Author: William B. Tarpley
Publisher:
ISBN:
Category : Ceramics
Languages : en
Pages : 70
Book Description
Ultrasonic Extrusion
Author: William B. Tarpley
Publisher:
ISBN:
Category : Ceramics
Languages : en
Pages : 70
Book Description
Publisher:
ISBN:
Category : Ceramics
Languages : en
Pages : 70
Book Description
Ultrasonic Extrusion: Reduction in Vehicle and Plasticizer Requirements for Non-Clay Ceramics
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 68
Book Description
Earlier work on the ultrasonic extrusion of lead and aluminum has been extended to the cold extrusion of plasticized ceramic compositions, resulting in significant improvements in increased extrusion rate (more than 100-fold), decreased extrusion pressure (2 to 10 fold), and in extruded specimen properties. It has also been found possible to extrude materials which are normally nonextrudable because of their low plasticizer or water content. Fused, ground alumina could be ultrasonically extruded with 15% less water than the minimum content without ultrasonics, and only 40 to 60% of that used in normal commercial practice. Significant improvement in the strength of as-extruded shapes, as well as reduced shrinkage and deformation in drying and firing, resulted. Compositions normally using 3 w/o ammonium alginate as a plasticizer can be extruded with 0.2 w/o plastizer when ultrasonically activated. It has been postulated that the ultrasonic effects observed are derived from reduction of surface friction, shear thinning of the thixotropic systems, particle orientation, surface-film rupture, and wetting phenomena. As-extruded specimen improvement was evidenced by a smoother surface and freedom from cracks, tearing, and peeling. When steel dies were used, abrasion of the die surface sometimes caused a superficially discolored surface in nonultrasonic extrusions. The comparable ultrasonic extrusions showed little or no discoloration as the ultrasonic power level was increased. Ultrasonically extruded specimens which were fired in the same kiln loading as their corresponding controls show small but consistent increases in fired density. Water absorption was approximately 75% of the control. The highest moduli of rupture in the fired specimens were found in the ultrasonic specimens even though these required only 25% of the extrusion pressure of the controls.
Publisher:
ISBN:
Category :
Languages : en
Pages : 68
Book Description
Earlier work on the ultrasonic extrusion of lead and aluminum has been extended to the cold extrusion of plasticized ceramic compositions, resulting in significant improvements in increased extrusion rate (more than 100-fold), decreased extrusion pressure (2 to 10 fold), and in extruded specimen properties. It has also been found possible to extrude materials which are normally nonextrudable because of their low plasticizer or water content. Fused, ground alumina could be ultrasonically extruded with 15% less water than the minimum content without ultrasonics, and only 40 to 60% of that used in normal commercial practice. Significant improvement in the strength of as-extruded shapes, as well as reduced shrinkage and deformation in drying and firing, resulted. Compositions normally using 3 w/o ammonium alginate as a plasticizer can be extruded with 0.2 w/o plastizer when ultrasonically activated. It has been postulated that the ultrasonic effects observed are derived from reduction of surface friction, shear thinning of the thixotropic systems, particle orientation, surface-film rupture, and wetting phenomena. As-extruded specimen improvement was evidenced by a smoother surface and freedom from cracks, tearing, and peeling. When steel dies were used, abrasion of the die surface sometimes caused a superficially discolored surface in nonultrasonic extrusions. The comparable ultrasonic extrusions showed little or no discoloration as the ultrasonic power level was increased. Ultrasonically extruded specimens which were fired in the same kiln loading as their corresponding controls show small but consistent increases in fired density. Water absorption was approximately 75% of the control. The highest moduli of rupture in the fired specimens were found in the ultrasonic specimens even though these required only 25% of the extrusion pressure of the controls.
Ultrasonic Extrusion
Author: U.S. Atomic Energy Commission. Division of Technical Information
Publisher:
ISBN:
Category : Ceramics
Languages : en
Pages : 66
Book Description
Publisher:
ISBN:
Category : Ceramics
Languages : en
Pages : 66
Book Description
Ceramic Processing
Author: R.A. Terpstra
Publisher: Springer Science & Business Media
ISBN: 9401105316
Category : Technology & Engineering
Languages : en
Pages : 228
Book Description
Ceramic Processing is the first comprehensive, stand alone, multi-authored book on advanced ceramic processing. It provides an overview of the important processing steps involved in the fabrication of advanced ceramics for structural and functional applications.
Publisher: Springer Science & Business Media
ISBN: 9401105316
Category : Technology & Engineering
Languages : en
Pages : 228
Book Description
Ceramic Processing is the first comprehensive, stand alone, multi-authored book on advanced ceramic processing. It provides an overview of the important processing steps involved in the fabrication of advanced ceramics for structural and functional applications.
OTS Selective Bibliography
Author: United States. Dept. of Commerce. Office of Technical Services
Publisher:
ISBN:
Category :
Languages : en
Pages : 508
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 508
Book Description
Ultrasonic Tube Drawing
Author: William B. Tarpley
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 30
Book Description
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 30
Book Description
U.S. Government Research Reports
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 176
Book Description
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 176
Book Description
Atomic Energy Research Reports for Sale by the U.S. Department of Commerce, Office of Technical Services
Author: Business and Defense Services Administration
Publisher:
ISBN:
Category :
Languages : en
Pages : 68
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 68
Book Description
Monthly Catalog of United States Government Publications
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1990
Book Description
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1990
Book Description
Monthly Catalog of United States Government Publications, Cumulative Index
Author: United States. Superintendent of Documents
Publisher:
ISBN:
Category : United States
Languages : en
Pages : 1284
Book Description
Publisher:
ISBN:
Category : United States
Languages : en
Pages : 1284
Book Description