Precision alloys for semiconductors (Tech Center of Shanghai HY Industry Co., Ltd)
Invention of silicon-based diodes in the late 1940s brought the world into the semiconductor era, and computing efficiency soared according to Moore’s Law. The faster operation also brings some problems. With the increase of the operating frequency, the magnetic inductance components that play the function of converting electric energy to magnetic energy to electric energy will generate a lot of energy loss, which will reduce the operation efficiency while increasing the power consumption.
Energy loss of magnetic inductance components mainly includes hysteresis loss and eddy current loss. The hysteresis loss is caused by the coercive force of the magnetic material, and reducing the coercive force of the magnetic material can effectively reduce the energy loss caused by the hysteresis loss. Therefore, soft magnetic alloy (Precision alloys) materials with low coercivity have become the darling of the semiconductor field.
Soft Magnetic Alloy (Precision alloys) Material Properties
Soft magnetic materials mainly include metal soft magnetic materials, ferrite soft magnetic materials and other soft magnetic materials. Soft magnetic alloy material is a magnetic material with low coercivity and high magnetic permeability, which is easy to magnetize and easy to demagnetize. Its main functions are magnetic conductivity, conversion and transmission of electromagnetic energy.
Application scenarios of soft magnetic alloy (Precision alloys) materials
There are many kinds of soft magnetic alloys, which can be divided into electromagnetic pure iron, iron-silicon alloy, iron-nickel alloy, iron-aluminum alloy, iron-silicon-aluminum alloy and iron-cobalt alloy according to the different elements of the alloy. Through proper process, the magnetic properties of soft magnetic alloys can be effectively controlled, such as initial permeability exceeding 105, maximum permeability exceeding 106, coercivity as low as 2‰ Oersted, close to 1 or close to 0 the rectangle coefficient. Soft magnetic alloys with face-centered cubic crystal structure have good plasticity and can be processed into ultra-thin strips of 1 μm and various application forms.
Soft magnetic alloy materials have developed rapidly in recent years, occupying certain advantages in high-end applications. Most of them are used in transformers, relays, inductor cores, semiconductor materials, magnetic shields, motor stator rotors and other electrical equipment and electronic equipment, and there is a large room for growth in product application demand.
Mainstream soft magnetic alloy (Precision alloys) performance introduction
Commonly used soft magnetic alloys are 1J27, 1J50, 1J79, 1J85 and so on.
1J27 soft magnetic alloy has good magnetic permeability and coercivity, and has three characteristics of high saturation magnetic induction intensity, high Curie temperature and high magnetostriction coefficient. Extremely high ductility and toughness also result in excellent machinability. Suitable for aviation and aerospace parts, motor rotors, electromagnet poles, relays, transducers, magnetic bearings, etc.
Saturation magnetic induction intensity of 1J50 soft magnetic alloy is slightly lower than that of silicon steel, but the magnetic permeability is dozens of times higher than that of silicon steel, and the iron loss is also 2~3 times lower than that of silicon steel. It is made into a higher frequency (400~8000Hz) transformer, and the no-load current is small. Suitable for making small and higher frequency transformers below 100W.
1J79 soft magnetic alloy has good comprehensive performance and is suitable for high frequency and low voltage transformers, leakage protection switch cores, common mode inductor cores and current transformer cores.
Initial permeability of 1J85 soft magnetic alloy can reach more than 100,000 105. It is suitable for low-frequency or high-frequency input and output transformers, common mode inductors and high-precision current transformers with weak signals.