stent-coating-failure

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.

Stent Coating Failure Using Nano Scratch Testing

rotational-profilometry

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.

Rotational Measurement Using 3D Profilometry

3d-wear-track

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.

3D Wear Track Scan In Situ on Tribometer

low-load-vickers

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.

Low Load Vickers Hardness Measurement Using Nanoindentation

icmctf-2016

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

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

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.

American Coatings Show 2016

Low Temperature Tribology

Low Temperature Tribology

A reliable measurement of low temperature tribology, static and dynamic coefficient of friction, COF, as well as wear behavior is needed in order to better understand the tribological performance of materials for sub-zero applications. It provides a useful tool to correlate the frictional property with the influence of various factors, such as reactions at the interface, interlocking surface features, cohesion of surface films, and even microscopic solid static junctions between surfaces at low temperatures.

Low Temperature Tribology of Rubber

contour analysis

Gear Contour Analysis

Manufacturing of high precision gears requires stringent quality control, in order to obtain the best operational conditions and energy efficiency. Surface defects on the gears may lead to negative impact on the gear mesh quality. Moreover, during the service time, wear and tear takes places, creating surface defects such as dents and cracks in the gears that may result in decreased power transmission efficiency and potential mechanical failure. An accurate and quantifiable tool for surface inspection is in need. Unlike a touch probe technique, the Nanovea Profilometer performs 3D contour analysis of the sample without touching, making it possible to precisely scan samples with a complex shape, such as gears of different geometry.

Contour Analysis of a Worn Gear Using 3D Profilometry

macro scratch adhesion

Macro Adhesion Failure of DLC

bits and bearings. Under such extreme conditions, sufficient cohesive and adhesive strength of the coating/substrate system becomes vital. In order to select the best metal substrate for the target application and to establish a consistent coating process for DLC, it is critical to develop a reliable technique to quantitatively assess cohesion and adhesion failure of different DLC coating systems.

Cohesive & Adhesive Strength of DLC Using Macro Scratch Testing