2results about How to "Reduce fluidity" patented technology

The utility model relates to a kind of gas meter air tightness detection device, comprising: water tank, translation mechanism, aeration mechanism, elastic support mechanism.The device water tank is divided into two water tanks by partition, translation mechanism and aeration mechanism are set in the lower of detection frame, gas meter is alternately placed in two water tanks to carry out air tightness detection, when left water tank gas meter air tightness detection is completed, re-place the gas meter to be detected, while translation mechanism will aeration mechanism be translated to the above right water tank, carry out air tightness detection to gas meter in right water tank, after detection, re-place the gas meter to be detected in right water tank, then translation mechanism will aeration mechanism be translated to the above left water tank, water flowability in left water tank is smaller at this time, water surface has tended to be stable, carry out air tightness detection to gas meter in left water tank at this time, and detection personnel is easier to observe the situation that bubble generates in water, so it improves the accuracy of gas meter air tightness detection.

The application relates to the technical field of ceramic preparation, and provides a preparation method of high-thermal-conductivity aluminum nitride ceramic, which solves the problems of relatively poor thermal conductive performance and bending strength of the aluminum nitride ceramic prepared by the prior art; the method comprises the following preparation steps: 1) raw material preparation; 2) ball milling mixing; 3) preheating reduction; and 4) hot-pressing sintering.