PASTE FOR JOINING, JOINED BODY USING THE SAME, AND PRODUCTION METHOD OF JOINED BODY

• Main Authors: UESUGI TAKAHIKO, TANAKA NAOHIRO
• Format: Patent
• Language: English; Japanese
• Published: 10.03.2022
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; CASTING; CHEMISTRY; DYES; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; PAINTS; PERFORMING OPERATIONS; POLISHES; POWDER METALLURGY; TRANSPORTING; USE OF MATERIALS AS ADHESIVES; WORKING METALLIC POWDER

To provide a paste for joining which has low viscosity, and with which a joined body excellent in coating adaptability, in viscosity stability over time, and in initial and after thermal cycle test joining strength can be formed.SOLUTION: A paste for joining contains metal particles (A) coated with an organic constituent (a), a dispersion medium (B) and a resin (C), and contains 0.015-1.4 mass% of the resin (C). In the metal particles (A), a particle size (d1) corresponding to 1% of cumulative particle diameter distribution is 30-200 nm, a particle size (d50) corresponding to 50% thereof is 100-350 nm, and a particle size (d99) corresponding to 99% thereof is 300-900 nm, an extrapolation ending temperature (Te) of an exothermic peak of the highest temperature side of the metal particles (A) measured by differential thermal analysis is 200-300°C, and when a mass of the metal particles (A) at an extrapolation starting temperature (Ts) of an exothermic peak of the lowest temperature side of the metal particles (A) is set to be 100 mass%, the mass reduction ratio of the metal particles (A) at Te is 0.2-5 mass%.SELECTED DRAWING: Figure 1 【課題】低粘度で塗布適性と経時粘度安定性に優れ、初期および冷熱サイクル試験後の接合強度に優れる接合体を形成できる接合用ペーストを提供すること。【解決手段】有機成分（ａ）により被覆された金属粒子（Ａ）と分散媒（Ｂ）と樹脂（Ｃ）とを含有し、樹脂（Ｃ）を０．０１５～１．４質量％含有し、金属粒子（Ａ）は、積算粒子径分布の１％に対応した粒子径（ｄ１）が３０～２００ｎｍ、５０％に対応した粒子径（ｄ５０）が１００～３５０ｎｍ、９９％に対応した粒子径（ｄ９９）が３００～９００ｎｍであり、示差熱分析により求められる金属粒子（Ａ）の最も高温側の発熱ピークの補外終了温度（Ｔｅ） が２００～３００℃であり、金属粒子（Ａ）の最も低温側の発熱ピークの補外開始温度（Ｔｓ）における金属粒子（Ａ）の質量を１００質量％とした際、Ｔe における金属粒子（Ａ）の質量減少率が０．２～５質量％である接合用ペースト。【選択図】図１