摘要:
A process and etchant solution for chemical wet etching of thin film metals in the presence of a protected metal. The etching solution has a pH range of about 2.7 to 4.0. The etching solution may include hydrogen peroxide, potassium sulfate, and potassium EDTA, and it reduces or eliminates the incidence of etch-resistant metal without damaging the protected metal.
摘要:
A process and etchant solution for chemical wet etching of thin film metals in the presence of a protected metal. The etching solution has a pH range of about 2.7 to 4.0. The etching solution may include hydrogen peroxide, potassium sulfate, and potassium EDTA, and it reduces or eliminates the incidence of etch-resistant metal without damaging the protected metal.
摘要:
A copper-based paste for multilayer ceramic substrate vias and lines including copper particles as the majority constituent of the paste, a refractory metal additive selected from the group consisting of chromium, tantalum, and tungsten, and organic materials.This copper-based paste has particular applicability to the formation of vias and lines in ceramic packages wherein the vias and lines would have a composition principally of copper with additions of the refractory metal.
摘要:
A molybdenum etching process which reduces hazardous treatment waste is disclosed. Etchants which can be used are ferric sulfate and ferric ammonium sulfate. Waste products resulting from this etch are Fe(OH).sub.3 and CaSO.sub.4.
摘要:
The cracking experienced during thermal cycling of metal:dielectric semiconductor packages results from a mismatch in thermal co-efficients of expansion. The non-hermeticity associated with such cracking can be addressed by backfilling the permeable cracks with a flexible material. Uniform gaps between the metal and dielectric materials can similarly be filled with flexible materials to provide stress relief, bulk compressibility and strength to the package. Furthermore, a permeable, skeletal dielectric can be fabricated as a fired, multilayer structure having sintered metallurgy and subsequently infused with a flexible, temperature-stable material to provide hermeticity and strength.
摘要:
This invention provides a process for producing a fine grain metastable tetragonal zirconia which has an average particle size less than about 1000 angstroms in diameter.The process involves multistage thermolysis of precursor solids comprising a homogeneous mixture of .beta.-ketonate compounds of zirconium and a stabilizer metal such as yttrium.
摘要:
A method is provided for etching and removing extraneous molybdenum or debris on ceramic substrates such as semiconductor devices and also for molybdenum etching in the fabrication of molybdenum photomasks. The method employs a multi-step process using an acidic aqueous solution of a ferric salt to remove (etch) the molybdenum debris followed by contacting the treated substrate with an organic quaternary ammonium hydroxide to remove any molybdenum black oxides which may have formed on the exposed surface of treated molybdenum features in ceramic substrates. The method is environmentally safe and the waste solutions may be easily waste treated for example by precipitating the ferric salts as ferric hydroxide and removing anions such as sulfate by precipitation with lime. The method replaces the currently used method of employing ferricyanide salts which create serious hazardous waste disposal and environmental problems.
摘要:
This invention provides a process for production of a microcrystalline metal oxide having an average particle size less than about 1000 angstroms.An important feature of the invention process involves the application of ultrasonic wave energy during the stage that a solution of metal organic compounds is being treated to form a gelled solution. The ultrasonic energy input during the gelling stage enhances the production of a high purity metal oxide powder having fine grain particles of uniform microspheric dimensions.
摘要:
The present invention provides an improved gel precipitation method for producing a Ni.sub.0.7 Zn.sub.0.3 Fe.sub.2 O.sub.4 type of ferrimagnetic spinel powder which has an average particle size of less than about 1000 angstroms.
摘要:
A process for imaging a lithographic printing plate having a presensitizing coating. An ink jet printer is used to apply imagewise micro drops of an insolubilizing solution that insolubilizes exposed areas of the coating. The latent image is then developed. The process works with conventional, commercially available developing processors.