Document o9OqyeKLrL5oy8QqQGzBOq5D3

CERAMIC ABSTRACTS Compiled by The, American Ceramic Society Volume 24,1945 Ross C. P91ST, Bdtt* hUXT J. Cm* ) Hmslt C. VaK Seaoios > Awnair Zi1AA WnAmo ; CrmmrU* ** Puitiouw; R. L. Sraxs. CTuirmon; H. W. Tmaaat, W. A- Wjiso*, S. C. Lyok. R, C. Pvy, ex oSeio F. C. Arrases A. A. Aysn Martin Baker 1. R. Barren W. R. Bede i A. C. Sevan'' A. J. Biddulpb R. G. Cpell AKTRACTER5 1. C. Chadwick M. V. Cocdoide W. D. Foster V. D. Frechette R. A. Greiory P. Gredaaib Max Hartesbeim E. A. Hauav F. G. Hede R. A. Heisdl J. F. Homer M. Hcseb E. E. Ho*e F. J. Hurlbut G. M. Hun G. A. Kirkeadale B. S. Lane E. D. Mehs R. V. McAllister E. P. Murphy. Jr. D. G. Fierce E. C. Fierce Alexia Piacns M. E. Poor Editorial Ofiet: 2525 North Hich Street, Columbus 2, Ohia puifc&lie* Qffii*; 20tb and Northampton Street*, Easios, Fa. H. 2. Richardses Margaret Roach B. C. Ruprecht A- B. Searle . L. Sbattueb Hans 7bursaucr C. Wentworth Samuel Zttiou .0.2 >nnad Tiki* < con ed by s and third These then c pren this ks 4 1300*. 1-Si-O I raw form* ieldtd t paid .lau'o* Amtr. 1936)) n and erwm. .926)). i960* -a. and sterile 1200*. mlarly at the re pro- ridded ben it gbx to ff-Mgliter 3 asd is eon* if 10% (M> sdueed 0-SiO. -ith re al esipered. lornua lied at countpproxL The r-Mg:.Ho. Both 1. Dec. . iSTNlM 2.367.. -3-202). .S'OIVK (April d F. B. '5. Jan. --The which om the litharge oxidiztali and -g in aa product Oil. jont pa Jaa. 9. 1945 General 47 General Ceramics taday. Akon. Ckrm. Ap (London). SO U303I 55<i (llH-t).--Ceramics are being wed by msuui* lecturers m place of plaeuce. iteel. aideel coppg, alumi num. rise, and rubber. Prtscn t-day industrial white, ware has characteristics that make it highly suitable for many industrial uses. Its resistance to abrasion is high. Almost the only materials Out outwear wbiteware are Tubbtf-lire-trcad stock and manganese steel; for some exacting uses, such as nozzles for sandblast equipment, the best ceramic nozzle* will outlast manganesesteel, asd for lining cote chutes, hard vitreous tile is still in good eondi- non whes both steel and rubber Usings are wore out. The compressive strength of ceramics mages from 26.000 to 80.000 lb./sq. is. This compares with 9000 to 47,000 for aluminum alloys. 16,500 to 46,000 for thermosetting plastics. *000 to 20,000 for zinc alloy*, asd 66.000 to 400,000 for ferrous alloy*. Ceramics an low la tensile strength (1500 to 10.000 lb./sq. is.). This deficiency cast eftes be made up by insea&ng the thicksr*s or other di mensions of the ceramic unit. Resistance to chemical* is high. Ceramic ware wQl withstand almost asy compound except hydrofluoric acid. Is hardness, it exceed* most plaitio asd aoo/erreus metals: It is equal to glass sad ao/xm this alloy steel* asd chilled out iron. Obstacles to the use of ceramic part* a* substitute) for metal is complicated assemblies ire the shrinkage asd occasional warping that take place during firisg, but dimensional tolerance* sufficiently fine have been obtained by several pews- molding method*. One method mold* a part in tb traditional manner but somewhat oversize. A preliminary firing shrinks the part to a certain extent but leave* it still oversize.' The first firing is stopped while the material i* rull soft enough to machine with standard tools. The machining is done to allow an exact margin for the addi* rional shrinksg that occurs during the second and final firing. In another method, exact pans are obtained by machining rods of fused mica and gloss up to 1 in. thick. Mica and glass are sot fired during the forming process because, aclike true ceramics, they soften at high tempera* cures, but the mio-gbxs material can be used like por celain; it ha* the advantage of michinability and eas ba pressure molded like plastics. In a third method, care fully blended and moistened days are molded under such heavy pressure that warpage is practically absent, and the result is a dense high-strength product. The fired product can be held to an accuracy of `/u in. per inch of dimension, and further exactness can be obtained by grinding the finished article accurately to size. A.B.S. Ctasxificatioo of natural organic binder*. Eswaan F. McNajzaaa ano Jav E- Coitsroao. Jour. Amtr. Ceram, lee.. 25 (11 25-31 (19451.--14 referenes. 7 figuro. Congress displays industry's war effort. Anon. Amer. fovndrjmtn, 4 1C] 2-3 (1944).--The 4Sth annual cooven, lion of the American Foundrymcn's Assa. is discussed. M.A.5. Findings from Foundation surreyi of *t plant! ?. R. Holds* anp Vf. C. L. Ssmro.t. Presented at meeting of Industrial Hygiene Foundation, Pittsburgh. Pa.. Nov.. 1944: abstracted in Ja/e/yng., 55 [0163-66 (1944).--The report discusses among other things the conversion of forms of quartz into tridymite and cristahalite, which are more destructive of animal tissue than quartz. Where the eiay.pot process is used in liassmoking. Use reclaiming of the discarded pots produces a serious health hazard. Like wise. in the glass industry, fumaee and tuille itones eon- tain aWut 15% cristobalite. and the principal silicosis hazard ;ma in departments where the clay* and furnace and tuille stones are manufactured and handled. A survey of industrial hygiene in a portion of the ceramic industry is under way. and a report ts expected ia 1945 in which con clusions wifi differ somewhat from prevalent idea*. The resort gives some consideration to dust control for masons in gju* and similar plants and in particular to a portable exhaust unit for a brick-cutting saw in common use. Minimizing dust around clay and flint storage bins. etc., is touched upon. Investigation* have also beeo made is a sand-washing plant to determine what additional mess- ores for dust control might be necessary. MJL 5** yon any idsa *h*t protptets vast ts know stent your product? E. L. Ssajuu. Ini. Marknim, 29 [121 51-52. 55 (1944).--S. discusses results of survey made among engineering and industrial readers a* to possible points to bo emphasized in advertising eontcruetios equip ment sad building materials. One of those submitting answers condemns the use of hammered or frosted glass in factory windows. He ask*. "Why don't glass manu facturers advise owners or engineers to install a Use of dear glass at eye level where the bulk of the wiodows are ham mered or frost glass'" Another wanted physical data pertaining to glass block. S. found the men interviewed to be practical, common-sense folk and fait that their sug gestion* to manufacturers asd advertisers should be heeded. M.R. Mist asd dost eoUectiea. C. E, Lasno. /fosAng. PipintonA Air CeniUienint, 16 (7] 41CM4: (S) 464-66; (101 5/8-81 (1944).--L. reviews the purpose) of mist and dust collecting and summarise* th* characteristics of dust. Tba main reasons for industrial dust collection are (1) nuisance elimination. (2) improvement of product quality, (3) reduction of equipment mainttnanet, (4) elimination of safety and health hazards, and (5) recover or collaction of powdered produets. To properly design industrial cm* trol equipment it is necessary to recognize and understand the fundamental properties and characteristics of gas di* persoids. These include particle size (cement dust is oaa of the largest of common dusts), particle classification. ex plosion hazards, and health hazards. L. then discusses the methods of measurement and the character of atmot- pheric pollution.- Dust fall, use of Riageiruano charts, impiogen. precipitators, filters, and atmospheric pollution data are included. Finally, he cavers the sampling of process and ventilation gases to determine the performance of dust-collecting equipment, to evaluate the need for in* stalling a system, or to obtain idonsation for design, 43.references, 4 illustrations. M.R. Noted engineer stresses research at masting. H. F. Utuiv. Pit and Quarry, J7 (Cl 70, 78 (1944).--At a meet. Lnr hell in Los Angeles. Nov. 9. 1944, Stanton Walkc di* cussed the research activities of the Nations Sand and Gravel Assn, and the National Ready Mixed Concrete Assn. He davoted much time to the simplification of sizes for coarse aggregate* u veil as to the research develop, menu in fine aggregate*. It eras decided to form com- mlttees of producers from the northern and southern part* of California to work jointly with committees of Govern ment tnriactn to facilitate reducing the Urge ousthc of sizes of aggregates now being produced. 1 photograph- M.R. Organization af riuuclL A. Pairs*. Jeter. Inn. Putl. 17 (901 164-53 (June. 19+4); abstracted in BuU. Bril. Son*Ptrreuj .Uttels Rtstarek Assn.. No. 132, p. 250 (Aug., 1944).--P. characterizes organization of research ia universities and college*, special research institute, in dividual industrial undertakings, cooperative industrial undertaking*, and cooperative industrial research- The Department of Scientific and Industrial Research and the Fuel Research Station are described, and the selection of a research staff ia discussed. Prevtndon of pneumoconiosis. Anon. CJttm. An [London), SI [13121 ISO--81 (1944).--Pneumoconiosis is a group name for all lung disease* caused by dust particles; two forms of it are silicosis and asbestosis. The best methods of prevention are (1) replacement of the substance producing the obnoxious dust by s barmless one, e g., alumina iu place of flint for "dusting" and bedding in pot tery manufacture and srufieial abrasive materials for sand stone ia grinding; (2) prevention of the scape of dust into the workshop atmosphere, usually by means of hood* and air suction; (3) the use of respirators by all workers likely to be affected; and (4) copious general ventilatioo. In the British Isles, the Factories' Aet. 1937. requires that pro vision shall be made for rendering harmless as far as prac-