A steady state economy is an economy with stable or mildly fluctuating size. The term typically refers to a national economy, but it can also be applied to a local, regional, or global economy. An economy can reach a steady state after a period of growth or after a period of downsizing or degrowth. To be sustainable, a steady state economy may not exceed ecological limits.
Noun. 1. nitride-a compound containing nitrogen and a more electropositive element (such as phosphorus or a metal). chemical compound, compound - (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight.
In gas nitriding the donor is a nitrogen rich gas, usually ammonia (NH3). It is sometimes known as ammonia nitriding. When ammonia comes into contact with the heated work piece it disassociates into nitrogen and hydrogen. The nitrogen then diffuses onto the surface of the steel creating a nitride layer.