-
Anonymous users2024-01-24According to the Mohs scale, the hardness of glass is:
Let's first understand what hardness is!
Hardness indicates the ability of a material to resist a hard object pressing into its surface. It is one of the important performance indicators of metal materials. Generally, the higher the hardness, the better the wear resistance. Commonly used hardness indicators are Brinell, Rockwell and Vickers.
1.Brinell hardness (HB).
With a certain load (generally 3000kg) to a certain size (generally 10mm diameter) of hardened steel balls pressed into the surface of the material, keep for a period of time, after loading, the ratio of the load to its indentation area, that is, Brinell hardness value (HB), the unit is kilogram force mm2 (N mm2).
2.Rockwell hardness (HR).
When the HB>450 or the specimen is too small, the Brinell hardness test cannot be used instead of the Rockwell hardness measurement. It is to use a diamond cone with a top angle of 120° or a steel ball with a diameter to press into the surface of the measured material under a certain load, and the hardness of the material is calculated from the depth of the indentation. According to the hardness of the test material, it is expressed in three different scales:
??HRA: It is the hardness obtained by using a load of 60kg and a diamond cone presser, and is used for extremely hard materials (such as cemented carbide, etc.).
HRB: It is the hardness obtained by using 100kg load and diameter hardened steel balls, and is used for materials with low hardness (such as annealed steel, cast iron, etc.).
HRC: It is the hardness obtained by using a load of 150kg and a diamond cone presser, and is used for materials with high hardness (such as quenched steel, etc.).
3 Vickers hardness (HV).
The surface of the material is pressed into the surface of the material with a load of less than 120kg and a diamond square cone press with a top angle of 136°, and the surface area of the material indentation pit is divided by the load value, which is the Vickers hardness value (HV).
Judging from the above materials, the above hardness is for metals, can it be used for non-metals? If there is doubt, it should not be.
Mohs hardness is for a variety of different minerals.
The Austrian mineralogist Frederich Mohs created a hardness scale as a standard for judging the hardness of minerals. The softest is talc, the hardest is diamond, there are a total of ten minerals, set as ten grades, respectively:
Tempered glass is not easy to break, that is, it will not hurt people after being broken. However, there is a self-explosion situation in tempered glass, and the probability is about 1 in 1,000. >>>More
The domestic general steel wool ball raw material belongs to a kind of drawing wire, which was originally a steel bar, and this special steel bar has been dismantled for the first time after the virtual skin is pulled, and becomes a special raw material with a wire diameter like the thickness of a ballpoint pen lead, and this process is commonly known as large drawing. The 70 material is pulled again, and it becomes a special wire with a diameter like a hair, and the steel wool ball raw material is evenly wound on the spool, commonly known as 13 wires. >>>More
Generally, the windows should not be higher than the door.
It is highly recommended to use good quality.
Toughened glass. Because tempered glass is small particles when broken, and ordinary glass will have edges and corners when broken, compared with tempered glass, it is safe to personal safety even if it is broken. Secondly, tempered glass generally has a longer life than ordinary glass and is also durable, so tempered glass is still recommended. >>>More
Tempered glass is safer than ordinary glass, because when tempered glass is broken by the impact of strength, the fragments will break into countless uniform small particles and there is no sharp glass sharp corners of common glass, which is not easy to hurt people. >>>More