3 results about "Lanthanum titanate" patented technology

The present application relates to a kind of low dielectric loss and low temperature coefficient microwave dielectric ceramic and its preparation method, the preparation method includes the following steps: after mixing zinc lanthanum titanate, strontium source and auxiliary raw material, sequentially forming and sintering, the low dielectric loss and low temperature coefficient microwave dielectric ceramic is prepared;The auxiliary raw material includes any one or combination of at least two of calcium carbonate, manganese dioxide or barium carbonate.The present application selects zinc lanthanum titanate and strontium titanate with good microwave dielectric properties as basic raw material to ensure the basic performance of ceramic;Introduce appropriate amount of calcium carbonate, manganese dioxide and barium carbonate, effectively reduce the dielectric loss of ceramic, and improve its temperature characteristics;The present application reduces production cost and technical difficulty by solid phase reaction method, while ensuring the uniformity and stability of ceramic, effectively reduces the dielectric loss of microwave dielectric ceramic, and improves its temperature characteristics, further improves the performance of ceramic.

The present application relates to the technical field of capacitor manufacturing, and discloses a kind of MLCC electrode nickel paste sintering shrinkage and BaTiO3 ceramic medium matching regulation and control method, comprising the following steps: S1: the conductive ceramic shrinkage inhibitor powder, dispersing agent and organic carrier are ball milled to obtain pre-dispersion, the conductive ceramic is selected from at least one of titanium nitride, titanium carbide, calcium copper titanate, lanthanum titanate or lanthanum strontium manganese oxide;S2: nickel powder is heat treated in H2 / N2 mixed atmosphere to obtain surface-activated nickel powder;S3: pre-dispersion, surface-activated nickel powder, dispersing agent, organic carrier and additives are mixed to form paste;S4: grinding dispersion to fineness≤5 μm.The present application replaces insulating oxide with conductive ceramic, combines nickel powder activation and contains heat preservation platform's step temperature rise, constructs conductive rigid skeleton, realizes shrinkage matching, gives consideration to electrode conductivity and interface bonding force, solves the problem that shrinkage matching and conductive performance are difficult to give consideration to.

This invention discloses a homogeneous corundum mullite brick and its preparation process, belonging to the field of refractory materials technology. The process employs a sol-gel assisted microscopic in-situ homogenization method: a precursor sol film is formed on the submicron-level bauxite surface by constructing a homogeneous lanthanum ion solution and performing colloidal-level contact grinding; a salt bridge network is formed by spray drying and granulation; finally, sintering is carried out under an oxidizing atmosphere, inducing lanthanum ions to preferentially react with impurities to generate high-melting-point lanthanum ferrite or lanthanum titanate-like crystalline phases. This process blocks impurities from participating in the formation of low-melting-point glass phases at the microscopic scale, resulting in clean grain boundaries within the brick and the absence of continuous glass phases. The obtained product exhibits a high-temperature creep rate of less than [value missing] and a load softening temperature of [value missing], achieving a breakthrough in the preparation of high-end refractory materials using low-grade raw materials.