Category: Application Notes
Corrosion Effect On Hardness Using Nanoindentation
The mechanical properties of materials deteriorate during the corrosion process. For example, lepidocrocite (γ-FeOOH) and goethite (α-FeOOH) form in the atmospheric corrosion of carbon steel. Their loose and porous nature results in absorption of moisture and in turn further acceleration of the corrosion process ii . Akaganeite (β-FeOOH), another form of iron
oxyhydroxide, is generated on the steel surface in chloride containing environmentsiii . Nanoindentation can control the indentation depth in the range of nanometers and microns, making it possible to quantitatively measure the hardness and Young’s modulus of the corrosion products formed on the metal surface. It provides physicochemical insight in corrosion mechanisms involved so as to select the best candidate material for the target applications.
Drywall Texture & Pitting Using 3D Profilometry
Drywall texture and roughness is critical in the final products quality and appearance. A better understanding of the effect of surface texture and consistency on the moisture resistance of the coated drywall allows selecting the finest product and optimizing the painting technique to obtain the best result. Quantifiable, fast and reliable surface inspection of the coating surface is in need for quantitative evaluation of the surface quality. The Nanovea 3D Non-Contact Profilometers utilizes chromatic confocal technology with unique capability to precisely measure the sample surface. The line-sensor technique can finish scanning a large drywall surface in minutes.
Machining Finish Quality Using 3D Profilometry
Machining finish is a result of different cutting techniques exhibiting different surface features. Flatness, roughness and texture of a cut/machined surface is vital to its end use. Accurate clean cut reduces the further work on grinding and rough edge removal. For example, when marble tiles are manufactured, inaccurate and rough cutting may lead to mismatch during the tile floor installation. Quantitative measurement of the surface texture, consistency, roughness and others is critical in improving the cutting/machining processing and quality control measures.
Grooved Stent Coating Failure Using Nano Scratch Testing
Drug–eluting stent 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 again. One of the major concerns is the delamination of the polymer coating that carries the drug-eluting layer from the metal stent substrate. In order to improve the adhesion of this coating to the substrate, the stent is designed in different shapes. Specifically in this study, the polymer coating locates at the bottom of the groove on the mesh wire, which brings enormous challenge to the adhesion measurement. A reliable technique is in need to quantitatively measure the interfacial strength between the polymer coating and the metal substrate. The special shape and the small diameter of the stent mesh (comparable to a human hair) require ultrafine X-Y lateral accuracy to locate the test position and proper control and measurement of the load and depth during the test.
Coating Inspection of TIN by Scratch Testing
Coating inspection of residual stress in protective PVD/CVD coatings plays a critical role in the performance and mechanical integrity of the coated component. The residual stress derives from several major sources, including growth stress, thermal gradients, geometric constraints and service stresses. The thermal expansion mismatch between the coating and the substrate created during coating deposition at elevated temperatures leads to high thermal residual stress. Moreover, the TiN coated tools are often used under very high concentrated stresses, e.g. drill bits and bearings. It is critical to develop a reliable quality control process to quantitatively inspect the cohesive and adhesive strength of the protective functional coatings.
Tribology Inspection of Titanium Nitride Coatings By Tribometer
Wear of the tools in service creates loss of dimensions and functionality of the tools. It has significant influence on the tool life, as well as the surface integrity and dimension accuracy of the finished products. The tribo-mechanical properties of the protective ceramic coatings can substantially enhance the service performance and lifespan of the machine tools. Reliable and accurate tribology inspection of such protective coatings becomes vital to ensure quality performance of the tools.
Roughness Mapping Inspection Using 3D Profilometry
Surface defects of products derive from materials processing and product manufacturing. In-line surface quality inspection ensures the tightest quality control of the end products. The Nanovea 3D Non-Contact Profilometers utilize chromatic confocal technology with unique capability to determine roughness mapping of a sample without contact. The line sensor enables scanning the 3D profile of a large surface at a high speed. The roughness threshold calculated real-time by the analysis software serves as a fast and reliable pass/fail tool.
Block on Ring Tribometer Option
Block on Ring test is a widely used technique that evaluates the sliding wear behaviors of materials in different simulated conditions, allows reliable ranking of material couples for specific tribological applications. Sliding wear often involves complex wear mechanisms taking place at the contact surface, such as adhesion wear, two-body abrasion, three-body abrasion and fatigue wear. The wear behavior of materials is significantly influenced by the work environment, such as normal loading, speed, corrosion and lubrication. A versatile tribometer that can simulate the different realistic work conditions will be ideal for wear evaluation.
Compression Set Measurement With 3D Profilometry
Compression set measurement of rubbers progressively recover their shape after the compressive stress is removed. Accurate in situ monitoring of the shape evolution during the compression set period can provide important insight into the mechanism of material recovery. Moreover, real-time monitoring of surface morphologies is very useful in various materials applications, such as paint drying and 3D printing. The Nanovea 3D Non-Contact Profilometers measure the surface morphology of materials without touching the sample, avoiding introducing additional scratches or shape alteration which may be caused by contact technologies such as sliding stylus.
Stress Relaxation Measurement With Nanoindentation
As per ASTM E 328, Standard Test Methods for Stress Relaxation for Materials and Structures, external force is initially applied on the material or structure to reach a constant constraint, and then the change in the external force necessary to maintain this constraint is measured as a function of time. The major difficulty in the stress relaxation test is maintaining the constant constraint. The nanoindentation module of Nanovea Mechanical Tester accurately measures the stress relaxation by applying the close loop control of the load with ultra-sensitive load cell and piezo. The piezo reacts real-time to keep the constraint constant while the change in load is measured and recorded by the high precision load cell. This measurement can be performed on virtually all types of materials without the stringent requirement of sample dimension. Multiple stress relaxation tests can be performed on the same flat sample to ensure the test repeatability, which substantially reduces the cost on sample manufacturing and machining.