This is a comparison between the stainless and marble on the basis of aluminaJTcA-479 standard
The main indexes, such as coefficient of thermal expansion, specific gravity, secular variation , you modulus , hardness, instinctive vibration frequency are all shown in relation to the alumina value of 1.We have got the following results:
It is, in the thermal expansion coefficient, about 1/2 of the stainless steel, and stable in any temperature changes.
It is almost same as marble in specific gravity, but it would be hollow . Owing to the hollow, the gravity of unit volume of the marble is lighter than volume granite. So it is easier to start and stop for using gas the machinery component.
It can be said very stable in secular variation by our company after a 5-year inspection and examination.
Because it's extension modulus is 1/2of the stainless steel , it is better to be critically processed. In addition ,the whole precision will not be destroyed with the pressing -mark .
It is considered as the best material because of its hardness and wearable capacity (5 times higher than granite's)
The instinctive vibration frequency has the close relation with the extension modulus and specific gravity of the materials. it is high in the vibration frequency, extensive in used -eddy range and betters in shockproof. All those can satisfy with the following requirements seen from the function:
It is most important for a measuring tool go get a higher precision standard. And now, much more attention is being focused to the new material-ceramic, and it can be seen as the modern material because of its advanced performance, such as thermal expansion, secular variation, hardness rigidity, wearable capability, etc.
It will guarantee a fast measuring speed and a high -efficiency, depending on its own rigidity and specific gravity.
Considered its rationality and stability, it need not the special maintenance. It is anti-rust, corrosion resistance and wearable resistance so it is believed as an ideal material for the high precision measuring tool and machinery component.
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