is used to perform a variety of processes. This includes preparation of samples and preparing them for scanning. Preparation techniques include metallographic planar grinding and polishing. These processes are used to remove roughness from samples during the scanning process. Another process is the use of polishing cloths.
Metallographic planar grinding is to remove roughness from the metallographic cutting process
The purpose of metallographic planar grinding is to remove roughness and create a smooth, flat surface on the metallographic cut. This process is critical to the success of the metallographic cutting process and requires a good grinding result to achieve this goal. It is necessary to use a low-speed grinding holder to achieve the desired total removal depth.
Metallographic planar grinding is important to the metallographic cutting process for various reasons. First, it removes roughness that is left over from the sectioning process. Additionally, it establishes a common plane for all specimens in the holder. The most common materials used for planar grinding are alumina and silicon carbide abrasive papers. However, conventional alumina and silicon carbide grinding stones can also be used for this purpose. Both types of abrasive papers have different abrasive characteristics that affect their cutting performance.
Metallographic planar grinding can produce flat surfaces on nearly any metal or alloy material. The process involves several stages where a finer grade of paper is used to remove scratches and roughness left by the previous coarser grade. In between stages, the specimen must be washed with soapy water to prevent contamination by coarser grit. Afterwards, the specimen must be dried using a hot air dryer. An ultrasonic bath may also be used to clean the specimen, but it is not necessary.
Metallographic polishing cloths are used to achieve flatness of the ground surfaces
Metallographic polishing is a common procedure used to achieve high-quality ground surfaces. The method typically involves the use of cloths with a low impact elasticity and a lubricant. This low impact elasticity is critical to maintaining sharp edges; too soft a cloth can dull the edge and affect evaluation of thin layers. Higher impact elasticity and viscosity cloths are used for the final polishing. Intermediate polishing is usually carried out between the two extremes, but a range of options exists.
Metallographic polishing cloths are used for a variety of applications. Some materials are more critical than others, such as titanium fasteners. These materials may require a different approach, including the addition of an attack polishing agent. There are several tips and tricks for metallographic preparation that vary by industry niche. This article attempts to clarify the key factors that go into an effective metallographic preparation. Please feel free to leave comments and suggestions.
Metallographic polishing cloths are made of wool. A high-nap wool polishing pad is typically used for final polishing. These polishing cloths are used for achieving flatness of the ground surfaces of metals. They also serve as an excellent barrier between metal and soft pads.