What are the advantages of ceramic-metallic pumps over metal pumps?

Thread Content

Due to the lower mechanical properties of non-metallic materials such as ceramics, including indicators like tensile strength, bending strength, and impact toughness, compared to metallic materials, non-metallic ceramic pumps have a lower pressure resistance; generally, the pressure resistance of the casing of such pumps is ≤1.6 MPa. Glass fibers or carbon fibers can be added to materials such as engineering plastics to enhance their mechanical strength. For example, polypropylene has a tensile strength of 30–38 MPa and a flexural strength of 38–55 MPa; after being reinforced with glass fibers, its tensile strength increases to 60–80 MPa and its flexural strength rises to 80–100 MPa. Compared to metals, ceramic non-metallic materials exhibit excellent corrosion resistance; they are free from corrosion forms such as crevice corrosion, pitting corrosion, selective corrosion, and galvanic corrosion that occur in metals. Among non-metallic materials with good wear resistance, in addition to wear-resistant rubber and new high-functional engineering plastics (such as ultra-high molecular weight polyethylene and polyvinylidene fluoride), there are also industrial ceramics. Industrial ceramics (such as corundum ceramics and silicon nitride ceramics) have the best wear resistance (with a Mohs hardness of 9), but their drawback is that they are fragile and prone to cracking. In summary, compared to metal pumps, ceramic pumps exhibit better wear resistance and corrosion resistance; they have excellent resistance to acid corrosion and wear, are low in cost, and provide good sealing performance. They are thus very suitable for transporting purified circulating dilute acid in sulfuric acid production, and their use can yield good economic benefits.