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  • Determination of Water Hardness
    Originally the hardness of water was defined as the capacity of water for destroying the lather of soap. The hardness was determined by a titration with a standard soap solution. Metal ions including have the ability to cause hardness. However, today water hardness means the total calcium
  • Rockwell Hardness Testers
    The Rockwell test method is defined in ASTM E-18 and is the most commonly used hardness tester operation method since it is generally easier to perform and more accurate than other types of hardness testing. Rockwell hardness testers can be used on all metals except in conditions where the test
  • Precious Metals
    , electrodes, cathodes, crucibles, catalysts, and salts or solutions for plating and coating. All precious metals are nearly completely corrosion resistant; platinum metals withstand service up to 3,200 F without any evidence of erosion or corrosion. An extremely soft, ductile metal, gold undergoes
  • Vickers and Knoop Hardness Testers
    specifies a range of loads between 1 to 1000 gf. There are two types of indenters, a square base pyramid shaped diamond for testing in a Vickers tester and a narrow rhombus shaped indenter for a Knoop tester. The micro-hardness methods are used to test on metals, ceramics, and composites - almost any type
  • Refractory Hard Metals
    Refractory hard metals (RHMs) are a ceramiclike class of materials made from metal-carbide particles bonded together by a metal matrix. Often classified as ceramics and sometimes called cemented or sintered carbides, these metals were developed for extreme hardness and wear resistance. The RHMs
  • Portable Hardness Test Technology for Assessing Titanium Weld Quality (.pdf)
    Portable hardness testing technology was developed in this project and was based on an oxygen equivalent (OE) database for CP titanium weld metals. The database was created by testing the properties of full penetration autogenous welds made from a number of heats and using different welding
  • Hardness Testing of Metallic Materials - NIST Recommended Practice Guide
    used method for acceptance testing and process control of metals and metal products. Since its development, the popularity of the Rockwell hardness test has steadily grown. The Rockwell hardness test continues to be applied as a tool for assessing the properties of a product while the tolerances
  • Metal Carbides (WC, TiC)
    Carbides are compounds of a metal or metalloid (B, Si) and carbon. Metal carbides are also known as hard metals such as tungsten carbide (WC), titanium carbide (TiC) or tantalum carbide (TaC). Metal carbides have high hardness and high hot hardness, which makes them useful for cutting tools

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