Abrasivity Assessment of Granitic Building Stones in Relation to Diamond Tool Wear Rate Using Mineralogy-Based Rock Hardness Indexes

“…Figure 7 illustrates that the worn particles of the stylus material are deposited on the surfaces of feldspar and quartz at ambient temperature, whereas biotite is scratched off. According to the Mohs scale of hardness, the hardness of the stylus material is 5.5, which is smaller than those of feldspar (6) and quartz (7) but larger than that of biotite (3) [29]. The hardness of these minerals is temperature dependent and can increase dramatically at certain temperatures (e.g., 573°C for quartz) to promote drill bit wear [16].…”

Section: Discussionmentioning

confidence: 99%

“…The low degree of cementation between abrasive minerals reduces CAI [28]. The abrasivity of granite can be correlated with the Vickers and Rosiwal hardness indices based on mineral percentage [29]. This study aims to investigate the abrasivity characteristics of Bukit Timah granite after thermal treatment.…”

Section: Introductionmentioning

confidence: 99%

Temperature-dependent abrasivity of Bukit Timah granite and implications for drill bit wear in thermo-mechanical drilling

Wang

Zheng

et al. 2020

Acta Geotech.

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Thermo-mechanical drilling combines the advantages of flame thermal treatment and rotary head drilling to achieve a high penetration rate in granitic rocks and a low wear rate of drill bits. This drilling strategy has been recognized as a potential technique to develop deep geothermal energy, but further improvement is still needed to optimize the drilling efficiency, such as the reduction in drill bit wear in thermally treated rocks. We use the Cerchar abrasivity test to investigate the abrasivity characteristics of Bukit Timah granite after the thermal treatment at different high temperatures. The Cerchar abrasivity index (CAI) decreases from 3.5 at 25°C to 3.0 at 400°C, remains constant between 400 and 600°C and subsequently increases to 4.1 at 800°C. Based on the meso-scale and micro-scale observations using polarizing microscope, 3D scanner and scanning electron microscope, the reduction in CAI value at lower temperatures is due to the abrasive wear of stylus tip, while the mechanical interaction between the stylus cone and abrasive minerals causes the increase in CAI value at higher temperatures. The Cerchar abrasivity test results indicate that overheating rocks may result in the exposure of drill bits to more abrasive minerals and enhance drill bit wear.

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“…The results of the study demonstrated that the up-cutting mode was more efficient than the down-cutting mode. Yılmaz [27] determined a good correlation among the SWR, mineral content and hardness (Vickers and Rosiwal). Yılmaz et al [28] determined the relationships between the mineralogical properties of granites and SWR.…”

Section: Introductionmentioning

confidence: 99%

Determination of the wear performance of diamond saw blades using inductively coupled plasma

2019

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Saw blades are one of the most used cutting tools. They compose the expensive parts of a cutting machine. Therefore, saw-blade wear is an important parameter governing the economy of the cutting process. Significant savings could be made when it is controlled effectively. In this study, a new methodology is employed for the determination of the saw-blade wear in the cutting of two types of marble. Wear of segments is determined by high-precision inductively coupled plasma method. Two types of marbles were used to investigate the wear performance of diamond-impregnated segments of circular saw-blade matrix. Taguchi mixed design L16 (4 3 2 1) is used as an experimental design and the results are evaluated statistically with Minitab. The results reveal that the specific wear rate (SWR) of Beige marble increases with the increase of the peripheral speed, traverse speed, depth of cut and down-cut mode operation. Additionally, it is demonstrated that the traverse speed and peripheral speed are the dominant cutting parameters affecting the SWR. It is also seen that similar trends are observed for Onyx marble (excluding peripheral speed). Finally, it is concluded that the proposed models can be effectively used for the estimation of the SWR.

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Abrasivity Assessment of Granitic Building Stones in Relation to Diamond Tool Wear Rate Using Mineralogy-Based Rock Hardness Indexes

Cited by 34 publications

References 22 publications

Effects of intra-crystalline microcracks on the mechanical behavior of a marble under indentation

Effects of intra-crystalline microcracks on the mechanical behavior of a marble under indentation

Temperature-dependent abrasivity of Bukit Timah granite and implications for drill bit wear in thermo-mechanical drilling

Determination of the wear performance of diamond saw blades using inductively coupled plasma

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