After each lixamento the surface must be carefully clean. The second stage is in the Politriz sander with sandpaper 260. It is placed part in the record revolving and it continues the process, then after one changes for Politriz with sandpaper 360, all the lixamento process was carried through with water lubrication, always keeping the effort in the center of the sample not to create plans. 4 Passo – Burnishing As in the lixamento, burnishing must remove the damages introduced for the previous stages. That is gotten through successive stages of finer abrasive particle application.
The diamond is used as an abrasive, and obtains the fastest removal of material and the best possible planicidade. It does not have another abrasive capable to produce resulted similar. Had its hardness, the diamond can extremely cut well to all the materials and phases. Certain materials, especially those that are soft and dcteis, require final burnishing of excellent quality. In this in case that, burnishing is used the oxide base. The colloidal silica, of size of approach grain of 0,04 mm and pH of 9,8, has demonstrated great resulted. The combination of chemical activity and fine abrasion soft absolutely produces samples without risks and deformations. The OP-U is a suspension for general burnishing, that supplies to perfect results in all the types of materials.
The OP-S can be used with reagents that increase the chemical reaction, that becomes the OP-S an excellent option for very dcteis materials. A suspension of alumina, acid, OP It, is used for final burnishing of steel of low and high league, nickel alloys base and ceramic. Description of the assay: After the lixamento, places it part in the Politriz with felt of thickness 3 m, water for the lubrication and adiamantada folder to assist in burnishing. After that, it is placed part in the Politriz with felt of 2 m and folder adiamantada with finer granulation to have better finishing, until the surface of the sample to be espelhada and without no arranhado.