Experiments at Mo S&T had shown that adding a thin vapor deposited diamond layeronto the throat section of an abrasive waterjet focusing tube would provide someperformance enhancement during its lifetime. Initial testing did not, however, increasethat lifetime. Tests using diamond coating on softer carbide substrates were notsuccessful where the abrasive used was a garnet, but when steel grit was used as theabrasive a significant increase in operational life of the nozzles was achieved. Whilethese tests did not extend into using harder carbide substrates, or graded carbide:diamondlayers in the coating, it has been shown that applying diamond coating to two half-nozzlesections before recombining them did allow total diamond coating down the cylindricalpart of the focusing tube was successful. The recombined nozzle functioned well withoutany evident negative results from the sectioning process.
展开▼
