In no? Check the coffee table

The self-explosion of tempered glass is not due to external reasons, but due to its own quality, caused by the expansion of nickel sulfide (Nis) impurities in the glass.

Nickel is brought in by quartz sand or sandstone, the main material of glass, and sulfur is brought in by fuel and auxiliary materials, which is burned and melted in 1400 1500 high-temperature furnaces to form nickel sulfide. When the temperature exceeds 1000 °C, nickel sulfide is randomly distributed in the molten glass in droplets. When the temperature drops to 797, these droplets crystallize and solidify, and the nickel sulfide is in the -Nis crystal phase (hexagonal crystal) at high temperatures.

As the temperature continues to drop to 379, the crystalline phase transitions to a low-temperature -nis (trigonal crystal system) with accompanying volume expansion. The speed of this transition depends on the percentage content of different constituents (including Ni7S6, Nis, etc.) in the nickel sulfide particles, as well as the temperature around them. If the nickel sulphide phase change is not completely converted, the process continues even at natural storage and normal use temperatures, albeit at a very low rate.

When the glass is tempered and heated, the core temperature of the glass is about 620, and all the nickel sulfide is in the -nis phase at high temperature. Subsequently, the glass enters the wind grating and the nickel sulfide in the glass undergoes a phase change at 379. Unlike float annealing kilns, the tempering quenching time is very short, and it is not too late to convert to the low-temperature -NIS state, and the nickel sulfide phase is "frozen" in the glass in the high-temperature state.

Rapid quenching tempers the glass to form a stress-uniform balance body with external pressure and internal tension. In the tempered glass, the nickel sulfide phase transformation continues at a low speed, and the volume continues to expand and expand, and the force on the surrounding glass increases. The core of the tempered glass plate itself is a tensile stress layer, and the volume expansion of nickel sulfide in the tensile stress layer also forms tensile stress when the phase transformation occurs, and these two tensile stresses are superimposed together, which is enough to cause the fracture of the tempered glass to explode.

Coffee tables are generally divided into square and rectangular shapes, and the height is equivalent to the armrests of armchairs. Usually, there is a coffee table sandwiched between two chairs, which is used to put cups and plates and tea sets, hence the name coffee table. In Internet terms, tragedy is the same as "cup", and tragedy is homophonic with "tableware", which leads to the "environment that carries tragedy (cup) and tragedy (tableware)" as a coffee table.

The coffee table was a piece of furniture that became popular in China after the Qing Dynasty. As seen from the paintings of the Ming Dynasty, the incense table had the function of a coffee table at that time, and it was only in the Qing Dynasty that the tea table was separated from the incense table and evolved into an independent new variety. Generally speaking, the coffee table is shorter, and some are made into two layers, which is easier to distinguish from the incense table.