MECHANICAL COMPONENTS FEATURE


The positive properties of ceramic


components The robust material of ceramics is


Abrasive wear can be extremely damaging – it can change the critical dimensions and tolerances of a component, cause


machinery and equipment to rapidly deteriorate in performance, and ultimately cause machine failure and productivity loss. For those looking to reduce the effects of wear and abrasion, there are now standard components made from ceramics specifically designed for the task, as Marcus Schneck from norelem explains


H


igh-performance ceramics are becoming increasingly important,


especially in manufacturing where they enable a longer life cycle to be achieved and a wide range of requirements to be met. Ceramic materials are temperature resistant and hygienic, enabling their use for mechanical engineering, as well as the automotive industry, the food and pharmaceutical industry, and circuit board manufacturing. The technical ceramics market is expected to grow by 9.3% annually between 2020 and 2027 due to the demand for durable and high temperature resistant materials.


PREVENTING WEAR Wear is the progressive loss of material from the surface of a solid body as part of mechanical processes – for example, contact and relative movement of a solid, liquid or gaseous counter body. Meanwhile, abrasion is the removal of material through furrowing and scoring stress. There are two basic forms of abrasive


wear: two-body abrasion and three-body abrasion. A simple description of two- body abrasion would be a hard, rotating surface cutting into a soft, fixed surface. And three-body abrasion can be explained as a hard particle moving between two surfaces. If the wear of a


component is not recognised in time and it subsequently breaks or fails, damage can also occur to adjacent parts and machinery – resulting in unscheduled downtime and


Designed to endure the harshest environments, norelem’s comprehensive range of ceramic products have been developed with service life in mind


production standstill. Difficult operating conditions or very long turnaround intervals can lead to severe wear on the surface of the components if the correct material isn’t being used. For example, locating pins, which are


frequently used in the positioning of metal sheets, are exposed to increased abrasion within special operating conditions. Progressive material removal when inserting the sheets can influence the positioning accuracy of the fixture, requiring ceramic material to be used.


CONSIDERING CERAMICS The positive properties of ceramic components are endless: the high dimensional stability, flexural strength and wear resistance, to name just a few. Components made of high-performance ceramics operate with high precision, showing almost no signs of wear even under heavy use. In many applications where the


The positive properties of ceramic components are endless: the high dimensional stability, flexural strength and wear resistance, to name just a few


robustness of the components is important, those made of high- performance ceramics is worthwhile. The higher procurement costs are more than offset by the longer service life. Ceramic also has a thermal and electrically insulating effect, an advantage in all applications where there is a risk of electric breakdown. In addition, high-performance ceramics feature a low adhesion tendency in contact with metals, providing a longer life cycle of the component if mixed with metal counterparts.


/ DESIGNSOLUTIONS


also a good choice for applications with high mechanical loads due to its high flexural strength and hardness. Thanks to the mechanical strength and low density, tools made of ceramics work precisely, reliably and are wear-free over a long period of time, even under the highest loads. Ceramic products are also food-safe


and offer high resistance to acids, alkalis and vapors. They are generally insensitive to chemicals, are pressure- resistant and temperature-stable, and thus defy frequent and intensive cleaning processes or maintenance. This makes them ideal components to use in food and beverage and healthcare industries, where chemicals and acidic solutions are used regularly.


AVOIDING ABRASION Introducing ceramic standard components into your design process also brings another benefit – it allows an increase in operating temperatures if needed, potentially speeding up the production process and creating more components in a shorter timeframe. The issue of corrosion is also


dramatically reduced, meaning machine parts need to be serviced and replaced much less frequently due to the durability of the component. Especially for demanding applications, engineers should not shy away from the higher prices – components made of high- performance ceramics literally ‘pay off’ in the medium and long term. Wear and abrasion are a constant


challenge for the manufacturing industry, with a wide range of environments that machine parts and components must endure – therefore engineers have numerous material considerations before production kicks off. Designed to endure the harshest


environments, norelem’s comprehensive range of ceramic products have been developed with service life in mind. Even under high levels of mechanical stress, these are highly robust and suitable under extreme conditions, helping engineers extend the life of their machines.


norelem www.norelem.co.uk


DESIGN SOLUTIONS | APRIL 2021 35


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