PCBs Can Be Used in High-Altitude Applications
A PCB, or printed circuit board, is an electronic assembly that houses a collection of components such as resistors, capacitors, transistors and diodes. These are connected by copper tracks which transmit energy between the components. This energy is regulated using circuits on the PCB, which in turn regulate the signals within the system. This allows for accurate control, ensuring that the board performs its intended function without overheating or generating too much electrical interference.
Aerospace applications demand a level of precision and reliability that is unprecedented. This is because the lives of passengers and crew, as well as the success of mission objectives, are dependent on the flawless operation of electronic systems onboard aircrafts, satellites, and space exploration vehicles. As such, aerospace pcb board must adhere to strict standards and specifications that dictate how the boards are designed and manufactured.
One of the most important considerations in designing a PCB is its material. Different materials offer varying degrees of performance, and each must be carefully weighed against the other in terms of cost, capability, and durability. For example, the standard substrate for a typical double-sided PCB is FR-4 glass epoxy, which offers excellent insulation properties and is highly durable. However, it is quite expensive and is not recommended for high-voltage applications.
An alternative to FR-4 is anodized aluminum, which can provide thermal conductivity up to five times greater than conventional materials while still remaining lightweight and minimizing the effects of heat-induced oxidation. It is also an ideal material for high-altitude applications, as it is resistant to corrosion and offers excellent vibration tolerance.
How PCBs Can Be Used in High-Altitude Applications
When selecting the material for a PCB, it is important to consider its ability to handle the extreme temperatures that are common in many aerospace environments. For instance, PCBs in satellites must be able to withstand freezing conditions in outer space, as well as the intense heat generated by onboard electronics.
In addition to temperature, other factors that must be taken into account are vibration and shock resistance. For example, aircrafts and satellites experience significant vibrations and shocks during take-offs, landings and manoeuvres. As a result, the components and connections on a PCB must be ruggedized to ensure they can withstand these mechanical stresses.
A final factor that must be considered is the possibility of corrosion. PCBs contain a large amount of metal, and if this metal is exposed to oxygen it may undergo a process known as oxidation. This can lead to the decomposition of the metal and the failure of the entire PCB.
In order to prevent this from happening, it is crucial that the copper layer on a PCB is insulated. The best way to do this is by using a solder mask. A solder mask is a thin layer of protective material that covers the copper surface on a PCB, keeping it from coming into contact with oxygen. Typically, a solder mask is white or yellow, but it can be any color. In addition to providing protection, a solder mask helps to maintain the integrity of the solder joints by keeping oxidation and flux residue from damaging the connections.
