2results about How to "Change crystal structure" patented technology

The utility model relates to the technical field of oil exploitation, in particular to a tubular anti-scale and anti-wax oil well pump which comprises a pump cylinder coupling, a pump cylinder, an anti-scale and anti-wax alloy plunger assembly, an anti-scale and anti-wax alloy standing valve assembly, an oil pipe coupling and an anti-scale and anti-wax alloy device. The pump cylinder coupling is in threaded connection with the upper end of the pump cylinder; an anti-scale and anti-wax alloy plunger assembly is arranged in the pump cylinder; the anti-scale and anti-wax alloy standing valve assembly is mounted at the lower end of the pump cylinder; and the tubing coupling is respectively connected with the lower end of the anti-scale and anti-wax alloy standing valve assembly and the anti-scale and anti-wax alloy device. Due to the design of the anti-scale and anti-wax alloy assembly, the contact area between the anti-scale and anti-wax alloy and oil liquid is increased, the oil liquid and the anti-scale and anti-wax alloy can make more sufficient contact and catalysis, formation of new scales can be prevented, and dissolution of old scales is promoted. The wax crystal form is changed by utilizing the conductivity and the surface catalytic characteristic of the anti-scale and anti-wax alloy, so that the freezing point is greatly reduced, and the anti-wax effect in the lifting process is achieved.

This invention provides a rare-earth-doped potassium sodium niobate transparent ceramic, its preparation method, and its application. Its chemical composition is: (K 0.5 Na 0.5 ) （1‑x‑y） Eu x Y y Nb （1‑z） Ta z O3, where 0 < x < 0.1, 0 < y < 0.01, 0 < z < 0.02. The rare-earth-doped potassium sodium niobate transparent ceramic of the present invention exhibits high light transmittance and light-changing properties; with the introduction of Y and Ta, the crystal structure and microstructure of the material are changed, increasing the vacancy-related defects of the material, while inhibiting the grain growth of the material, thereby simultaneously improving the light transmittance and light-changing rate of the ceramic. Its light transmittance can reach more than 70%, and the light-changing rate can reach up to 37.58%.