Single chamber high pressure gas quenching vacuum furnace,double chamber and multichamber vacuum furnaces implementing the acetylene low pressure carburizing were briefly introduced.
Both numerical prediction and experiments signified that the new type flameholder has a bright prospect as a kind of high combustion efficiency and low pressure loss flameholder.
This rock contained chalcedonic cement before it underwent diagenesis, a process where low temperatures and low pressures alter the content of sediments before they finally lithify, or turn into rock.