About the installation of ceramics
The wear-resistant ceramics embedded in our company adopt a dovetail groove inlaid structure and are fixed with strong adhesives. Although this process is troublesome to process, it can achieve perfect connection of the ceramic pieces along the gaps in the direction of the dovetail groove.
Since the development of this product so far, no ceramic shedding has occurred. The company has fully considered the volume and weight of the ceramic when designing the ceramic block. Even if individual ceramic pieces are damaged, it will not affect the overall dynamic balance of the impeller.
How to solve the problem of heavy wear and tear?
The wear-resistant ceramics produced by our company are one of the most wear-resistant industrial materials currently. They adopt new research results that have won the third prize for scientific and technological progress and have excellent wear resistance. Its core is to control three main factors: raw material selection, powder preparation and sintering;
1. The raw materials are high-purity phase alpha alumina and crystal growth inhibitors;
2. The powder adopts a relatively advanced powder preparation process, and the granulated powder produced is evenly distributed and has good fluidity;
3. Strict sintering process and precise temperature control. This technology can effectively inhibit the growth of crystals and reduce the generation of internal pores, thereby forming a very dense sinter.
The impact of adding wear-resistant ceramics on the overall performance of the impeller
The weight of the entire porcelain block is about 58Kg. Excluding the weight reduction of the impeller metal body due to metal material processing, the weight of the entire impeller will increase by about 5Kg compared with the original impeller after the production is completed;
Since the shape of the original fan is basically not damaged after the installation of wear-resistant ceramics, the impact on the flow rate of the fan after the installation of wear-resistant ceramics is negligible.
How to solve the problem of ceramic peeling off at high temperatures?
The fan impeller runs at a high temperature of 200°C for a long time. Most anti-wear manufacturers use traditional epoxy resin-based organic adhesives. This type of viscose is mainly composed of organic ingredients, is not resistant to high temperatures, and is prone to aging. It cannot meet the requirements of long-term operation. Even if it is installed with dovetail groove or spot welding, once it is operated at ultra-high temperature for a long time, the adhesive will easily age, become brittle and become crushed.
Our company uses adhesive and dovetail slots for double fixation. The high-temperature-resistant inorganic adhesive used has excellent adhesion, processability and thixotropy to steel and ceramics; it can be cured at room temperature; it has a very high Strength and toughness; high heat resistance and aging resistance. This method is mature and reliable. Under the operating temperature of -50℃~500℃, the liner will not age or fall off after long-term operation.
How to solve the problem of fan falling off caused by vibration and transportation?
The fan impeller experiences strong vibrations during operation, which requires the adhesive not only to have strong shear strength, but also to have strong earthquake resistance, otherwise the ceramic sheets will peel off under vibration. The adhesive we use has high shear strength (2.5MPa), which can largely protect the ceramic from falling off under strong vibrations.
How to solve the impact of sudden heating and cooling on ceramics during startup or shutdown?
When the unit is started or shut down, it will encounter sudden heat and cooling. The thermal expansion coefficients of ceramics and steel are inconsistent. In addition, the organic adhesive is brittle, which can easily cause the entire ceramic to peel off. To address this problem, our company has specially improved the inorganic adhesive so that its thermal expansion coefficient is between steel and ceramics (9×10-6m/m.K). At the same time, the microfiber structure of the adhesive can be well adjusted due to The extrusion of ceramics caused by the inconsistent thermal expansion of ceramics and steel greatly ensures that the ceramics will not fall off during long-term operation in various harsh environments.
How to solve the ceramic gap problem?
We use mature technology to ensure that the ceramic gap is no more than 1mm. At the same time, in order to avoid forming a gap along the wind direction and perpendicular to the wind direction, we use the dislocation pasting method to install the wear-resistant ceramics. It can avoid erosion of ceramic gaps along the wind direction and achieve small gap docking.
