High temperature durable, oxidation resistant and lead nickel free conductor pulp and preparing method thereof

Abstract

The invention discloses high temperature-resisting antioxidative leadless nickel conductor slurry. The compositions in percentage by weight of the slurry are: 50 to 70 percent of nickel powder, 1 to 5 percent of antioxidative protective agent, 5 to 15 percent of inorganic agglomerant and 15 to 30 percent of organic carrier. The compositions are evenly mixed and ground to obtain leadless nickel conductor slurry product with granularity less than 15mu m and viscosity of between 65 and 75 Pa.s, wherein the nickel powder is selected from spherical nickel powder with the mean diameter of between 0.1 and 2.0 mu m; the antioxidative protective agent is selected from one sort or more than one sort of B, Cr and Y which are spherical micropowder with the mean diameter less than 1mu m; and the inorganic agglomerant is leadless glass powder. The slurry product has excellent high temperature-resisting antioxidative performance and is suitable for sintering under atmospheric condition with the antioxidative temperature adjusted between 800 and 900 DEG C. Moreover, the slurry has simple preparation process, low production cost and energy conservation and is propitious to environmental protection.

Description

technical field [0001] The invention belongs to the technical field of electronic components and materials, and in particular relates to a high-temperature and anti-oxidation lead-free nickel conductor slurry, which is suitable for use as an electrode material for electronic ceramic components. Background technique [0002] In recent years, the development of electronic equipment and surface assembly technology has been very rapid, and higher requirements have been put forward for electronic ceramic components in terms of miniaturization, high performance, low cost, and environmental protection. Electronic ceramic technology is moving toward multilayer, electrode Development in the direction of base metallization and lead-free. [0003] Conductive paste is widely used in the manufacture of electrodes for electronic ceramic components. It is generally composed of three parts: conductive phase, inorganic binder and organic carrier. Through the coordination and matching of the ...

AI Technical Summary

Problems solved by technology

[0006] In Japanese Patent 5-121204, in order to improve the heat resistance and oxidation resistance of the Ni electrode, 2-15% (atomic ratio) of Pt or Pd is introduced into the inner electrode slurry, resulting in an increase in product cost

Chinese patent document 02145520.1 (CN1188544C) discloses a production method of a high-temperature-resistant and anti-oxidation base silver-coated nickel powder composition, which uses a chemical method to make the surface of Ni fine powder directly be formed by the affinity of Ag molecules in the liquid to form a protective film, thereby Protect it from being oxidized at high temperature, the patent document does not involve the composition and preparation of conductive paste

However, due to the high toxicity of lead and its compounds, which cause great harm to the environment and human body, many countries in the world have successively issued many relevant laws and regulations to restrict and prohibit lead-containing products in recent years.

The use of lead-containing glass powder to make conductive paste can no longer meet people's requirements for environmental protection. It is necessary to realize the lead-free transformation of conductive paste and ensure its original functions under the premise of meeting ecological, environmental protection and green manufacturing. reproduction of

The current lead-free glass powder has a high softening temperature, which makes it difficult to meet the high reliability and stability requirements of conductive paste