SRM772a是美國(guó)國(guó)家標(biāo)準(zhǔn)與技術(shù)研究院（NIST）推出的磁矩標(biāo)準(zhǔn)鎳球，核心用途為校準(zhǔn)振動(dòng)樣品磁力計(jì)等測(cè)量材料磁性能的儀器，為磁性檢測(cè)提供可溯源的標(biāo)準(zhǔn)依據(jù)。該標(biāo)準(zhǔn)品在材料科學(xué)、磁學(xué)檢測(cè)等領(lǐng)域具有不可替代的校準(zhǔn)價(jià)值。

SRM772a 鎳球標(biāo)準(zhǔn)品產(chǎn)品采用純度99.999%的退火鎳絲制備，經(jīng)研磨加工為球體，直徑精準(zhǔn)控制在2.383mm，質(zhì)量為63.16mg。制備過(guò)程中，球體先后經(jīng)丙酮、甲醇超聲清洗，再于1220K干燥氫氣氛圍中退火2小時(shí)，最終形成平均晶粒尺寸約100μm的等軸微觀結(jié)構(gòu)，保障磁性能穩(wěn)定性。

SRM772a 鎳球標(biāo)準(zhǔn)品其核心認(rèn)證值明確：298K、398kA/m（5000Oe）條件下，磁矩認(rèn)證值為3.47mA?m2±0.01mA?m2（3.47emu±0.01emu），不確定度基于ISO及NIST指南計(jì)算，覆蓋因子k=2，對(duì)應(yīng)95%置信水平。在293K-303K、318kA/m-478kA/m范圍內(nèi)，溫度與磁場(chǎng)校正對(duì)不確定度影響微弱，擴(kuò)展范圍后不確定性約加倍。

使用時(shí)需用非磁性鑷子操作，避免劃傷、污染或變形，儲(chǔ)存于專用容器中，遠(yuǎn)離腐蝕性環(huán)境與高溫。SRM772a 鎳球標(biāo)準(zhǔn)品作為權(quán)l(xiāng)威磁矩標(biāo)準(zhǔn)，它不僅是磁力計(jì)日常校準(zhǔn)的基準(zhǔn)，也為新型磁性材料檢測(cè)設(shè)備的研發(fā)與驗(yàn)證提供了精準(zhǔn)參照。

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東莞市百順生物科技有限公司專業(yè)提供SRM772a 鎳球標(biāo)準(zhǔn)品，歡迎咨詢定購(gòu)。