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Research on metal 3D printing technology and special powder (4)

Categories: ZCMIM NewsStars: 3StarsVisit: -Release time: 2019-11-05 08:39:00
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3. 3D printing materials breakthrough is basis of development

3D printing materials are an important material basis for developing 3D printing technology. To some extent, development of materials determines whether 3D printing can be applied more widely. At present, 3D printing materials mainly include engineering plastics, photosensitive resin, rubber materials, metal materials and ceramic materials, etc. In addition, color gypsum materials, artificial bone meal, cell biological materials, sugar and other food materials have also been applied in 3D printing. These raw materials used in 3D printing are specially developed for 3D printing equipment and technology, which are different from ordinary plastics, gypsum, resin and so on. Their forms generally include powder, silk, lamellar, liquid and so on.

4. Metal powder

Metal powder used in 3D printing generally requires high purity, good sphericity, narrow particle size distribution and low oxygen content. Currently, metal powder materials used in 3D printing mainly include titanium alloy, cobalt-chromium alloy, stainless steel and aluminum alloy, etc. In addition, there also have gold, silver and other precious metal powder materials used in printing jewelry. As most important link of 3D printing metal industry chain, 3D printing metal powder is also biggest value.

Titanium alloy

Titanium alloy has advantages of high temperature resistance, high corrosion resistance, high strength, low density and biocompatibility. It has been widely used in aerospace, chemical industry, nuclear industry, sports equipment and medical equipment. Titanium alloy parts prepared by traditional forging and casting technology have been widely used in field of high and new technology. Amount of titanium used in a Boeing 747 aircraft has reached 42.7t. However, due to high product cost, complex process, low material utilization rate and subsequent processing difficulties and other adverse factors, hinder more extensive application of traditional forging and casting methods to produce titanium alloy parts. Metal 3D printing technology can fundamentally solve these problems, so it has become a new technology to directly manufacture titanium alloy parts in recent years. 

Stainless steel

Stainless steel has good chemical corrosion resistance, high temperature resistance and mechanical properties. Due to its good powder molding property, simple preparation process and low cost, it is the earliest material applied in 3D metal printing. Current research focuses on reducing porosity, increase strength and spheroidization mechanism of metal powder during melting.

High temperature alloy

Superalloy is a kind of metal material based on iron, nickel and cobalt, which can work for a long time at a temperature above 600℃ and under a certain stress environment. It has high temperature strength, good thermal corrosion and oxidation resistance, and good plasticity and toughness. At present, according to type of alloy matrix, it can be divided into three kinds: iron base, nickel base and cobalt base alloy. NASA claims that a 3d-printed rocket engine nozzle generated a record of 9t thrust during a high-temperature ignition test on Aug. 22, 2014.

Magnesium alloy

As lightest structural alloy, magnesium alloy has potential to replace steel and aluminum alloy in many applications due to its high strength and damping properties. For example, lightweight application of magnesium alloys in automotive and aircraft components can reduce fuel use and emissions. Magnesium alloys have situ degradability, low young's modulus, strength close to human bone, excellent biocompatibility, and more promising application prospects in surgical implantation than traditional alloys.


Keywords in the article: metal 3D printing special powder
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