The National Abrasives Standardization Technical Committee and the 7th Working Conference were held in Zhuhai City, Guangdong Province from November 27 to December 1, 2018, and ended successfully on December 1.
Member and consultant of the National Abrasives Standardization Technical Committee and members of the four sub-technical committees, observers and related representatives of ordinary abrasives, ordinary abrasive tools and silicon carbide special products, super-hard abrasives and products, coated abrasives A total of more than 130 people attended the meeting. Our Henan Yuxing Micro-Drilling Co., Ltd. was invited to participate in this event.
According to the overall work arrangement of this meeting, on the 28th, Professor Mei Mei conducted standardization training for all the staff. On the 29th, Secretary-General Bao Hua made a detailed report on the work and financial revenue and expenditure of the Sixth Standardization Committee at the meeting. On the 30th, the four chapters reviewed the revised standards and the 2019 special standards, and finally the conference was successfully concluded.
Alnico Magnets are traditionally classified using numbers assigned by the Magnetic Materials Producers Association (MMPA), for example, Alnico 3 or Alnico 5.
Alnico magnets are produced by casting or sintering processes.[8] Anisotropic alnico magnets are oriented by heating above a critical temperature and cooling in the presence of a magnetic field. Both isotropic and anisotropic alnico require proper heat treatment to develop optimal magnetic properties-without it alnico's coercivity is about 10 Oe, comparable to technical iron, which is a soft magnetic material. After the heat treatment alnico becomes a composite material, named "precipitation material"-it consists of iron- and cobalt-rich[9] precipitates in rich-NiAl matrix.
Alnico's anisotropy is oriented along the desired magnetic axis by applying an external magnetic field to it during the precipitate particle nucleation, which occurs when cooling from 900 °C (1,650 °F) to 800 °C (1,470 °F), near the Curie point. Without an external field there are local anisotropies of different orientations due to spontaneous magnetization. The precipitate structure is a "barrier" against magnetization changes, as it prefers few magnetization states requiring much energy to get the material into any intermediate state. Also, a weak magnetic field shifts the magnetization of the matrix phase only and is reversible.
Alnico magnets are ideal for high temperature applications up to 550ºC
. Cast Alnico Magnet is very stable, has good corrosion resistance and a typical hardness of 50 Rockwell C. Once cast, the material is so hard that the only machining possible is grinding
. Cast Alnico Magnet represents the most versatile magnet material available. The range of properties can be accurately designed for specific applications by changes to element analysis and heat treatment.
Cast Alnico Magnet
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