without the use of vibration) ceramic castables is suggested and the mechanism of their structure formation is formulated. Cast (self-Row) castable mixtures with a moisture content of 4.8 - 5.5% are developed based on HCBS of quartz sand and a polydisperse silica filler (d(max) = 1 - 7 mm). The mixtures are used to cast ceramic castables with an open porosity of 11 - 16%. After drying and heat treatment at 1200 and 1300 degrees C their ultimate compressive strength is 6 - 14, 20 - 35, and 60 - 120 MPa, respectively. As compared with similar pressed and rammed ceramic castables: cast ones are characterized by a lower porosity and a substantially higher strength.