According to the different surface roughness HF before heat treatment temperature increase or decrease of the surface area of these can see from Fig. 3-10, 3-11 SEM photo possible.
Changes in these surface areas, Fig. 3-10, roughness of the surface by a heat treatment temperature before HF treatment can be seen from the SEM photograph of 3-11 is considered to be due to different.
The increase and decrease of the surface area of these Fig 3-10, as can be seen from the picture of SEM considered by heat treatment at different temperatures by the surface roughness of the HF before processing.