BS ISO 20203:2005 pdf free.c- Calcined coke一Determination of crystallite size of cal lcined petrol leum coke by X-ray diffraction.
BS ISO 20203 6.2.1 Back-fill technique Put the window on a glass slide (Slide 1) and transfer sufficient quantities of sample into the window. Work the sample towards the corners of the holder using a glass slide or spatula. Press down using a flat glass slide and scrape off any excess material. Place a glass slide (Slide 2) on top of the sample and secure with tape. Remove Slide 1 to expose a flat, smooth surface before inserting into the diffractometer for analysis.6.2.2 Front-fill technique Place a confining ring over the round sample holder and fill the holder cavity and ring with sample. The ring will initially overfill the sample holder. Work the sample into the entire cavity and ring. Scrape the excess off with a glass plate or spatula. Press down using a flat glass slide. Remove any excess material on the front face of the holder. Repress the sample with the glass slide while turning clockwise and anticlockwise.Continue until the sample is level with the holder face. Place the sample in the diffractometer holder. 6.2.3 Side-loading technique Pack the sample. Clamp a glass slide over the top face to form a temporary cavity wall. With the holder in a vertical position, drift the powdered sample into the end opening. If necessary, use a cardboard pusher cut to fit the cavity, to lightly compress the sample so it will remain in the cavity. Return the holder to a horizontal position and carefully remove the glass slide. Place the sample in the diffractometer holder.6.2.4 Briquetting technique Weigh out 4,0g of the sample onto a watch glass and pipette exactly 3 ml of the binding agent onto the sample and mix thoroughly with a spatula. Place the sample under an infrared-heat lamp and allow the acetone to evaporate. T ypically, about 1 or 2 min will be required to eliminate the acetone odour from the sample. Break up the caked sample with a spatula and transfer to an aluminum cap whose diameter is compatible with the sample holder of the diffractometer. Place the cap in a briquetting press and press a 48 MPa. Transfer the pelletized sample to the sample holder and insert into the diffractometer for analysis.BS ISO 20203 pdf download.