摘要:

AbstractOne of the chief objects of the study of the pinitized zone at American Canyon has been the identification of the material, with particular attention to the mineral content and nomenclature. The firing behavior has also been investigated and compared with the corresponding behavior of comparable material from other localities, including pyrophyllite, sericite, and muscovite. The methods employed include a brief field inspection, microscopic observation, chemical analysis, and an X‐ray diffraction study of natural and fired sample

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1940.tb14208.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY

摘要:

AbstractA deposit of a soft talclike rock, called “pinite,” composed of hydrous aluminum silicates, has been found recently in South American Canyon on the east side of the Humboldt Range near Rochester, Nevada. Prospecting and development of the deposit have consisted of trenching, open‐cut work, and the subsequent removal of sufficient tonnage to show a large zone of uniform material.Pinite inverts readily to mullite, and firing is accompanied by a permanent expansion. Thermal‐expansion curves show an absence of free silica. Pinite has a high specific gravity, it fires extremely hard and white, and the fired product is highly resistant to certain types of fluxes and to abrasion.Refractories have been produced and placed in selected applications. The results obtained from tests with pinite indicate a superiority over other refractories in certain types of service.Products have been made by the stiff‐mud and casting processes, Pinite refractories have been used in rotary enamel smelting furnaces and in the cold zone and cooler linings of rotary cement, lime, and magnes

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1940.tb14209.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY

摘要:

AbstractThe chemical and mineralogical content and the physical properties of zoisitic aplite rock, mined in Amherst County, Virginia, and milled in Nelson County, Virginia, have been investigated. The possibilities of various ceramic uses of zoisitic aplite are discussed.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1940.tb14210.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY

摘要:

AbstractSimilar to other enamel shop problems, tearing has not been reproducible under controlled conditions in the laboratory. Experiments show that tearing is caused by a cracking of the bisque before enamel fusion. To produce bisque cracking experimentally in the laboratory, a ground‐coated cross‐bend strip, 2 by 12 inches, was covered on one side with a coating of the test enamel. The enamel was dried, and before firing it was flexed to a predetermined degree in a Danielson‐Lindemann cross‐bending machine. The strip was fired, and the degree of tearing was studied. The effect of various factors, such as grinding fineness, application, clay, and other mill additions, in overcoming tearing difficulties was determined by this method. Certain materials which overcome tearing do not prevent bisque cracking but cause the cracked bisque to heal rather than break away during the firing process. Experimental results ar

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1940.tb14211.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY

摘要:

AbstractThe physical properties of wall‐tile bodies and floor‐tile bodies are described. The wall‐tile bodies are fluxed respectively with nepheline syenite; feldspar; talc and feldspar; talc and syenite; talc, pyrophyllite, and syenite; and talc, pyrophyllite, and feldspar. Floor‐tile bodies, developing at lower temperatures, may be formulated with nepheline syenite. The greater refractoriness of American clays used in these bodies, as compared to English clays, is compensated for by the increased fluxing action of nepheline

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1940.tb14212.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1940.tb14213.x

出版商:Blackwell Publishing Ltd    

年代:1940

数据来源: WILEY