Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 33 for “"Surface hardness"”.
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Surface hardness classification via unmanned aerial vehicles gripper finger deflection
… (UAV) gripper to determine, upon impact, the hardness of a landing site. We design and fabricate a four finger gripper that uses a rotary component to convert the rotational motion of a servo to the linear motion of the finger assemblies. We functionally test a gripper prototype made from …
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Comparative evaluation of the compressive strength surface hardness and porosity of a selection of capsule-mixed versus hand-mixed Glass lonomer cements
… equivalents in terms of compressive strength, surface hardness and porosity. Materials and Methods: Four groups of 10 cylindrical specimens were manufactured for each of the four specified hand-mixed posterior glass ionomers for each test that was performed: Riva Self Cure (RSCH) (SDI Limited); …
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Surface modification of titanium-based alloys
… OBDH process can be carried out to modify the surface properties of titanium and alloys. Both steps of this process play a vital role in achieving a thick modified layer for improved tribological properties of titanium and alloys. Performing the oxidation step of OBDH heat-treatment at higher …
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Surface properties and the bioactivity of glass-ionomer dental cements and related materials
The improvement and modification of the surface hardness of glass-ionomer dental cements was investigated in the studies discussed in this thesis to allow the range of clinical applications of these cements to be extended. Storing the cements in non-aqueous media whilst heating at 60 oC increased …
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The improvement of the wear performance of the Ti-64 alloy using the oxygen boost diffusion treatment
… Diffusion Hardening (OBDH) is a cost effective surface modification process which can greatly improve the tribological properties of titanium components. This report deals with the oxygen diffusion treatment of Ti-6Al-4V (Ti-64), the most commonly used titanium alloy, to rank various treatment …
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Switchable stiffness scanning microscope probe
… the stiffness of the probe adjustable to the surface hardness of the sample, and a very low overall stiffness, which is needed in order to achieve high resolution imaging. The switchable stiffness probe allows the scanning of biological samples with varying surface hardness without changing …
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Effect of heat treatment on the mechanical and corrosion properties of the CoCrNiFeAl HEAs
… rate compared to the as-cast alloys, while the surface hardness was affected negatively by increasing the heat treatment conditions.
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An Investigation of Geopolymers for Use In High Temperature Applications
… through quenching with water. A nondestructive surface hardness test is also developed to determine compressive strengths at high temperatures. Specimens are also exposed to molten metal to simulate corium dropping onto the materials during a core meltdown.
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Comparison Of Vickers Hardness Between Dental Ceramics And Hybrid Materials
The study aims to compare Vickers hardness of five definitive crown materials in a controlled laboratory setting. Materials & Methods: Five specimens (15 x 12 x 1.5 mm) were obtained from each tested material: zirconia (Lava Ultimate), lithium disilicate (IPS e.max CAD), lithium silicate reinforced …
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The effects of annealing on phase transformation in platinum-molybdenum coatings
… of ordered phases increases the strength and surface hardness and could also have an impact on surface activity and chemical properties. The changes in mechanical, physical and chemical properties could be of significant importance in enhancing the performance of platinum-based systems in …
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Can the natural turf pitch affect injury risk and performance within elite football?
… climatic variation and footfall affecting its hardness, catalyzed the development of more robust, hybrid natural turf pitches. Despite such evolution, stakeholders continue to question the role hardness plays regarding injury on such natural turf. Unfortunately, the literature is scarce and …
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Long-term performance of pot hardware in continuous galvanizing lines
… test, periodic measurements of wearing rate, surface microstructure and surface hardness were carried out. An unique dross build-up setup which consists of two sleeves counter rotating against each other was designed to simulate the dross build-up in production line. The chemical composition …
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Comparison of Additively Manufactured and Wrought 17-4 PH Stainless Steels in Ultra Low Cycle Fatigue
… post fracture microstructure, fractography, surface hardness, and material characterizations are conducted. Results indicate reduced fatigue life for AM 17-4PH stainless steel as compared to the wrought counterparts. Fatigue life reductions of 62% and 65% were measured for the AM steel …
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Annealing effects on platinum coating morphology
… which could be a significant limitation when the surface hardness and structural integrity are of importance. Besides the applications as protective coatings and electronics, the intermetallic phases of the Pt-Al binary system can play a significant role in jewellery industry where they can …
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Fatigue in low pressure carbonitrided steels
… treatment parameters were modified to ensure the surface hardness and effective case depths were comparable for the four alloys. The profiles for hardness, retained austenite, residual stress, carbon and nitrogen were comparable for all the alloys. However, the fatigue performance of each alloy …
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Electrodeposition of amorphous matrix Ni-W/Wp̳ composites
… incorporation between the substrate side and the surface side of the deposit was observed; the area close to the substrate had a higher incorporation than the area near the surface. Hardness testing showed mechanical property differences through the thickness of the deposit with the area near the …
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The Effect of Two Maintenance Procedures on an Equine Arena Surface in Relation to Motion of the Hoof and Metacarpophalangeal Joint
Maintenance procedures are reported to affect surface properties. The majority of work regarding surfaces in relation to performance and welfare is currently race track specific. The study aimed to investigate limb and hoof movement on a synthetic arena surface following two different commonly used …
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Effect of Overlying Material on EndoCem Mineral Trioxide Aggregate Setting Reaction in Primary Molar Pulp
… of common restorative materials on the microhardness of ENDOCEM-MTA in primary molar pulpotomies. The study assessed whether the material placed over ENDOCEM-MTA affects its setting reaction, surface hardness, and uniformity across depths. Methods: Fifty extracted primary molars were prepared …
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Promoting cellular adhesion to glass polyalkenoate cement by biopolymer addition
… as the material of choice to restore root surface caries lesions. Although apparently successful in the majority of cases it is not always possible to achieve a reliable seal from the oral environment when such lesion extends subgingivally. This is due to haemorrhage impeding placement and …
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An investigation of wear and the performance of steels in the gold mining industry
… this objective it was necessary to examine the surfaces of worn materials in order to gain a better understanding of the different wear mechanisms and also to examine the extent and depth of deformation induced by abrasive wear. Numerous proprietary wear resistant materials and stainless steels …
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