Table 2 Compressive strength values (MPa), thermal conductivity, thermal expansion coefficient, and melting and vaporization point for some common types of rock [59, 62,63,64,65] (www.geology.com, www.AZoM.com)
From: Laser drilling: reviewing the effect of purging system and formation parameters
Rock type | Granite | Basalt | Lime stone | Sand stone | Shale | Quartzite |
|---|---|---|---|---|---|---|
Compressive strength range (MPa) | 130–300 [62] | 100–300 [62] | 30–250 [63] | 15–120 [62] | 5–50 [64] | 120–300 [65] |
Average compressive strength (MPa) [59] | 181.7 | 214.1 | 120.9 | 90.1 | 103 | 288.8 |
Thermal expansion coefficient range (10−6/°C) | 7–10 [62] | 7–10 [62] | 8.4–11.2 [63] | 8.2–13.9 [62] | 7–12 [64] | 12–14 [65] |
Thermal conductivity range (W/mK) | 2.6–3.0 [62] | 2.7–3.3 [62] | 1.33–2.87 [63] | 1.31–2.13 [62] | 1.1–2 [64] | 5–7 (www.geology.com) |
Melting point (or range) °C | Depends on composition (1200–1710) | 1100–1200 [65] | Decompose @ 825 °C before reaching the melting point [682] | 1,710 (www.geology.com) | 1000–1300 [65] | 1650 (www.AZoM.com) |
Vaporization point (or range) °C | - | 2800 [65] | - | - | 2800 (www.AZoM.com) |