The basic cindition about the bearing capacity test of rubble - mound bedding on hard foundation is introduced in the paper and the test result is analized in detail and the recommended value of allowable bearing capaing of rubble -mound bedding on hard foundation is proposed.

MgO-Al2O3-SiO2 glass ceramic is an excellent potential material for hard disk substrates with good mechanical properties,and it can essentially meet the requirements of hard disks with higher storage capacity and higher rotation speed.

Then its CMP properties on hard disk substrate with nickel-phosphorous plated was studied.

Chemical-mechanical polishing of hard disk substrate with nickel-phosphorous plated in the prepared nanometer SiO 2 slurry was studied.

Chemical mechanical polishing(CMP)is widely used to obtain the atom-scale planarization surface in the manufacturing of computer hard disk substrate.

The tribological properties and mechanisms of sulfide layer were investigated on different steel,which possess different substrate hardness.

The critical load L c of TiN coating increases with the increasing of substrate hardness and coating thickness,but decreases with the increasing of surface roughness.

Basing on the similarity of both two stress strain curves on hardening stage, we proposed that the curves were composed of matrix hardening, behavior softening and structure hardening From that we explained the partial stress strain curve of upward curvature was resuled from the interaction of dominant softening and hardening The similarity and difference in defomation .