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Visar resultat 1 - 5 av 11 avhandlingar som matchar ovanstående sökkriterier.

  1. 1. Novel Technique to Improve High-Velocity Cold Compaction Processing of Polymer Powders and Polymer-Based Nanocomposite High Performance Components

    Detta är en avhandling från Stockholm : KTH

    Författare :Bruska Azhdar; KTH.; [2006]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; polymer powders; nanocomposites; high-velocity compaction; high-energy ball milling; TECHNOLOGY Industrial engineering and economy Manufacturing engineering and work sciences Manufacturing engineering; TEKNIKVETENSKAP Industriell teknik och ekonomi Produktion och arbetsvetenskap Produktionsteknik;

    Sammanfattning : Compaction of polymer powders and polymer-based nanocomposites by uniaxial high-velocity cold compaction (HVC), by high-energy ball milling (HEBM) and using a novel technique, relaxation assists, was investigated with a focus on the process parameters, the compactibility characteristics, surface morphology and friction. The basic phenomena associated with HVC are explained and the general energy principle is introduced to explain the pull-out phenomenon, springback gradient, delay time, relative time of the pressure wave, and stick-slip phenomenon during the compaction process. LÄS MER

  2. 2. Improved high velocity cold copaction processing polymer powder to high performance parts

    Detta är en avhandling från Stockholm : KTH

    Författare :Bruska Azhdar; KTH.; [2005]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; high-velocity compaction; powder polymers; polyamide-11; relaxation assist; compactibility; relative green density; morphology; pull-out; springback; NATURAL SCIENCES Chemistry Organic chemistry Polymer chemistry; NATURVETENSKAP Kemi Organisk kemi Polymerkemi;

    Sammanfattning : A uniaxial High-Velocity Compaction (HVC) process for polymer powder using a cylindrical, hardened steel die and a new technique with relaxation assist was tested with a focus on the compactibility characteristics and surface morphology of the compacted materials using various heights of relaxation assist device with different compacting profiles.Relaxation assist device was presented as a new technique to reduce springback, pull-out phenomenon and to improve the compaction process. LÄS MER

  3. 3. Spray-Dried Powders for Inhalation Particle Formation and Formulation Concepts

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Jessica Elversson; Uppsala universitet.; [2005]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Pharmaceutics; Spray drying; Particle formation; Density; Protein formulation; Encapsulation; Coating; Competitive adsorption; Polymer; ESCA; AFM; FTIR; Galenisk farmaci; PHARMACY Pharmaceutics; FARMACI Galenisk farmaci;

    Sammanfattning : Spray drying is a method with a high potential in the preparation of protein particles suitable for pulmonary delivery. However, surface induced denaturation of bio-molecules during atomization and subsequent drying can be substantial and it is therefore important to develop new formulation concept for concurrent encapsulation and stabilization of proteins during spray drying. LÄS MER

  4. 4. SmCo for polymer bonded magnets : Corrosion, silanization, rheological, mechanical and magnetic properties

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Muhammad Irfan Qadeer; KTH.; [2012]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Organofunctional alkoxysilanes; High temperature oxidation; Rare-earth magnetic alloys; SmCo; Isothermal; Non-isothermal; Microstructure; Magnetic properties;

    Sammanfattning : This thesis presents the study of organofunctional alkoxysilane coatings to prevent high temperature oxidation of Sm-Co powders. Sm-Co are important permanent magnetic alloys, owing to their high Curie temperature and large values of magnetocrystalline anisotropy. LÄS MER

  5. 5. Preparation and characterization of perovskite structure lanthanum gallate and lanthanum aluminate based oxides

    Detta är en avhandling från Stockholm : KTH

    Författare :Shuai Li; KTH.; [2009]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Lanthanum gallate; lanthanum aluminate; ceria; composite; solid oxide fuel cell; electrolyte; polymer complexing.; TECHNOLOGY Materials science Functional materials; TEKNIKVETENSKAP Teknisk materialvetenskap Funktionella material;

    Sammanfattning : The present work was initiated to study the synthesis and properties of lanthanum gallate based oxides as intermediate temperature electrolyte for solid oxide fuel cells. The wet chemical method, polymer complexing route, was used to prepare the precursor powders. LÄS MER