Improvement in the thermal oxidation resistance of chemical vapour-deposited diamond films

1993 ◽  
Vol 12 (17) ◽  
Author(s):  
M. Alam ◽  
Q. Sun
Keyword(s):  
Thermal Oxidation ◽  
Oxidation Resistance ◽  
Diamond Films ◽  
Chemical Vapour

The influence of boric acid on improved persistent luminescence and thermal oxidation resistance of SrAl2O4:Eu2+

2015 ◽  
Vol 167 ◽  
pp. 126-131 ◽  
Author(s):  
Songhak Yoon ◽  
Jakob Bierwagen ◽  
Matthias Trottmann ◽  
Bernhard Walfort ◽  
Nando Gartmann ◽  
...  
Keyword(s):  
Boric Acid ◽  
Thermal Oxidation ◽  
Oxidation Resistance ◽  
Persistent Luminescence

scholarly journals Effect of Drying Temprature on some Properties of Polymer Composite with Epoxy K-153 Matrix

2020 ◽  
Vol 36 (2) ◽  
Author(s):  
Nguyen Trung Thanh
Keyword(s):  
Epoxy Resin ◽  
Surface Structure ◽  
Thermal Oxidation ◽  
Oxidation Resistance ◽  
Polymer Composite ◽  
Polymer Composite Material ◽  
Drying Temperature ◽  
Temperature Changes ◽  
Resistance Surface ◽  
Structure Morphology

The article introduces the effects of drying temperature on curing level, thermal endurance, thermal oxidation resistance, surface structure morphology of polymer composite material based on K-153 epoxy resin (K-153 epoxy resin is made from ED-20 epoxy resin modified by thiokol and oligomer acrylate), T-13 glass fiber and hardener polyethylenepolyamine. The results show that the thermal endurance, thermal oxidation resistance, surface structure morphology of polymer composite change much when the drying temperature changes. When the drying temperature increases from 60°C to about 80°C, the structure of the polymer composites are tighter, the thermal endurance, thermal oxidation resistance also increases, however, if the drying temperature is continued to increase, these properties of the material will reduce.

Diamond/Carbide Nano-Composite Gradient Films: a Route to solve the Adhesion Issues of Diamond Films

2005 ◽  
Vol 890 ◽  
Author(s):  
Thorsten Staedler ◽  
Srikanth Vadali ◽  
Xin Jiang
Keyword(s):  
Diamond Film ◽  
Catalytic Effect ◽  
Soot Formation ◽  
Composite Films ◽  
Diamond Films ◽  
Chemical Vapour ◽  
Compositional Gradient ◽  
Process Step ◽  
Reactive Gases ◽  
Poor Adhesion

ABSTRACTDue to their outstanding mechanical properties diamond films are ideal candidates for many cutting and machining applications. However, industrial applications of these films are limited due to poor adhesion. Two main reasons causing this poor adhesion, which are based on the extrinsic physical and chemical properties of diamond, can be identified: High mechanical stresses induced by a difference of the thermal expansion coefficient between the diamond film and the substrate as well as a catalytic effect in case of metallic substrates containing iron-, cobalt- and nickel that, in combination with a methane atmosphere during deposition, leads to soot formation. One option to overcome these difficulties is to provide an interfacial layer that acts as adhesion layer as well as barrier layer to prevent the catalytic effect of the substrate elements. Even though some successful examples exist, this approach usually requires a time consuming and expensive multi-step process.In this paper, the synthesis of nanocrystalline diamond/carbide composite films with a compositional gradient will be reported. Focusing on the example of diamond/ß-SiC the possibility to create a gradient layer ranging from ß-SiC to diamond in a controlled manner will be shown. The films are prepared by a Microwave Assisted Plasma Chemical Vapour Deposition process (MWCVD) using H2, CH4 and Tetramethylsilane (TMS) as reactive gases. The structure, grain sizes, and volume fractions of the components of these composite films, which consist of a mixture of diamond and carbide phase, can be controlled by adjusting the concentrations of the reactive gases in the gas mixture. This strategy, which handles all depositions in one process step, should allow for an improved diamond film adhesion on tools. The preparation and characterization of the composite films with special emphasize on their mechanical and tribological properties will be discussed and a short outlook on other diamond/carbide systems will be given.

Evaluation of Wear Rate of Nanocrystalline Diamond Films Using Abbott Curve

2017 ◽  
Vol 267 ◽  
pp. 185-189
Author(s):  
Andrei Bogatov ◽  
Vitali Podgursky
Keyword(s):  
Wear Rate ◽  
Cross Sections ◽  
Vapour Deposition ◽  
Microwave Plasma ◽  
Diamond Films ◽  
Chemical Vapour ◽  
Nanocrystalline Diamond ◽  
Wear Rates ◽  
Nanocrystalline Diamond Films ◽  
Worn Surface

The nanocrystalline diamond films were deposited by microwave plasma enhanced chemical vapour deposition (PE-CVD) on Si (100) substrate. Reciprocating sliding tests were conducted using Si3N4 balls as a counter body. A method based on the construction of the Abbott curve representing the areas of pristine and worn surface in the wear scars was applied for estimation of the wear rate. The calculated wear rates were compared with the results obtained by profilometric measurements and direct measurement of the wear scars cross sections by scanning electron microscopy (SEM).

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