Thick Film Circuit Boards

A thick film circuit board comprises at least parts of sic substrate at which a thick film resistor is provided being coated with a glass layer having a good adhesion to the sic substrate and the same or similar coefficient of thermal expansion as or to that of the sic substrate and no swelling cracking and peeling appear on the thick film resistor and no electroconductive component is.

Thick film circuit boards.

What are thick film circuit boards. Thick film circuit substrates are al 2 o 3 alumina beryllium oxide beo aluminum nitride aln and sometimes even silicon si coated with silicon dioxide sio 2 most used substrates for a thick film process are either 94 or 96 alumina. Thick film substrates are electronic circuit boards generally made from ceramics. Mpt is a one stop shop for your thick film substrate needs.

The metal deposition methods used in vacuum processes and the flexibility that can be achieved in terms of thickness and type of metallization in particular really set thin film technology apart from printed circuit board technology. In many cases a thick film hybrid can replace the pcb to function in environmentally adverse conditions. Thick film hybrids are a more robust alternative to printed circuit boards pcb. The thick film refers to the thickness of conductor layer on ceramic pcb.

Normally the thickness will be at least exceeds 10 miron um around 10 13um more thick than spurting technology in thin film ceramic pcb. Alumina is very hard and not very machinable therefore lasering of the material is the most efficient way to machine it. Thicker thickness such as 1 6mm or 2 0mm can be customized too. A thin film circuit board as recited in claim 9 wherein the barrier layer comprises sio 2.

Thick film hybrid circuits are made using a print fire p f technique. A barrier layer formed on the upper surface of the lower layer portion and defining the interface with the lower surface of the upper layer portion. The ceramic is screened with conductor insulator and resistor material to form the circuitry. Basic parameter of thick film ceramic board.

This involves a combination of multi layer screen printing of precious and semi precious metals au ag pd as well as the firing of tracks and precision resistors onto a range of ceramic and metal substrates. Thin film technology uses semiconductor and microsystem technology processes to produce circuit boards on ceramic or organic materials. Ics produced by thin or thick film techniques have the advantages of forming passive components with wider range and better tolerances better isolation between their components greater flexibility in circuit design and of providing better high frequency performance than monolithic ics. A portion of thick film circuit is given in fig 1.

A thin film circuit board as recited claim 7 further comprising. 0 25 0 38 0 50mm 0 635mm default thickness 0 76mm 1 0mm. Thick film hybrids can operate in extreme heat underwater and in many other conditions in which a pcb cannot function. Steps lasering of substrates.