With a focus on particle impact wear testing, the test lab is driving innovation forward at TLT-Turbo as the results help improve product reliability, quality and performance in their final operating environment.

Patrick Baumgärtner, a research and development engineer and expert in wear and corrosion protection at TLT-Turbo, has played an instrumental role in building up the test lab to its current capabilities. Together with Sabine Groh, industrial fans product manager at TLT-Turbo, they have been spearheading the current research.

Currently, the core field of research at the test lab is the testing of new wear-resistant materials and coatings for fan components. Mr Baumgärtner says that the testing takes place in the lab’s solid particle impact wear test bench. There, various types of dust or abrasive particles are blasted onto the test material, varying the angle and speed of the blasting to observe the resulting wear.

Mr Baumgärtner explained: “We also carry out caking tests in which we select, for example, anti-adhesive layers for our fans, in order to find suitable solutions for customer applications. A further main focus is the analysis of process residues that can have an abrasive or corrosive effect. Here the composition, size distributions, pH value and conductivity in the eluate are determined.”

TLT-Turbo’s approach is to continuously test materials, coatings and components in order to produce fan components that are designed for performance excellence in any operating environment – no matter how abrasive.

This testing is applied to current and new products in development but also to samples that are brought in from client sites in order to establish the wear patterns caused by specific environments. In this way, TLT-Turbo is able to provide each client with a customised solution that will last longer and require less maintenance.

The test lab now offers facilities for metallography, a stereomicroscope, a pycnometer for determining the density of materials and coatings, and an automated solid particle impact wear test bench.

Mr Baumgärtner said: “The capabilities of the test lab open a lot of doors for advanced research that will make a positive contribution to the engineering community at large as well. Under my supervision, studies and thesis research takes place in the laboratory in cooperation with local colleges and universities. For me, this is the basis for successfully researching and developing new solutions in our field.”

According to Ms Groh, the test lab has almost endless possibilities for the improvement of product delivery to clients: “Our customers are often operating TLT-Turbo fans in abrasive and/or corrosive environments. To develop suitable solutions that match the wear resistance against particle impact we use our automated solid particle impact test bench. Compressed air accelerates a defined mass flow of abrasive particles to velocities up to 300m/s and propels them onto a piece of sample material.

“This leads to material loss and wear that we can examine. It is even possible to use original dust from a customer’s plant to evaluate the most suitable solution for them. By varying the impact angle, we can observe system characteristic wear curves. With this knowledge we can provide customised solutions for many processes.”

These customised solutions can be best illustrated in the selection of coatings. This, says Ms Groh, has an immensely positive impact for TLT-Turbo clients.

She said: “If we were to propose a new coating for a customer, the wear rate of the coating would be determined first. That is the main scientific-based decision criteria for wear resistant coatings. If the coating has a superior wear rate compared to other coatings, or at least a wear rate that is on par with other coatings and another beneficial quality such as anti-stick effect, corrosive resistance or a cost advantage, it will be implemented into TLT´s coating portfolio.”

Ms Groh said that they have also conducted tests that have led to the development of completely new proprietary coatings: “During the manufacturing process, coatings were tested to see the influence of welding heat on coating qualities – such as the development of cracks – to ascertain how to avoid damage caused by heat or weld splashes. We conducted research and testing on combining welded coatings and thin layer coating into a Hybrid Coating which can dramatically increase the operational lifespan of TLT-Turbo fans at their clients’ plants.”

This is just one example of how TLT’s testing capability can positively impact ventilation systems across all applications.

Mr Baumgärtner acknowledges: “Due to the broad database of wear tests on various materials and coatings, we are able to offer tailor-made wear protection solutions for various processes of our customers.”

Ms Groh agrees, adding that the wide variety of chemical compositions and coating conditions such as acceleration of coating powder and heat development make it extremely difficult to objectively find the best coating by carrying out testing at a customer plant.

She commented: “The process of reaching initial findings in these conditions is very time consuming. In addition to this, there is a broad variety of conditions to contend with at different customer plants that hinder an accurate comparison of different coatings at different plants. If you test different coatings on one machine you might get a rough estimation of what coating is superior, however different wear rates of coating cause imbalances in the impeller and vibrations at the fan.”

She elaborates by explaining that finding a precise comparative measurement on different coatings is impossible without being able to analyse how the wear rate changes at different angles, adding: “At the test lab we can control the conditions to find precisely what we are looking for in a shorter time-frame. Additionally, we are able to replicate the fan’s operating environment. We can run tests using dust collected from the client site while simulating particle speeds that match the client’s environment to precisely simulate wear rates.”

In the laboratory environment, the TLT-Turbo team is also able to determine additional coating properties as they have the capability to run additional experiments, e.g. corrosive resistance, anti-stick effect, robustness, heat resistance, suitable application methods, and combination possibilities like hybrid coatings.

The test lab has afforded TLT-Turbo engineers a deeper understanding of the mechanisms behind wear and the effects of specialised solutions. This has led to new approaches in product advancement and developments that are grounded in providing solutions that meet market requirements.

Mr Baumgärtner said: “The analysis of residues from plants has a great influence on product development as we are making more informed decisions when choosing materials for corrosive and abrasive environments.”

This has also had an impact on TLT-Turbo’s aftermarket service offering. The test lab, has allowed for new customer services to be generated, such as the performance of specific tests for customers.

Ms Groh concluded: “The development of new solutions for specific customer problems is now much faster and more accurate. Also, the suitability of low-cost approaches or solutions that allow for wear induced damages to be repaired on-site integrate effortlessly into TLT-Turbo’s existing solutions.”

The test lab enables TLT to continuously improve its solution portfolio for different customer problems with a focus on wear. The combination of understanding the client’s exact requirements and challenges and having a tool that allows engineers to find the best solutions from a scientific basis are a key factor for success in the market and play an important role for TLT-Turbo’s on-going product development and quality client delivery.