Chemical engineering . ejacket. Production of Molded Blocks, Tubes, etc., of Carborun-dum.—F. Boiling, 801,296, Oct. 10. Application filedMarch body of the desired form-is first made of pure carbonand then embedded in finely powdered silicon carbide (orboron carbide). By means of a firing process the bodyCor its surface) is converted info silicon carbide by ab-sorption. To prepare tubes of silicon carbide, a solid car-bon cylinder is treated in the manner described, wherebyan outer layer of silicon carbide is formed, and an innercore of carbon remains present, and is afterwards burntout b
Chemical engineering . ejacket. Production of Molded Blocks, Tubes, etc., of Carborun-dum.—F. Boiling, 801,296, Oct. 10. Application filedMarch body of the desired form-is first made of pure carbonand then embedded in finely powdered silicon carbide (orboron carbide). By means of a firing process the bodyCor its surface) is converted info silicon carbide by ab-sorption. To prepare tubes of silicon carbide, a solid car-bon cylinder is treated in the manner described, wherebyan outer layer of silicon carbide is formed, and an innercore of carbon remains present, and is afterwards burntout by keeping the tube at a red heat; the outer layer ofcarbide remains, since it is almost for Acids and Chemicals from Fused Quartz.—Edward Hart (assigned to General Chemical Co.). Oct. 10. .\pplication filed Dec. 4, \ mold A (of carbon or metal-lined with graphite) isformed of the desired shape and connected by the conduc-tor B with one pole of the source of electric current. A. -ei-ectric inductionfurnace. «, . ELECTROCHEMICAL AND MRT\LLrR(il( AL INnrSTin- 433 smmll quantity of crushed quartz or highly-silici-ns sand Dis placed in the center of ,he mold, and an arc is startedbetween the mold A and ihc electrode C, wlicrcby thequ«rti particles become pa-iy or plastic, indicating an incipient fusion. When the central part of the article hasthus been formed,more cnishedquartz is added around it andtreated in the heat of the the article is thus gradu-ally built up. If the mold ismade of non-condtictiiiR ma-terial, two electrodes must beused above it, and both movedtogether relatively to the using highly-siliciousmaterial, the resulting arti-cles present a glazed surface,and are not very strong, butare little liable to attack byacids and are wholly refrac-tory. They cannot only standhigh temperatures, but theircoefficient of expansion isso small that an article ofthis character may be heatedto a very high temp
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