Effect of TiO2/Al2O3 film coated diamond abrasive particles by sol–gel technique

Evaluation of Coating Ability of TiO2 Nanoparticles onto Aluminum Alloy Sheet by Physicochemical Analysis

“…The appearance of overlap between the 400-660 cm -1 and 660-870 cm -1 bands corresponds to the Ti-O-Ti stretching vibration mode in crystalline TiO2 [34] and the Al-O stretching mode in crystalline Al2O3. This evidence indicates that it is possible that Al and Ti components were connected in the form of Al-O-Ti bond [35]. The presence of crystalline Al(OH)3 can be inferred from the presence of the broad absorption band in the range of 3700-3000 cm -1 with reference to −OH group stretching vibration at 1110 cm -1 [36] and at 660 cm -1 , consistent with the SEM-EDS results.…”

Preparation of SiO2-diamond composites by spark plasma sintering

“…The diameter of diamond ranged from 30 to 300 μm and the diamond content varied from 25 to 60 vol%. The coating on diamond particle by TiO 2 /Al 2 O 3 films prevented thermal oxidation of diamonds, thus improving the mechanical properties of glass-bonded diamonds [13]. However, the hardness of these glass-bonded diamonds were in the range of 1-9 GPa, which is comparable to that of borosilicate glass (5-8 GPa) [38].…”

“…The glass-and ceramic-diamond composites have higher refractoriness and endurance than resin-and metal-bonded diamond composites [9]. Glass-diamond composites using borosilicate glass by pressureless sintering [10][11][12][13] have widely been investigated, because of low sintering temperatures at 873 to 1073 K, and no phase transformation from diamond to graphite. However, the hardness of glass-diamond composites is low (1-9 GPa) due to the limited mechanical strength of glasses.…”

Improvement of thermal stability of diamond by adding Ti powder during sintering of diamond/borosilicate glass composites

“…[9][10][11] Vitrified diamond tools are often fabricated using cold pressing at the sintering temperature of 700-900 • C and the bending strength are usually tens of MPa. 5,[12][13][14] The highest strength reported is 37.1 MPa, which was the borosilicate glass composites with 90-106 m diamonds prepared at 780 • C. 14 One major issue is oxidation and graphitization for diamond grains. [14][15][16] This would degrade the diamond grains and produce numerous pores in the matrix which weaken the retaining force of the grits and the bending strength of the composites.…”