Sökning: "Wn"

Visar resultat 1 - 5 av 36 avhandlingar innehållade ordet Wn.

1. 1. Microstructural investigation of CVD TiAlN, TiN and WN coatings

   Författare :Ren Qiu; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEM; XEDS; TiN; SEM; APT; TiAlN; coating growth; EBSD; WN; CVD;

   Sammanfattning : High speed machining of workpiece materials puts extreme thermal and pressure loads onto the cutting tool inserts, which thus must possess both high hardness and good toughness. Nowadays, most cutting tools are made of cemented carbide substrates that are coated with wear-resistant coatings. LÄS MER

3. 2. Muspel and Surtr : CVD system and control program for WF6 chemistry

   Författare :Johan Gerdin Hulkko; Mats Boman; Tobias Törndahl; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; CVD; W; WN; system; WF6; TiN; control program; LabView; CVD; W; WN; system; WF6; TiN; styrprogram; LabView; Chemistry with specialization in Inorganic Chemistry; Kemi med inriktning mot oorganisk kemi;

   Sammanfattning : CVD (Chemical Vapour Deposition) is an advanced technique for depositing a coating on a substrate. CVD implies that a solid phase is deposited on a normally heated substrate surface using a reactive, gaseous mixture. The reaction gas mixture must be carefully chosen to prevent homogeneous nucleation in the gas phase. LÄS MER

4. 3. Metal Cluster Reactivity. Adsorption of small molecules in biomolecular collisions

   Författare :Mats Andersson; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; O2; CO; ionization potential; Con; Fen; NO; sticking probability; laser ionization; D2; Wn; Cun; Rhn; reaction probability; cluster; jellium model; Nbn; metal cluster reactivity; N2; time-of-flight mass spectrometry; Nin;

   Sammanfattning : Metal clusters can be characterized as the tiniest possible metal particles, containing only an easily counted number of atoms. In this work, reactions between metal clusters and diatomic molecules have been investigated. We have constructed an experimental set-up to produce and detect clusters, and to investigate their chemical reactivity. LÄS MER

5. 4. Reactivity of Metal Clusters with Diatomic Molecules

   Författare :Lotta Holmgren; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Nbn; cluster; reactivity; Rhn; NO; D2; CO; N2; laser vaporization; Wn; Nin; photoionization; time-of-flight mass spectrometer; ionization potential; Cun; O2; Vn;

   Sammanfattning : The reactivity of transition-metal clusters, in the approximate size range 10-60 atoms, with diatomic molecules has been investigated. A pulsed beam of neutral clusters is produced by a laser-vaporization source and passed through a low-pressure reaction cell containing the reactive gas. LÄS MER

7. 5. Reactivity of small transition-metal clusters with carbon monoxide

   Författare :Lotta Holmgren; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Co_{n< sub>}; reaction probability; Ni_{n< sub}; time-of-flight mass spectrometry; carbon monoxide; Wn_{n< sub}; Nb_{n< sub}; adsorption; laser vaporisation; supersonic beam; Cu_{n< sub};

   Sammanfattning : .... LÄS MER