. The Bell System technical journal . tal. In this treatment,other carbides are added as required. Following the milling operation,the mixed powders are pressed in suitable molds and given a pre-sinteringheat treatment to increase the strength for handling and to remove, byvolatilization, lubricants which may have been used to facilitate the pre-sintering operation, the compact can be cut to desired shapesquite readily. The sintering treatment which follows is carried out atabout 1400°-1500° C. with the pressed parts placed in carbon boats oron carbon slabs and heated in a suita
. The Bell System technical journal . tal. In this treatment,other carbides are added as required. Following the milling operation,the mixed powders are pressed in suitable molds and given a pre-sinteringheat treatment to increase the strength for handling and to remove, byvolatilization, lubricants which may have been used to facilitate the pre-sintering operation, the compact can be cut to desired shapesquite readily. The sintering treatment which follows is carried out atabout 1400°-1500° C. with the pressed parts placed in carbon boats oron carbon slabs and heated in a suitable neutral or reducing is considerable shrinkage in dimensions in this sintering treatmentwhich gives a product that is hard, dense, sound, and strong. Any furthershaping is done by grinding or lapping operations. The cemented carbides have many uses usually falling into the threegeneral classes of die materials, cutting tool materials, and wear and cor-rosion resistant materials. 438 BELL SYSTEM TECHNICAL JOURNAL.
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