48results about How to "Adjust the coefficient of thermal expansion" patented technology

The invention discloses a complete set of a titanium ceramic powder for a dental department and a preparation method thereof. The titanium ceramic powder comprises bonded ceramic powder, color-masking ceramic powder and body ceramic powder. The bonded ceramic powder comprises the following components in percentage by weight: 50-55 percent of SiO2, 5-10 percent of Al2O3, 8-15 percent of B2O3, 10-15 percent of SnO2, 0-1 percent of CaO, 1-3 percent of ZrO2, 4-10 percent of Na2O, 5-8 percent of K2O, 0-1 percent of Li2O, 1-4 percent of BaO and 0-1 percent of F; the color-masking ceramic powder comprises 50-60 percent of SiO2, 3-10 percent of Al2O3, 0.5-1 percent of CaO, 20-30 percent of SnO2, 0-1 percent of TiO2, 0.5-1 percent of ZrO2, 7-10 percent of Na2O, 5-8 percent of K2O and 0.5-4 percentof BaO; and the body ceramic powder comprises 60-70 percent of SiO2, 4-10 percent of Al2O3, 0.5-1 percent of CaO, 1-5 percent of B2O3, 5-10 percent of Na2O, 5-10 percent of K2O, 0.5-1 percent of Li2Oand 5-8 percent of BaO. In the titanium ceramic powder, besides the body ceramic powder, a crystal phase is added in the bonded ceramic powder and the color-masking ceramic powder by an intermediate material technology for secondary synthesis process, thereby not only regulating the thermal expansion coefficient of ceramic materials, but also being beneficial to reducing the ceramic temperature and being simultaneously beneficial to improving the bonding strength of titanium and ceramic.

Disclosed are praseodymium-doped borophosphate base near-infrared ultra wide band luminescent glass and a preparation method thereof. The glass comprises 45-83 mol% of P2O5, 5-35 mol% of B2O3, 4-23 mol% of Al2O3, 6-22 mol% of Y2O3 and 0.1-3 mol% of Pr2O3. The preparation method of the glass includes the steps of raw material weighing, presintering, founding, pouring, annealing and the like. The preparation method is simple in process, high in ultra wide band near-infrared fluorescence-emission characteristic with emission wavelength of 830-1700nm and capable of improving the stability of the glass, reinforcing the luminous intensity of praseodymium ions, and satisfying the requirement of optical fiber wiredrawing.

The invention discloses a lead-free low melting point glass and a method for producing the same. The melting temperature of the glass is between 400 and 680 DEG C and the thermal expansion coefficient thereof is between 75 and 130*10<-7> per degree centigrade. The method comprises the following steps: adopting a material with certain chemical activity to prepare a phosphate system powder material with a wide process range and strong adaptability; dissolving the phosphate system powder material in a hydrochloric acid environment so as to synthesize chloride containing Sn4P2O7, Ba<2+>, Al<3+>, Zn<2+>, Sr<2+>, Cu<+> and Ca<2+> so as to form a glass pre-matrix; and melting the glass pre-matrix and then compounding the glass pre-matrix with low expansion stuffing so as to generate a lead-free inorganic sealing material. The lead-free low melting point glass is suitable to adjust the thermal expansion coefficient and has lower softening temperature and good chemical stability.

The invention relates to the technical field of vacuum glass manufacturing, in particular to a vacuum glass sealing material and an anodic bonding enhanced sealing method thereof. An adopted edge sealing material is lead-free low-melting-point glass powder, and the glass powder is characterized by being low in sealing temperature and adjustable in thermal expansion coefficient, the requirements for low temperature sealing can be met, and the anodic bonding is used to enhance the vacuum glass sealing to achieve a low temperature sealing process. The lead-free low-melting-point glass powder is fully melted and does not crack during the sintering process at 300-450 DEG C, and forms a good infiltration with substrate; and at the same time, an anodic bonding sealing technology is used to further lower the sealing temperature and improve the sealing strength and quality. A new technical scheme is provided for vacuum glass edge sealing, a vacuum glass sealing process is improved, and a new solution is provided for preparing the vacuum glass excellent in performance.