{"id":21976,"date":"2023-06-19T15:28:52","date_gmt":"2023-06-19T07:28:52","guid":{"rendered":"https:\/\/www.meetyoucarbide.com\/?p=21976"},"modified":"2023-06-19T15:28:52","modified_gmt":"2023-06-19T07:28:52","slug":"the-4-you-should-know-points-about-powder-metallurgy","status":"publish","type":"post","link":"https:\/\/www.meetyoucarbide.com\/tr\/the-4-you-should-know-points-about-powder-metallurgy\/","title":{"rendered":"Toz Metalurjisi Hakk\u0131nda Bilmeniz Gereken 4 Nokta"},"content":{"rendered":"
Powder metallurgy has the advantages of low energy consumption, high material utilization, and high efficiency, which can save time. However, it also has certain limitations, such as high costs for metal powders and molds, limitations on product size and shape, and relatively poor product toughness.<\/p>\n

Currently, PM is widely used in the production of hard alloys, porous materials, refractory metals, magnetic materials, and metal ceramics.<\/p>\n

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The History of Powder Metallurgy<\/h1>\n

The development of PM can be divided into three stages:<\/p>\n

In the early 20th century, the production of tungsten filaments for electric lamps using PM processes was considered a milestone in the development of modern powder metallurgy technology. Subsequently, many refractory metals such as tungsten, tantalum, niobium, etc., could be prepared using PM methods.<\/p>\n

The birth of powder metallurgy hard alloys in 1923 was also regarded as a revolution in the mechanical processing industry. In the 1930s, the PM process successfully produced copper-based porous oil-impregnated bearings.<\/p>\n

The development then extended to iron-based mechanical parts, which were rapidly applied in various modern manufacturing fields such as automotive, textile, and office equipment. In the mid-20th century, powder metallurgy technology began to integrate with disciplines such as chemistry, materials, and machinery, leading to the development of higher-performance new materials and processes, further promoting the advancement of powder metallurgy.<\/p>\n

This integration also resulted in the widespread application of PM technology in fields such as automotive, aerospace, defense industry, energy conservation, and environmental protection.<\/p>\n

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Basic Process of Powder Metallurgy<\/h1>\n

(1)Preparation of powder<\/p>\n

Currently, powder production methods can be broadly classified into two categories: mechanical methods and physicochemical methods.<\/p>\n

Mechanical methods involve mechanically crushing the raw materials, with minimal changes in chemical composition.<\/p>\n

Physicochemical methods, on the other hand, utilize chemical or physical actions to alter the chemical composition or aggregation state of the raw materials to obtain powders.<\/p>\n

The most widely used powder production methods in industrial applications are atomization, reduction, and electrolysis methods. Deposition methods (gas phase or liquid phase) are also important in specific applications.<\/p>\n

(2)Powder forming.<\/p>\n

Forming is the process of compacting metal powders into a solid block with a certain shape, size, porosity, and strength. Forming can be classified into two categories: conventional compaction and special forming.<\/p>\n

Conventional compaction involves placing metal powders or mixtures into a steel mold and applying pressure to the powders using punches. After pressure is released, the compacted part is ejected from the mold.<\/p>\n

Special forming methods have emerged as various industrial sectors and scientific technologies have advanced, demanding higher requirements for the properties, dimensions, and shapes of PM materials and products.<\/p>\n

Currently, special forming methods include isostatic pressing, continuous forming, injection molding, high-energy forming, and more.<\/p>\n

(3)Block sintering<\/p>\n

Sintering is the phenomenon or process that occurs when powders or powder compacts are heated under appropriate temperature and atmospheric conditions. Sintering can be divided into monophase sintering and multiphase solid-state sintering.<\/p>\n

In monophase sintering, the sintering temperature is lower than the melting point of the metal or alloy used. In multiphase solid-state sintering, the sintering temperature generally falls between the melting points of the low-melting component and the high-melting component.<\/p>\n

In addition to conventional sintering, there are also special sintering methods such as activated sintering and hot pressing sintering.<\/p>\n

(4)Post processing of products<\/p>\n

Depending on the specific performance requirements of the product, additional processing treatments are commonly applied to sintered parts. These treatments include oil impregnation, precision finishing, thread cutting, heat treatment, electroplating, and more.<\/p>\n

3pros and cons of powder metallurgy<\/h1>\n

Advantages of powder metallurgy:<\/h2>\n