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Preparation and characterization of ...

Vail, Neal Kent.

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Preparation and characterization of microencapsulated, finely divided ceramic materials for selective laser sintering.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Preparation and characterization of microencapsulated, finely divided ceramic materials for selective laser sintering./
Author:	Vail, Neal Kent.
Description:	402 p.
Notes:	Source: Dissertation Abstracts International, Volume: 56-02, Section: B, page: 1044.
Contained By:	Dissertation Abstracts International56-02B.
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9519409

Preparation and characterization of microencapsulated, finely divided ceramic materials for selective laser sintering.
Vail, Neal Kent.

Preparation and characterization of microencapsulated, finely divided ceramic materials for selective laser sintering. - 402 p.

Source: Dissertation Abstracts International, Volume: 56-02, Section: B, page: 1044.

Thesis (Ph.D.)--The University of Texas at Austin, 1994.

Selective Laser Sintering (SLS) is an established rapid prototyping and manufacturing process capable of fabricating solid objects via laser induced, thermal sintering of powdered thermoplastics. The focus of the present work was to advance SLS by introducing the capability of fabricating solid shapes from high temperature materials such as ceramics and metals. This was done using fugitive thermoplastic binders without modification to the present implementation. SLS processing of these composite powder systems yielded green shapes that could be post-processed by traditional means to give functional ceramic or metal objects.Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Preparation and characterization of microencapsulated, finely divided ceramic materials for selective laser sintering.
LDR:03408nam 2200301 a 45 001 929703
005 20110427
008 110427s1994 eng d
035 $a (UnM)AAI9519409
035 $a AAI9519409
040 $a UnM $c UnM
100 1 $a Vail, Neal Kent. $3 1253189
245 1 0 $a Preparation and characterization of microencapsulated, finely divided ceramic materials for selective laser sintering.
300 $a 402 p.
500 $a Source: Dissertation Abstracts International, Volume: 56-02, Section: B, page: 1044.
500 $a Supervisor: Joel W. Barlow.
502 $a Thesis (Ph.D.)--The University of Texas at Austin, 1994.
520 $a Selective Laser Sintering (SLS) is an established rapid prototyping and manufacturing process capable of fabricating solid objects via laser induced, thermal sintering of powdered thermoplastics. The focus of the present work was to advance SLS by introducing the capability of fabricating solid shapes from high temperature materials such as ceramics and metals. This was done using fugitive thermoplastic binders without modification to the present implementation. SLS processing of these composite powder systems yielded green shapes that could be post-processed by traditional means to give functional ceramic or metal objects.
520 $a An emulsion based poly(methylmethacrylate-co-n-butylmethacrylate) was developed as the binder system. The properties of this binder, including its glass transition temperature, viscosity, and decomposition mechanisms were tailored for application to SLS. Evaluation of the binder under ideal conditions showed polymer coated powders yielded greater green strengths than mixtures of polymer and powder. Polymers with melt flow indices of 5-15 g/10min at 200$\sp\circ $c and 0.49MPa produced the strongest green shapes by optimizing binder rheological and mechanical properties. Furthermore, incorporation of adhesion promoting functionalities into the binder backbone and matching of acid-base interactions between the binder and the powder substrate improved green strengths. A preferred terpolymer of di-methylamino-ethylmethacrylate at 2 wt. % increased green strengths more than 20%.
520 $a Application of the SLS process to polymer coated ceramic materials proved very successful. A number of material systems, including a spheroidized soda-lime glass and an irregular silicon carbide, were tested with the developed binder. Detailed work with both of these substrates yielded information pertinent to the processing of polymer coated powders. Green shapes with strengths $> $1 .0MPa (150 psi), good accuracy, fine features, and no curl were easily fabricated from these and other material systems. However, analysis of fabricated specimens showed overall binder to degrade by 6-20 wt. %. This result was modeled with a 1-dimensional thermal diffusion equation coupled with measured decomposition rate kinetics. Model agreement with experimental results was very good. The model was used to evaluate the effects of SLS processing variables on the extent of polymer degradation in order to further optimize binder performance.
590 $a School code: 0227.
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Engineering, Chemical. $3 1018531
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0495
690 $a 0542
690 $a 0794
710 2 0 $a The University of Texas at Austin. $3 718984
773 0 $t Dissertation Abstracts International $g 56-02B.
790 $a 0227
790 1 0 $a Barlow, Joel W., $e advisor
791 $a Ph.D.
792 $a 1994
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9519409