發(fā)布時間：2018-09-10 13:40

【摘要】：本課題通過陰極電弧離子鍍方法在硬質合金基體表面制備TiAlSiN納米復合涂層,同時沉積TiN、TiAlN兩種納微米薄膜進行對比。通過劃痕法測量其膜基結合強度,并測量其厚度、硬度、摩擦系數(shù)等力學性能;在高溫電阻爐內(nèi)進行氧化實驗,分析涂層的氧化變化及抗氧化機制,結合理論分析了 Al、Si含量的作用;同時利用現(xiàn)場切削實驗,研究了三種涂層銑刀以及無涂層銑刀在銑削過程中的氧化磨損及失效,研究高速切削過程中高溫對TiAlSiN納米復合涂層的影響。主要有以下結論:(1)通過陰極電弧離子鍍在YG-10硬質合金表面制備TiAlSiN復合涂層,涂層表面致密、均勻、光潔度好。通過與TiN、TiAlN涂層進行對比,TiAlSiN復合涂層的顯微硬度最高,達到3800HV0.05,厚度適中為3.45μm,摩擦系數(shù)0.3,結合強度為42N (最大臨界載荷值),達到工業(yè)應用標準HF-1級。(2) TiAlSiN 涂層經(jīng)過 400℃、600℃、800℃、1000℃的高溫退火,與 TiN、TiAlN納微米薄膜進行對比。其中TiN最高抗氧化溫度為600℃,表面形成大量白點有剝落現(xiàn)象,其生成TiO2氧化物不具備保護作用,涂層容易失效;TiAlN涂層的最高抗氧化溫度在800℃,其失效形式與TiN涂層不同,其高溫形成Al2O3氧化物致密,可以阻礙基體進一步被氧化,溫度越高,表面裂紋加劇,涂層更多的是應力集中破壞;TiAlSiN的抗氧化性能最好,涂層氧化過程中氧化物顏色會有變化,形成了 Al2O3、SiO2、TiO2等多種氧化物,1000℃后基體嚴重變形,涂層脫落。(3)通過現(xiàn)場切削實驗,從切削速度、磨損帶寬及磨損率來評估其高速環(huán)境下的使用情況,TiAlSiN涂層切削最平穩(wěn),加工時間最長,TiAlSiN涂層的平均磨損值為0.1895,低于TiN、TiAlN涂層刀具。涂層中添加Al、Si,明顯提高了刀具的耐磨特性、紅硬性,減緩了刀體在高速切削過程的高溫磨損。
[Abstract]:In this paper, TiAlSiN nanocomposite coatings were prepared on cemented carbide substrate by cathodic arc ion plating, and two TiN,TiAlN nanometer-thin films were deposited at the same time. The mechanical properties such as thickness, hardness and friction coefficient were measured by scratch method. Oxidation experiments were carried out in a high temperature resistance furnace to analyze the oxidation change and oxidation resistance mechanism of the coating. The function of Al,Si content is analyzed in combination with the theory, and the oxidation wear and failure of three kinds of coated milling cutters and uncoated milling cutters during milling are studied by field cutting experiments. The effect of high temperature on TiAlSiN nanocomposite coating during high speed cutting was studied. The main conclusions are as follows: (1) the YG-10 composite coating is prepared by cathodic arc ion plating on the surface of YG-10 cemented carbide. The coating surface is compact, uniform and smooth. The microhardness of TiAlSiN composite coating is the highest by comparing with TiN,TiAlN coating. It reaches 3800HV0.05, moderate thickness 3.45 渭 m, friction coefficient 0.3, bonding strength 42N (maximum critical load value), and reaches the standard HF-1 grade for industrial application. (2) TiAlSiN coating is annealed at 400 鈩，

本文編號：2234608