Brush Bristle Stiffness Performance Using Tribometer
Brushes are among the most basic and widely used tools in the world. They can be used to remove material (toothbrush, archaeological brush, bench grinder brush), apply material (paintbrush, makeup brush, gilding brush), comb filaments, or add a pattern. As a result of the mechanical and abrasive forces on them, brushes constantly have to be replaced after moderate use. For example toothbrush heads should be replaced every three to four months because of fraying as a result of repeated usage. Making the toothbrush fiber filaments too stiff risks wearing away the actual tooth instead of soft plaque. Making the toothbrush fibers too soft makes the brush lose its form faster. Understanding the changing bend of the brush, as well as the wear and overall change in shape in the filaments under different loading conditions is necessary to design brushes that better fulfill their application.
Dental Wear Surface Subtraction Using 3D Profilometry
Dental wear, the loss of tooth material due to reasons other than cavities and sudden dental trauma over the course of a lifetime, is a normal process in all adults. The topmost layer of a tooth is enamel, which is the hardest substance in the human body, and cannot be naturally restored. Enamel can wear away from tooth-to-tooth, tooth-to-foreign body, or tooth-to-dental crown wear, as well as a result of exposure to acidic environments. It is important to be able to precisely measure the wear rate, volume loss, and change in topography of a tooth or dental crown in order to be able to effectively slow down tooth wear. All these calculations can be made using a surface subtraction study.
Surface wear subtraction studies are critical in any application looking at the topographic change in a relatively small area in relation to the entire sample. Such studies can effectively quantify surface wear, corrosion, or the degree of similarity between two parts or molds. Being able to precisely measure the surface area and volume loss of an area of interest is vital in order to properly design wear or corrosion resistant coatings, films, and substrates
Edge Chipping Resistance Using Macroindentation
The resistance of the edges of brittle materials to chipping or flaking from concentrated loads is a critical property for dental restoration ceramics, resin composites, edge-mounted optical devices, ceramic tool bits, thin semiconductor chips, and many other materials. The edge chipping resistance test provides a method to quantify and measure the fracture resistance, toughness, and edge chip strength of these materials. This method uses a conical indenter to chip the rectangular edge of a brittle sample at set distances from the edge. Archeological evidence has revealed that this method is similar to the way early humans selected stones to make tools and weapons. Hundreds of thousands of years later, edge chipping tests remain a critical tool for applications where edge toughness is concerned.
Stent Coating Failure Using Nano Scratch Testing
Drug–eluting stent coating is a novel approach in stent technology. It possesses a biodegradable and biocompatible polymer coating that releases medicine slowly and continuously at the local artery to inhibit intimal thickening and prevent the artery from being blocked againii. One of the major concerns is delamination of the polymer coating that carries the drug-eluting layer from the metal stent substrate. A reliable technique is in need to quantitatively measure the interfacial strength between the polymer coating and the metal substrate. The delicate structure and the small thickness of the stent mesh (comparable to a human hair) bring great challenge to the testing.
Rotational Measurement Using 3D Profilometry
Surface roughness and texture of the mechanical parts is vital to its end use. Conventional surface profilometry usually scan the sample surface from just one direction. A precise 360° rotational measurement of parts with a cylindrical shape is in need to measure detailed surface feature from different angles. Such 360° 3D inspection ensures the narrowest tolerances in quality control of manufacturing processes. Moreover, during the service time, wear creates dents, cracks, and surface roughening all over the cylindrical part surface. Surface inspection on one face of the sample may miss important information hidden on the backside.
3D Wear Track Scan In Situ on Tribometer
Conventional pin-on-disc or reciprocating tribometer records the COF during the wear test. The wear rate is measured after the wear test by moving the sample to a profilometer and scanning the cross section profiles of the wear track. Such a method may introduce errors when the sample possesses an inhomogeneous wear track. Moreover, samples like multilayer coatings possess different wear resistance at different layers of the coating. A more reliable and repeatable technique for wear evaluation is in need – Nanovea developed a tribometer equipped with a 3D non-contact profilometer that performs a 3D scan of the complete wear track on the sample stage of the tribometer. It monitors the evolution of the 3D wear track morphology, allowing users to accurately calculate the wear rate and determine the failure mode at different stages using one test sample.
Low Load Vickers Hardness Measurement
During Vickers Hardness inevitable user errors are introduced during the measurement of the imprint under the microscope. Especially at low loads, small measurement errors of the indent size will produce large hardness deviations. In comparison, nanoindentation testing evaluates the mechanical properties of a material by driving the indenter tip into the test material and precisely recording the evolution of load and displacement of the tip. It avoids user errors in imprint size measurement.
ICMCTF 2016 San Diego | Vist With Nanovea
Visit Nanovea this week at ICMCTF. For more information or to request guest passes please Contact Nanovea.
Control 2016 Stuttgart | Visit Booth 7220/1 Hall 7
Learn more about Nanovea at Control 2016 this week at booth 7220/1 Hall 7 in Stuttgart Germany April 26th – 29th.
American Coatings Show 2016 | Visit Nanovea @ Booth 2773
Visit Nanovea at American Coatings Show 2016 booth 2773. The Jr25 Profilometer will be displayed on-site for live demos. For more information or to request guest passes please Contact Nanovea.