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PCB新聞 - PCB可靠性的幾個特點

PCB新聞

PCB新聞 - PCB可靠性的幾個特點

PCB可靠性的幾個特點

2021-09-21
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Author:Aure

PCB可靠性的幾個特點


乍一看, 這個 PCB電路板 無論質量如何,外觀都一樣. 只有通過外表,我們才能看到差异, 這些差异對於PCB在整個使用壽命中的耐久性和功能至關重要. 無論是在生產裝配過程中還是在實踐中, PCB必須具有可靠的功能, 這非常重要. 除相關成本外, PCB可能會將裝配過程中的缺陷帶入最終產品中, 在實際應用過程中可能出現故障, 導致索賠. 因此, 從這個角度來看, 可以毫不誇張地說,高品質PCB的成本可以忽略不計. 在所有細分市場, 尤其是那些在關鍵應用領域生產產品的公司, 這種失敗的後果是無法想像的. 在比較PCB價格時,應牢記這些方面. 雖然一個可靠的, 放心, 長壽命產品高, 從長遠來看,這仍然是值得的. 讓我們看看高可靠性的14.個最重要的特性 電路板s:

1、25.微米孔壁銅厚度

優勢:

提高可靠性, 包括提高z軸抗溶脹性的能力.
The dangers of not doing this:
Hole blowing or degassing, electrical connectivity problems in 這個 assembly process (inner layer separation, hole wall fracture), 或在實際使用過程中,在負載條件下可能出現問題. IPCClass2 (the norm used by most factories) rules copper plating to be 20% less.

2、無焊修或開路修線修

優勢:
完善的電路能保證可靠性和安全性, 無需維修, no danger
The danger of not doing so
If the correction is improper, the 電路板 將被破壞. 即使更正是適當的, under load conditions (oscillations, 等.) there will be a risk of mal作用, 然後在實踐中可能發生故障.




PCB可靠性的幾個特點



3、超過IPC規範的清潔度要求

advantage
Improving the cleanliness of PCB印製板 可以提高可靠性.
The danger of not doing so
Residues and solder accumulation on the 電路板 會給阻焊板帶來危險. 離子殘留物會導致焊接表面腐蝕和污染, and then may cause reliability problems (bad solder joints/electrical problems), 並最終添加實際問題. 可能性.
4. Strictly control the service life of each appearance treatment
advantage
Solderability, reliability, and reduce the risk of moisture invasion
The danger of not doing so
Because the surface treatment of old 電路板s將發生金相變化, 可能出現焊接問題, 水分侵蝕可能導致分層等問題, inner layer and hole wall separation (open circuit) during the assembly process and/或實際應用. .
5. Use world-famous substrates-do not use "local" or do not know the brand
advantage
Improved reliability and known functions
The danger of not doing so
Poor mechanical performance means that the 電路板 無法在程式集條件下執行其預期功能. 例如, 高膨脹功能可能導致分層, 斷開和翹曲問題. 電力特性减弱可能導致阻抗效能不佳.
6. 覆銅板的公共服務符合IPC4011CLASSB的要求/L
advantage
Strictly controlling the thickness of the dielectric layer can reduce the error of the expected value of the electrical function.
The danger of not doing so
Electrical functions may not meet the requirements of the rules, 同一批次的組件產量差異較大/function.
7. Define solder mask 材料 to ensure compliance with IPC-SM-840ClassT requirements
advantage
"Excellent" ink, 完成油墨安全, 確保阻焊油墨符合UL規範.
The danger of not doing so
Inferior inks can cause adhesion, 磁通電阻, 和硬度問題. 所有這些問題都會導致阻焊板與 電路板, 最終導致銅線腐蝕. 由於意外的電力連續性,絕緣效能不足可能導致短路/弧.
8. 定義形狀, holes and other mechanical features of the public service
advantage
Strict control of public service can improve the scale and quality of products-improve cooperation, appearance and function
The danger of not doing so
Problems in the assembly process, 例如對齊/cooperation (the problem of pressing the needle will only be discovered when the assembly is completed). 此外, 因為尺寸誤差增大, 安裝底座會有問題.
9. 焊接掩模厚度要求, although IPC has no relevant rules
advantage
Improve the electrical insulation characteristics, 降低脫落或失去附著力的風險, 無論在何處發生機械衝擊,都能增强抵抗機械衝擊的能力!
The danger of not doing so
Thin solder mask can cause adhesion, 磁通電阻和硬度問題. 所有這些問題都會導致阻焊板與 電路板, 最終導致銅線腐蝕. 由於阻焊層很薄, 絕緣特性不足, 由於意外傳導可能導致短路/弧.
10. 定義了外觀要求和維修要求, although IPC does not define
advantage
Careful care and careful care during the production process ensure safety.
The danger of not doing so
A variety of scratches, 輕傷,輕傷, 修理和修理 電路板 可使用但不美觀. 除了從外部可以看到的問題之外, 什麼是無形的危險, 對組件的影響, 以及實際使用中的危險?
11. Requirements for the depth of the plug hole
advantage
High-quality plug holes will reduce the risk of failure in the assembly process.
The danger of not doing so
The chemical residues in the gold-immersion process can remain in the hole that is not full of the plug hole, 然後會導致諸如可焊性之類的問題. 此外, 錫珠可能隱藏在孔中. 裝配或實際使用中, 錫珠可能飛濺並形成短路.

12、指定可剝離藍色膠水的品牌和類型

advantage
The designation of peelable blue glue prevents the use of "local" or cheap brands.
The danger of not doing so
Inferior or cheap peelable glue may foam, 熔化, 裝配過程中混凝土開裂或凝固, 然後使可剝離的膠水無法剝離/不工作.
13. Perform specific approval and ordering procedures for each acquisition order
advantage
The implementation of this procedure can ensure that all specifications are now recognized.
The danger of not doing so
If the product specifications are not carefully recognized, 在裝配或最終產品之前,可能無法發現由此產生的錯誤, 那就太晚了.
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