 |
 36pc Big 3 8 LETTER NUMBER STAMP SET New stamper punch $29.99 |
 5 32 Number Letter Stamp Punch Set $10.25 |
 1 8 Steel Metal Letter Alphabet Number Stamping Stamp Punch Set Plastic Case $14.99 |
 7x7mm Straight Shank Steel Number Punch Stamps Set 5mm $10.37 |
 36 PCNUMBER AND LETTER STAMP PUNCH SET 5 32 WARRANTY $19.99 |
 38pc AUTOMATIC LETTER NUMBER STAMPER PUNCH SET stamp $19.99 |
 1 8 Steel Stamp Stamping Number Letter Alphabet Alpha Numeric Punch Marking Set $24.95 |
 36 PC Number Letter Punch 3MM Set Stamp Metal Steel New $28.99 |
 NUMBER STAMP PUNCH SET $5.00 |
 5 32 4MM Letter Punch Stamp Set 0 9 9pcs Part Codes $9.99 |
 1set Jewelry Metal Steel Hand Stamp Punches 925 14K 18K $23.99 |
 38 PC NEW STEEL LETTER NUMBER STAMPING SET STAMP ID $14.77 |
Stamp Punch Set
How to Use Alphabet Punch Sets for Stamping
Find out more about Stamp Punch Set below
Ltcc Applied To Study The Possibility Of High by hi joiney
Technical process and the advantages of its microelectronics industry, particularly the high-power RF circuit applications is feasible.
1 Introduction The world's electronic products have entered a faster, higher density, volume of thinner, lower cost and require more efficient cooling package of the times. With radio communications (such as mobile phones) the rapid commercialization of cost reduction, improved performance has a lot of pressure. LTCC (Low Temperature Co-fired Ceramic) technology is a low-cost packaging solutions, has developed the characteristics of short cycle. This article reviews the use of LTCC in microelectronics industrial development to meet the particular requirements on the application of high-power RF circuit feasibility.
2 LTCC Technology Overview LTCC is an extension will not stream sintered ceramic material made of multi-layer laminated with the circuit, which has printed interconnection conductors, components and circuits, and the structure of an integrated ceramic firing more floor material. LTCC thick film dielectric material using conventional tape, rather than the screen printed medium slurry. Health porcelain with a cut size of the appropriate size, shot hole and cavity aligned, interconnect via drilling by laser drilling or mechanical form. The conductor, together with the required resistors, capacitors and inductor to the screen printing or lithography on ceramic floors. Layers of tiles and then aligned, laminated and co-fired at 850. Use of the existing substrate and thick film circuit production technology for surface mount assembly.
3 LTCC Process Overview LTCC materials from the mixture of organic and inorganic elements composition. Organic component is dissolved polymer binders and plasticizers in the composition of the solution. Such as polyvinyl butyral, polyethylene plastic and low-level formaldehyde acetone alkyl (hydrocarbon) based acrylate copolymer. Acrylic is also used because they can be clean latex in the air (or at temperatures between 300 ~ 400, inert atmosphere). Requirements of low Tg adhesive, molecular, high strength, good latex properties. Bonding agent is usually 5% wt (the higher the percentage of adhesive, the higher shrinkage after firing).
Inorganic part by the composition of ceramics and glass, usually the ratio of 1:3. The choice depends on the needs of ceramic properties, such as the coefficient of thermal expansion (CTE) and thermal conductivity. Optimization of low-CTE ceramics quartz glass, mullite, cordierite, and zirconia. In order to achieve a higher CTE, preferred ceramic is Al2O3, quartz, olivine and calcium zirconate.
Glass chosen to rely on the required characteristics, such as dielectric constant, adhesion, CTE, and loss tangent values. Glass softening point must be high enough to be completed at the beginning of densification latex, low high-density sintered guarantee. Commonly used plasticizer and Solvent There are two acid and acetone, xylene, methanol and ethanol. Then each component in the paint-like suspension (called glaze) milling and homogenization carried out, pouring onto a moving carrier (usually a polyester film), through a dry area, remove all solvent, by controlling Scraper Clearance, cast into the required thickness, viscosity and set with shrinkage. This process of normal thickness tolerance is ± 6%. Other casting technology can be used for a smaller tolerance.
Figure 1 LTCC typical sintering curve
Then students (not sintered) ceramic with a stainless steel table at the start, cut sheet (slightly larger than red chip size). At 120 for about 30 minutes pretreatment ceramic (or stored in N2 oven 24 hours). Press the pretreatment with red tiles into the final work of health dimensions. Positioning graphics are generated in this process.
Next step is to form a hole, mechanical stamping, drilling or laser drilling techniques to form vias. Health porcelain hole in the holes on the play (usually a diameter of 5 to 8 Mill Mill), used to interconnect circuits on different layers. Even at this stage punching the die to help the lamination time alignment; aligned hole conductor and the media for printing automatically the video aligned.
Followed through-hole filled, using conventional thick film screen printing or extrusion to a special formula of high solids content slurry filling the hole conductor. Programmable CNC punch press can be used to obtain stainless steel or brass template. Slurry through holes filled with students porcelain shrinkage with shrinkage match.
Next step is the use of standard thick-film printing technology for printing and drying conductor paste. Hole filling and conductor graphics box furnace at 120 in the dry for about 5 minutes. According to the needs of all resistors, capacitors and inductors at this stage of printing and drying.
Followed by inspection, sorting and targeting. Inspection, sorting and alignment of different layers, so that each layer in concentric alignment hole and ready to stack. Laminated period (either uniaxial or isostatic), organize and align the substrate layers are hot together (usually 70, 3000psi under 10 minutes). Then step cofired laminated. 200 ~ 500 known as the area between the organic latex area (proposed laminated insulation in this area at least 60 minutes). And then 5 minutes to 15 minutes will be laminated were very badly burned peak temperature (usually 850 ). Atmosphere of a typical row of burned metal and plastic sintering curve will spend 2 hours to 10 hours, shown in Figure 1.
Firing components ready sintering process, such as in the top surface of printed conductors and precision resistors, and then fired in the air. If Cu for metal, sintering must be carried out in N2 furnace chain. Then the circuit trimming (if needed), testing, slicing and testing. LTCC package available brazing wire or heat sinks (if required). At this stage, packaged ready for follow-up process, as shown below.
Tape Tape section pre Layer 1 Punching punching holes filled printing conductor inspection / verification / alignment Stack firing / sintering process after co-firing slice Electric Test
Multi-layer technology, it is necessary to repeat step 6 to step 10.
4 LTCC material properties 4.1 students with materials, ceramic
Health ceramic LTCC systems with a main component of identifying key performance, including the dielectric constant, loss factor, insulation resistance, breakdown voltage, bending strength, CTE and thermal conductivity.
4.2 conductor
Conductor paste screen printing form part of the circuit conductors. Particle size, particle size distribution in determining the organization and the final firing conductors and physical properties of the electrical properties plays an important role. Select the appropriate metallization depends on a combination of various factors, such as resistivity, solderability, wire bonding force, and the system's compatibility with other components, use (through-hole filling, welding, ground floor), electron mobility, attenuation, RF performance, thermal conductivity, current-carrying capacity, adhesion
About the Author
I am a professional writer from Cheap On Sales, which contains a great deal of information about emu oil wrinkles, alpha lipoic acid lotion, welcome to visit!