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Method for preparing conductive titanate powder by rare earth gas-phase diffusive permeation

A technology of conductive powder and titanate, which is applied in the field of preparation of rare earth titanate conductive powder, which can solve the problems of high cost, easy fusing, and arc generation

Inactive Publication Date: 2005-02-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Current transformers and motors all use metal coils. Since the conductivity of metals drops sharply with the increase of temperature, in order to reduce the self-loss of electrical equipment, cooling measures such as exhaust fans, transformer oil, and oil pumps must be used. These cooling facilities It can often account for 50% of the equipment manufacturing cost; however, the current contacts of relays and circuit breakers are made of precious metals, such as Pt, etc., the biggest problem is: not only the cost is high, but also an arc will be generated at the moment of breaking , prone to fusing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0004] Specific Embodiment 1: This embodiment is carried out according to the following steps: a, preheat the carburizing furnace, and drop an amide reagent into the furnace to remove the air in the furnace; b, dissolve the rare earth oxide in concentrated nitric acid , heat until the oxide is completely dissolved, adjust the concentration with an amide reagent after cooling, and prepare an infiltrating agent with a molar concentration of rare earth ions of 0.01 to 0.04; c, put titanate nanopowder (30 to 40 nm) quickly Put it into a carburizing furnace, drop the prepared rare earth-containing infiltrating agent into the furnace, and infiltrate at a temperature of 860-950°C for 3-6 hours to obtain titanate-based conductive powder. The amide reagent is formamide or acetamide.

specific Embodiment approach 2

[0005] Specific embodiment two: this embodiment is carried out according to the following steps: a, preheating the carburizing furnace, and dripping formamide reagent in the furnace; b, dissolving lanthanum oxide in concentrated nitric acid, heating until completely dissolved, cooling After adjusting the concentration with formamide, it was prepared as La 3+ The mass molar concentration is the osmosis agent of 0.02; c, the PbTiO 3 The powder is quickly put into the carburizing furnace, and the La 3+ Infiltration agent, infiltrated at a temperature of 950 ° C for 4 hours, to obtain PbTiO 3 Department of conductive powder. The resulting powder was subjected to XRD analysis, the results showed that: infiltration of PbTiO 3 The La element in the powder reacted complexly with the ceramic components to form LaTiO 3 and LaTi 3 o 49 and other new compounds, which lead to a significant change in conductivity, resulting in PbTiO 3 It is a conductive powder, and its room temperatu...

specific Embodiment approach 3

[0006] Specific embodiment three: this embodiment is carried out according to the following steps: a, preheating the carburizing furnace, and dripping formamide into the furnace; b, dissolving praseodymium oxide in concentrated nitric acid, heating until completely dissolved, and cooling The concentration was adjusted with formamide to prepare Pr 3+ The mass molar concentration is the osmotic agent of 0.02; c, the BaTiO 3 The powder is quickly put into the carburizing furnace, and the Pr-containing 3+ Infiltration agent, infiltration at 920°C for 4 hours, to obtain BaTiO 3 It is a conductive powder with a room temperature resistivity of 3.5×10 -4 Ω·m.

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Abstract

A process for preparing the electrically conductive titanate powder by gas-phase RE diffusion method includes such steps as thermally dissolving RE oxide in concentrated nitric acid, cooling using amide reagent to regulate its concentration to obtain RE contained panetrant, preheating carburizing furnace, dropping amide reagent into it, quickly loading titanate powder in the furnace dripping said penetrant in the furnace, and diffusing at 860-950deg.C for 3-6 hr.

Description

Technical field: [0001] The invention relates to a process for preparing rare earth titanate conductive powder. Background technique: [0002] Currently commonly used conductive powders include metal powder, carbon black, graphite, carbon fiber, metal flakes or fibers, metal oxides, etc. Among them, the price of metal powder is more expensive, it is easy to oxidize and reduce the conductivity, the metal fiber is mixed and dispersed unevenly, and it is easy to break and orientation during processing, so it is only used in occasions such as electromagnetic wave shielding with particularly good conductivity requirements; the addition of graphite The amount is relatively large (30-60%), which makes the performance of the product brittle; the carbon fiber is expensive; the conductivity of the metal oxide powder is poor. Therefore, it is an urgent need to study new conductive ceramic powders with good conductivity, low price, light color and stable performance. Current transform...

Claims

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Application Information

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IPC IPC(8): C04B35/462C04B35/622
Inventor 韦永德郝素娥
Owner HARBIN INST OF TECH
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