In the cemetery, the tombstones that have been touched by countless pedestrians and rubbed by nature are still intact, and behind them lies the exquisite principle of wear-resistant materials. When the friction of wind blown gravel, the impact of impurities carried by rainwater, and even unintentional touches during daily rituals challenge the durability of tombstones, wear-resistant materials, with their unique structure and performance, safeguard the integrity and dignity of tombstones.
In addition to the hardness of the mineral itself, the microstructure of the tombstone material also affects its wear resistance. Observing stone with excellent wear resistance under a microscope, it can be seen that the mineral particles inside are tightly arranged, with almost no obvious pores or cracks. This dense structure greatly reduces the chance of external particles embedding into the surface of the stone, reducing the possibility of wear.
The formation process of granite determines its compact structure. In the high-temperature and high-pressure environment deep in the earth's crust, magma slowly cools and crystallizes, and mineral particles have sufficient time to arrange in an orderly manner, forming interlocking structures like tightly interlocked gears. However, some stones formed by rapid cooling have loose internal structures and numerous tiny holes, which not only reduce the strength of the stone but also become a "breakthrough point" for wear and tear, easily leading to surface peeling during friction.
