Solar Manufacturing of Telford, PA has received new orders for two (2) energy efficient hot zones from Solar Atmospheres Inc. of Souderton, PA. The hot zones will be constructed with high purity, low shrinkage graphite felt insulation, a Flex Shield hot face and improved gas quench nozzle technology for rapid cooling.
In a continuing effort to maximize hot zone insulation efficiency and reduce energy costs, Solar Atmospheres has ordered the hot zones for their two largest vacuum furnaces in their Souderton facility. One furnace has a work zone size of 54” X 54” X 120” deep and the other 54” X 54” X 144” deep. Each were originally constructed with four (4) layers of ½” carbon felt and a 0.045” thick graphite foil hot face. The new energy efficient hot zones are expected to further reduce the watts per square inch of power required (from 6.24 to 4.0 wpsi at 2400°F) as well as extend hot zone life (five or more years operating 24/7/365).
The new hot zones will utilize five (5) layers of ½” thick WDF grade graphite felt insulation and 0.047” thick Flex Shield. WDF grade graphite felt does not shrink therefore it maintains its high thermal value throughout its useful life. In addition, it does not absorb water vapor at 90% relative humidity therefore providing the best vacuum pump down speeds obtainable with an insulated hot zone. Flex Shield is a durable, flexible, graphite material that provides the reflectivity of graphite foil and the durability of carbon fiber-reinforced material. The use of Flex Shield allows for replacement of a graphite board hot face with more thermally efficient graphite felt.