1.Dongguan Precision CastingSequential solidification technology The so-called sequential solidification technology is to discharge the heat of the liquid metal in a certain direction, or to perform rapid solidification of the liquid metal in a certain direction, so that the growth (solidification) of the crystal grains proceeds in a certain direction, and finally obtains the A process method for castings with unidirectional grain structure or single crystal structure. Due to the continuous advancement of cooling and control technology, the intensity and directionality of heat discharge are continuously improved, thereby increasing the temperature gradient in the liquid phase at the front of the solid-liquid interface, which not only improves the directionality of grain growth, but also makes the structure finer. Long, straight, and extend the orientation zone. Sequential solidification technology has been widely used in the production of cast superalloy gas turbine blades. Due to the excellent mechanical properties of the structure grown along the orientation, the operating temperature of the blades is greatly increased, so that the aero engine Improved performance. The latest development of sequential solidification technology is the production of single crystal castings, such as single crystal turbine blades, which have higher working temperature, thermal fatigue strength, creep strength and corrosion resistance than general sequential solidification columnar crystal blades. The aeroengine using this kind of superalloy single crystal blade effectively increases the thrust and efficiency of the aeroengine, and greatly improves its performance.

2.Dongguan Precision CastingRapid solidification technology is a process that transforms liquid alloys into solids under cooling conditions (103-109 K/S) much faster than the cooling rate (10-4-10K/S) under conventional process conditions. It enables the alloy material to have excellent structure and properties, such as very fine grains (usually< 0.1-0.01="" um=""> even nano-level grains), alloy element segregation defects and highly dispersed ultrafine precipitates , High strength and high toughness of the material. The rapid solidification technology allows the liquid metal to break away from the conventional crystallization process (nucleation and growth) and directly form a solid material with an amorphous structure, the so-called metallic glass. This type of amorphous alloy has a long-distance disordered structure with special electrical, magnetic, electrochemical and mechanical properties, and has been widely used. For example, it is used as the core material of the control transformer, the material of the parts in the computer magnetic head and peripheral equipment, and the welding material. Rapid solidification is increasingly being valued by many parties.

3. Another development of composite material preparation and solidification technology is used in the preparation of composite materials. The so-called composite material is to introduce a reinforcing phase or special composition in a non-metal or metal matrix, and control the solidification to make the reinforcing phase in the desired way A distributed or arranged material with special properties. Because the matrix of the composite material has high fracture properties, coupled with the existence of the reinforcing phase, it can show different properties from ordinary single-phase structured materials, such as high strength, good high temperature performance and fatigue resistance, and many have been developed. Kinds of technological methods for preparing composite materials,Dongguan Precision CastingSuch as combining sequential solidification technology to prepare self-generating composite materials. The application prospects in this field will become wider and wider.